CN118517719B - Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine - Google Patents
Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine Download PDFInfo
- Publication number
- CN118517719B CN118517719B CN202410988553.6A CN202410988553A CN118517719B CN 118517719 B CN118517719 B CN 118517719B CN 202410988553 A CN202410988553 A CN 202410988553A CN 118517719 B CN118517719 B CN 118517719B
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- inner ring
- outer ring
- connecting device
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005474 detonation Methods 0.000 title claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims abstract description 152
- 238000001816 cooling Methods 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000000110 cooling liquid Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 27
- 238000010146 3D printing Methods 0.000 claims description 20
- 238000007639 printing Methods 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 15
- 239000003921 oil Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000000295 fuel oil Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/52—Toroidal combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/60—Support structures; Attaching or mounting means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/10—Additive manufacturing, e.g. 3D printing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a device and a method for connecting an inner ring and an outer ring of a micro-channel of a rotary detonation ram engine, which relate to the fields of rotary detonation engine structures and heat protection, wherein an integral assembly comprises a connecting device body, an outer ring combustion chamber, an inner ring combustion chamber, a connecting support column, an outer ring airtight connecting flange, an inner ring liquid-tight boss, a cooling flow channel and an inner ring inflow channel; the device can be used for the test product of the local reliable connection of the inner ring and the outer ring of the rotary detonation engine and the effective oil supply or cooling of the inner ring, the cooling flow passage can effectively reduce the temperature of the connecting device body, the structure of the device body and the nearby engine parts are protected, and meanwhile, the connection device can realize the convenient assembly and disassembly between the combustion chambers of the inner ring and the outer ring; the preparation method disclosed by the invention can effectively improve the production efficiency of the device and reduce the consumption of resources such as manpower, material resources and the like.
Description
Technical Field
The invention relates to the field of rotary detonation ramjet engine structures and heat protection, in particular to a micro-channel inner and outer ring connecting device of a rotary detonation ramjet engine, a design method and a preparation method.
Background
The rotary detonation ramjet engine combustion chamber needs to form an annular concave combustion chamber, an inner ring and an outer ring are adopted in the structure, the inner ring is in a cantilever state at the moment, and in order to ensure the structural stability of the inner ring, a connection scheme design between the inner ring and the outer ring is needed to be introduced. Firstly, the most direct scheme can consider designing supporting blocks uniformly distributed in the circumferential direction, and combining the supporting blocks with an inner ring entity and an outer ring entity to form an integral piece, but the structure is complex, the processing and the manufacturing are difficult, and the disassembly and the assembly are not convenient for checking the specific condition of an internal combustion runner before and after an actual test, so that the abnormality is inconvenient to check; therefore, the detachable inner and outer ring connecting device structure has the advantages that the integral combustion chamber structure is simplified, the blocking ratio is adjustable, meanwhile, the connecting mode can also directly convey fluid to the inner ring combustion chamber through the internal channel of the connecting device, active cooling or inner side injection in the combustion chamber is realized, and the difficult problems that independent cooling and even fuel injection of the inner ring combustion chamber are difficult to realize can be solved.
In addition, the inner combustion chamber and the outer combustion chamber are all in an environment filled with high-temperature heat flow for a long time to work, and the connecting device between the inner combustion chamber and the outer combustion chamber is not only high-temperature resistant, but also can bear the impact of the heat flow, and the highest temperature can reach more than 1600K. Under such circumstances, if no effective temperature-resistant protection is adopted, as the working time of the combustion chamber is prolonged, the connecting device is likely to be directly burnt through by high-temperature air flow in the flow passage of the combustion chamber to fail, thereby causing leakage of cooling liquid or fuel oil and causing test accidents.
Moreover, if the material selection aspect of the connecting device body is considered, a passive cooling mode is adopted, namely, the material is hard and resistant to high temperature through the temperature resistance of the material, the common metal material is difficult to maintain good metal characteristics in a high-temperature environment when the rotary knock stamping engine works for a long time, and if an alloy or a composite material which can resist very high temperature is selected, the cost of the material is greatly increased, and other physical characteristics are difficult to ensure to meet the use requirements.
Therefore, the invention designs a detachable micro-channel inner and outer ring connecting device suitable for a rotary detonation ramjet engine. The connecting device adopts an active cooling mode, a tiny cooling flow passage penetrates through the whole device, and a novel 3D printing forming manufacturing technology is adopted in a processing and manufacturing mode. The 3D printing forming technology is more excellent in performance than the traditional machining manufacturing mode for components with complex cooling channels and special-shaped structures, so that the cost can be saved, the production efficiency can be improved, and meanwhile, the model design can be simplified reversely. At present, according to the analysis of the prior published data, no patent scheme for designing and preparing the micro-channel-like inner and outer ring connecting device exists at home and abroad.
Disclosure of Invention
The invention designs a micro-channel inner and outer ring connecting device of a rotary detonation ramjet engine, a design method and a preparation method. The device and the method can effectively solve the technical problems of connection coordination of the inner ring combustion chamber and the outer ring combustion chamber and heat insulation of the connecting device body under the long-time high-temperature condition, ensure that the whole combustion chamber model is convenient to detach and check abnormity, save processing cost, improve manufacturing efficiency and realize the reliability and replaceability of the connecting position of the inner ring combustion chamber and the outer ring combustion chamber.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
A micro-channel inner and outer ring connecting device of a rotary detonation ramjet engine is used for connecting an outer ring combustion chamber and an inner ring combustion chamber. The upper end of the connecting device body is connected with the outer ring combustion chamber through an outer ring airtight connecting flange bolt, and the lower end of the connecting device body is extruded and supported with the inner ring combustion chamber through a connecting support column; the inside of the connecting support column is provided with a cooling flow passage and an inner ring inflow passage; the inner ring inflow channel introduces fuel oil or cooling liquid into the inner ring combustion chamber; the connecting support column is a column body with a triangular cross section and a half-key groove shape combined shape, and comprises a cooling flow passage separation rib and a flow passage outer wall, wherein the cooling flow passage separation rib is positioned between the flow passage outer wall and an internal entity of the connecting support column and is also distributed between two adjacent along-path heat exchange flow passages; the cooling flow passage inlet and the cooling flow passage outlet are both arranged on the outer ring airtight connecting flange and are respectively connected with the cooling liquid input pipeline and the cooling liquid output pipeline in a matching way.
The cooling flow passage penetrates through the inside of the connecting device body and comprises a cold flow passage matched with the diameter of a cooling liquid input pipeline, a cold flow converging cavity and a hot flow converging cavity which are respectively connected with an inlet and an outlet of the cooling flow passage and have cold flow converging and redistribution functions, an along-path heat exchange flow passage playing a role in a heat exchange process and a hot flow passage outputting the cooling liquid after heat exchange is finished; the cross sections of the cold flow path and the heat flow path are in a water drop shape and are respectively and directly communicated with the cold flow converging cavity and the heat flow converging cavity, the shapes of the cold flow converging cavity and the heat flow converging cavity are similar to the shape of the outer contour of the cross section of the connecting support column and are respectively communicated with the head and the tail of the along-the-path heat exchange flow path, the distribution path of each along-the-path heat exchange flow path on the cross section of the connecting device is similar to the shape of the outer contour of the cross section of the connecting support column, the cross section of the along-the-path heat exchange flow path closest to the curved surface of the chamfer r of the connecting device body is in a water drop shape, the curved surface can be better cooled, and the rest of the curved surface is round because the water drop shape and the round flow path have better strength condition compared with other shapes; in addition, all designed the chamber spliced pole that converges in the chamber, can prevent to collapse or bulge, in order to satisfy the requirement of 3D printing shaping direction, the axis of each spliced pole all forms 45 angles with the connecting device body horizontal plane.
As a preferable mode, the outer ring airtight connecting flange is provided with a bolt connecting hole, and is connected with the outer ring combustion chamber through a bolt fixing component; the contact position of the outer ring combustion chamber and the outer ring airtight connecting flange is provided with a key groove-shaped annular sealing groove, an airtight high-temperature-resistant graphite sealing ring A is arranged in the groove, and the sealing groove is in direct extrusion contact with the lower surface of the outer ring airtight connecting flange to realize gas sealing, so that the effective gas sealing of the device within 1000K is ensured.
As a preferred mode, an inner ring oil seal boss is arranged on the bottom surface of the connecting support column and forms liquid seal with an annular liquid seal groove on which a liquid-tight high-temperature-resistant graphite seal ring B can be installed on the inner ring combustion chamber, so that the device can be effectively sealed within 1000K.
Preferably, the upper surface of the outer ring airtight connecting flange is provided with an inner ring inflow channel inlet which can be connected with an outlet of an external fuel oil or cooling liquid pipeline, so that the aim of introducing required fluid into the inner ring combustion chamber is fulfilled.
Preferably, the connecting support column is provided with an inner ring inflow channel outlet at the bottom surface, and is directly communicated with the inflow port of the inner ring combustion chamber.
As a preferred mode, the connecting clearance c is formed between the outer wall surface of the connecting support column and the installation side avoiding surface of the connecting device on the outer ring combustion chamber, and under the action of the airtight high-temperature-resistant graphite sealing ring A, the self-adaptive dynamic sealing during impact load generation in the test process can be ensured, and the connecting device body is protected from being damaged due to overlarge shearing force under the impact load.
As a preferred mode, the outer ring combustion chamber and the inner ring combustion chamber are cylindrical and are connected through K connecting devices which are uniformly distributed along the circumferential direction, and the K value is designed according to the required supporting force between the inner ring combustion chamber and the outer ring combustion chamber and the requirement of meeting the blocking ratio of the combustion flow channel; the required supporting force between the inner ring combustion chamber and the outer ring combustion chamber is set to be F Total (S) , the supporting force provided by a single connecting device is multiplied by a certain safety coefficient to be F i, then F Total (S) ≤K×Fi is required to be met, K is larger than or equal to F Total (S) /Fi, in addition, the inner flow channel blocking ratio is set to be not larger than P according to the test working condition, the blocking area of the inner flow channel cross section of the single connecting device is set to be E i, the whole area of the inner flow channel is set to be E Total (S) , then P is required to be larger than or equal to (KXE i)/E Total (S) , K is smaller than or equal to (P XE Total (S) )/Ei), and the value of K can be obtained by taking the intersection of two inequalities.
As a preferred mode, the inner ring combustion chamber is firstly inserted into the outer ring combustion chamber along the axial direction in the assembly mode, the axis of the combustion chamber can be vertically arranged for installation, then the connecting devices which are uniformly arranged in the circumferential direction are connected with the outer ring combustion chamber through the outer ring airtight connecting flange bolts, and meanwhile, the connecting support columns are connected with the inner ring combustion chamber to squeeze and support the inner ring combustion chamber so as to ensure the coaxiality of the outer ring combustion chamber and the inner ring combustion chamber, thereby realizing installation.
The invention also provides a design method of the micro-channel inner and outer ring connecting device of the rotary detonation ramjet engine, which comprises the following steps:
s1: determining the structure of a connecting device body: the connecting device body comprises an outer ring airtight connecting flange, a connecting support column, an inner ring oil seal boss, a cooling flow passage and an inner ring inflow passage;
S2: determining the structural parameters of an outer ring airtight connecting flange of the connecting device: according to the incoming flow temperature condition of the outer ring combustion chamber, converting the heat productivity of the combustion chamber when the combustion chamber works at the design position of the connecting device, and determining the equivalent diameter d 2 of the cooling flow passage inlet on the outer ring airtight connecting flange and the welding countersink diameter d 1 of the corresponding socket welding of the cooling liquid input pipeline and the cooling flow passage inlet; the outlet size of the cooling flow channel is the same as the equivalent diameter d 2 of the inlet of the cooling flow channel, so that the smooth circulation of the cooling liquid is ensured without restriction; the shape and thickness dimension of the flange are designed according to the overall dimensions of the inner ring combustion chamber and the outer ring combustion chamber and the weight load of the used materials; the compression amount of the airtight high-temperature-resistant graphite sealing ring A is designed according to national standards;
S3: determining structural parameters of a connection support column of the connection device: the cross section of the connecting support column is in a combination shape of an isosceles triangle and a half key groove, and the vertex angle theta of the triangle adopts a form of a small rounded angle r, so that the incoming flow resistance can be reduced, and the local part is prevented from being burnt out due to too thin part; the overall cross section dimension B and the cross section length dimension L of the connecting support column are designed according to the required support strength delta and the required blockage ratio between the inner ring combustion chamber and the outer ring combustion chamber; the length dimension L 3 of the connecting support column is designed in a matching way according to the circumferential dimensions of the inner ring combustion chamber and the outer ring combustion chamber;
S4: determining structural parameters of an inner ring oil seal boss of the connecting device: the inner ring oil seal boss is designed according to the dimension of the equivalent diameter D of the cross section of the inner ring inflow channel, and is guaranteed to be matched with an annular liquid-tight seal groove on the inner ring combustion chamber; the compression amount of the liquid-tight high-temperature-resistant graphite sealing ring B is designed according to national standards;
S5: determining structural parameters of a cooling flow channel of the connecting device: the cold flow path and the hot flow path are respectively matched with the inner diameters of the cooling liquid input pipeline and the cooling liquid output pipeline and are equal to the equivalent diameter d 2; diameter of each along-the-path heat exchange flow path Wherein d 2 is the equivalent diameter of a cooling liquid inlet and outlet, N is the total number of the along-path heat exchange flow paths, and the number of the along-path heat exchange flow paths must ensure that the space s 1 between any two adjacent flow paths is not less than 1mm; furthermore, each flow path must be secured at a distance s 2 from the outer surface of the connection support post of not less than 1.2mm; the cross section of the distribution path of the along-path heat exchange flow path is formed by combining a left isosceles triangle and a right half-key groove, and the bottom edge of the isosceles triangle is overlapped with the width direction of the half-key groove; wherein the length direction length of the half key grooveIsosceles triangle waist long pressConversion shows that theta is the vertex angle of the isosceles triangle, and the whole distribution path is distant from the outer surface of the connecting support column; In the width directionIn the formula, n is the number of the most along-path heat exchange flow paths which can be arranged in the length direction of the half key groove according to the cooling flow channel arrangement principle, D 3 is the diameter of a single along-path heat exchange flow path, and D is the equivalent diameter of the cross section of the inner ring inflow channel; defining s 3 as the inner wall thickness of the flow channel, representing the minimum distance between all cooling flow channels and all channels in the connecting support column, and ensuring that s 3 is not less than 1mm; the areas of the cross sectional areas of the cold flow converging cavity and the hot flow converging cavity after the area occupied by the converging cavity reinforcing column is defined as S Cold water and S Heat of the body respectively, then S Cold water and S Heat of the body are respectively larger than the equivalent circulation diameters of the cold flow path and the hot flow path, and the heights L 1 of the cold flow converging cavity and the hot flow converging cavity are not smaller than 1.5 times of the diameter d 3 of the single along-path heat exchange flow path; in addition, L 2 is the length dimension of the along-the-way heat exchange flow path, and is converted according to the length dimension L 3 of the connecting support column, the height dimension L 1 of the cold and hot flow converging cavity and the minimum distance between the cold and hot flow converging cavity and the upper and lower outer surfaces of the device body;
S6: determining the structural parameters of an inner ring inflow channel of the connecting device: the cross section of the inner ring inflow channel is in a drop shape, 3D printing and forming are facilitated, the whole inner ring inflow channel is columnar, the equivalent diameter D of the cross section of the channel is equal to the inner diameter of the inner ring inflow pipeline, and the size of the inner ring inflow channel is determined by the flow of fuel oil or cooling liquid required by the inner ring combustion chamber.
The invention also provides a preparation method of the micro-channel inner and outer ring connecting device of the rotary detonation ramjet engine, which comprises the following steps:
s1: material preparation and equipment selection: preparing a 3D printing molding metal powder raw material, wherein the preparation comprises the specific brands and unit numbers of the material, and firstly, carrying out relevant detection and drying on the raw material; secondly, selecting 3D printing forming equipment and substrate specifications according to the overall appearance maximum size of the connecting device, and ensuring that the equipment forming scale range is larger than the appearance limit scale of the device;
S2: pretreatment of printing: finishing operations of adding allowance, fixing support and printing support on the connecting device model by utilizing three-dimensional design software, then leading in software to start processing of repairing, placing and slicing before printing, and finally generating a forming program;
S3: checking and adjusting: the use states of the powder paving barrel, the protective mirror and the scraper component of the inspection equipment are abnormal and need to be adjusted or replaced firstly;
S4: and (3) setting forming parameters:
Firstly, before sintering, the oxygen content in a forming bin needs to be reduced to below 900PPM, and then sintering is carried out layer by layer; then setting printing parameters, specifically comprising: scanning interval is 0.06-0.12 mm, powder thickness is 0.05mm, outer contour speed is 200-500 mm/s, inner contour speed is 500-1000 mm/s, and entity speed is 600-1200 mm/s; finally, formally starting 3D printing and forming of the connecting device, simultaneously carrying out furnace-following printing of a sample piece, and carrying out a mechanical property test, so that the mechanical property and the forming quality of a formed connecting device material object can be monitored;
s5: post-printing treatment: finishing model post-treatment and detection procedures of powder cleaning, CT detection, X-ray detection and heat treatment after 3D printing and forming of the connecting device;
S6: machining: and (3) carrying out final machining treatment on the connecting device to finish bolt holes, welding countersunk holes of all pipelines and local chamfering.
Compared with the prior art, the connecting device and the design method and the preparation method thereof provided by the invention have the following beneficial effects:
The specific condition of the internal combustion flow channel is not convenient to disassemble, assemble and check before and after the actual test, and the abnormality is not convenient to check; meanwhile, the connecting mode can also directly convey fluid to the inner ring combustion chamber through the internal channel of the connecting device, so that independent active cooling or inner side oil injection in the combustion chamber can be realized.
(1) The device has simple and reliable structure, can realize the rapid disassembly and abnormality investigation of the whole combustion chamber connecting structure, and can realize the adjustable blocking ratio according to different width sizes and quantity schemes;
(2) The cooling flow channels are uniformly and densely arranged in the device, so that the cooling flow channels can play an effective role in cooling and protecting in long-time high-temperature operation in the flow channels of the combustion chamber of the rotary detonation ramjet engine, smooth combustion of the engine is ensured, and the influence of excessive heat conduction on the normal operation of other components of the engine is avoided;
(3) The device realizes the aims that the inner annular combustion chamber can independently finish internal active cooling and uniform fuel injection through the designed inflow channel;
(4) The preparation method of the device reduces the processing and manufacturing difficulty and greatly shortens the production time, thereby reducing the cost.
Drawings
FIG. 1 is a schematic view of the overall three-dimensional assembly of the inner and outer ring connection of the present invention with a combustion chamber;
FIG. 2 is an exploded view of the overall assembly of the inner and outer ring connection of the present invention with a combustion chamber;
FIG. 3 is a schematic view of a partial cross-sectional structure of a connecting device body according to the present invention;
FIG. 4 is a schematic view of the structure of the airtight connecting flange of the outer ring of the connecting device of the present invention;
FIG. 5 is a schematic cross-sectional view of a connector body of the present invention and a two-dimensional schematic;
FIG. 6 is a schematic cross-sectional view of a connecting support column of the connecting device of the present invention.
FIG. 7 is a schematic diagram showing the whole extraction of the cooling flow passage inside the connecting device according to the present invention.
Reference numerals illustrate: the cooling device comprises a 1-outer ring airtight connecting flange, a 2-connecting support column, a 3-inner ring oil seal boss, a 4-cooling flow passage, a 5-inner ring inflow passage, a 001-bolt fixing assembly, a 002-airtight high temperature resistant graphite sealing ring A, a 003-outer ring combustion chamber, a 004-liquid-tight high temperature resistant graphite sealing ring B, a 005-inner ring combustion chamber, a 006-inner ring inflow pipeline, a 007-cooling liquid input pipeline, a 008-cooling liquid output pipeline, a 101-cooling flow passage inlet, a 102-cooling flow passage outlet, a 103-inner ring inflow passage inlet, a 104-bolt connecting hole, a 201-cooling flow passage spacer, a 202-flow passage outer wall, a 203-converging cavity reinforcing column, a 204-inner ring inflow passage outlet, a 401-cold flow passage, a 402-cold flow converging cavity, a 403-along-heat exchange flow passage, a 404-heat flow converging cavity and a 405-heat flow passage.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Example 1
As shown in fig. 1, the micro-channel inner and outer ring connecting device of the rotary detonation ramjet engine provided by the embodiment is used for connecting an outer ring combustion chamber 003 and an inner ring combustion chamber 005,
The upper end of the connecting device body is connected with the outer ring combustion chamber 003 through an outer ring airtight connecting flange 1 through bolts, and the lower end of the connecting device body is extruded and supported with the inner ring combustion chamber 005 through a connecting support column 2; a cooling flow passage 4 and an inner ring inflow passage 5 are arranged in the connecting support column 2; the inner annular inflow channel 5 may introduce fuel or coolant to the inner annular combustion chamber 005; the connecting support column 2 is a column body with a triangular cross section and a half-key groove shape combined shape, and comprises a cooling flow passage separation rib 201 and a flow passage outer wall 202, wherein the cooling flow passage separation rib 201 is positioned between the flow passage outer wall 202 and an internal entity of the connecting support column 2 and is also distributed between two adjacent along-path heat exchange flow passages 403; the cooling flow channel inlet 101 and the cooling flow channel outlet 102 are both arranged on the outer ring airtight connecting flange 1 and are respectively connected with the cooling liquid input pipeline 007 and the cooling liquid output pipeline 008 in a matching way, and the cooling flow channel outlet 102 can ensure the circulation of heat flow and timely take away heat, so that the active cooling of the connecting device body is realized.
The cooling flow channel 4 penetrates through the inside of the connecting device body and comprises a cold flow channel 401 matched with the diameter of a cooling liquid input pipeline 007, a cold flow converging cavity 402 and a hot flow converging cavity 404 which are respectively connected with the inlet and the outlet of the cooling flow channel and have cold flow converging and redistribution functions, a along-path heat exchange flow channel 403 which plays a role in most heat exchange processes, and a hot flow channel 405 which outputs the cooling liquid after heat exchange; the cross sections of the cold flow path 401 and the hot flow path 405 are in a water drop shape and are respectively and directly communicated with the cold flow converging cavity 402 and the hot flow converging cavity 404, the shapes of the two converging cavities are similar to the shape of the outer contour of the cross section of the connecting support column 2 and are respectively communicated with the head and the tail of the along-the-path heat exchange flow path 403, the distribution path of each along-the-path heat exchange flow path 403 on the cross section of the connecting device is similar to the shape of the outer contour of the cross section of the connecting support column 2, the cross section of the along-path heat exchange flow path 403 closest to the curved surface of the chamfer r of the connecting device body is in a water drop shape, the cross section of the other along-path heat exchange flow paths 403 is round, and the water drop shape and the round flow path have better strength conditions compared with other shapes; in addition, all designed the chamber that converges in the chamber and strengthened post 203, can prevent to collapse or bulge, in order to satisfy the requirement of 3D printing shaping direction, the axis of each strengthening post all designs to become 45 angles with the connecting device body horizontal plane.
The outer ring airtight connecting flange 1 is provided with a bolt connecting hole 104 which is connected with the outer ring combustion chamber 003 through a bolt fixing assembly 001; the contact position of the outer ring combustion chamber 003 and the outer ring airtight connecting flange 1 is provided with a key groove-shaped annular sealing groove, an airtight high-temperature-resistant graphite sealing ring A002 is arranged in the groove, and the sealing groove is in direct extrusion contact with the lower surface of the outer ring airtight connecting flange 1 to realize gas sealing, so that the air tightness of the outer ring combustion chamber runner is ensured.
An inner ring oil seal boss 3 is arranged on the bottom surface of the connecting support column 2 and forms liquid seal with an annular liquid seal groove on which a liquid-tight high-temperature-resistant graphite seal ring B004 can be arranged on the inner ring combustion chamber 005, so that the liquid tightness of an inlet of the inner ring combustion chamber is ensured.
The upper surface of the outer ring airtight connecting flange 1 is provided with an inner ring inflow channel inlet 103 which can be connected with an outlet of an external fuel oil or cooling liquid pipeline, thereby achieving the purpose of introducing required fluid into the inner ring combustion chamber 005.
The connection support column 2 is provided with an inner ring inflow channel outlet 204 at the bottom surface, and is directly communicated with the inflow port of the inner ring combustion chamber 005.
The connecting support column 2 outer wall surface is provided with the connection clearance c with the connecting device installation side on the outer ring combustion chamber 003 and keeps away the face, under the cooperation airtight high temperature resistant graphite sealing washer A002 effect, can guarantee the self-adaptation dynamic seal when producing impact load in the test process and protect the connecting device body can not receive the shearing force too big and destroy because of impact load. The gap c can be designed according to the size of the inner combustion chamber and the outer combustion chamber and the impact load in the test process, so that the stress calculation and analysis of the connecting device body under the dynamic load are needed.
The outer ring combustion chamber 003 and the inner ring combustion chamber 005 are cylindrical and are connected through K connecting devices which are uniformly distributed along the circumferential direction, and the K value is designed according to the required supporting force between the inner ring combustion chamber 005 and the outer ring combustion chamber 003 and the requirement of meeting the blocking ratio of a combustion flow passage; the required supporting force between the inner ring combustion chamber and the outer ring combustion chamber is set to be F Total (S) , the supporting force provided by a single connecting device is multiplied by a certain safety coefficient to be F i, then F Total (S) ≤K×Fi is required to be met, K is larger than or equal to F Total (S) /Fi, in addition, the inner flow channel blocking ratio is set to be not larger than P according to the test working condition, the blocking area of the inner flow channel cross section of the single connecting device is set to be E i, the whole area of the inner flow channel is set to be E Total (S) , then P is required to be larger than or equal to (KXE i)/E Total (S) , K is smaller than or equal to (P XE Total (S) )/Ei), and the value of K can be obtained by taking the intersection of two inequalities.
The assembly mode is that the inner ring combustion chamber 005 is firstly inserted into the outer ring combustion chamber 003 along the axial direction, the combustion chamber axis can be vertically placed for convenient installation, then the connecting devices which are uniformly arranged in the circumferential direction are connected with the outer ring combustion chamber 003 through the outer ring airtight connecting flange 1, and meanwhile, the connecting support columns 2 are connected with the inner ring combustion chamber 005 in a pressing mode to ensure the coaxiality of the outer ring combustion chamber 003 and the inner ring combustion chamber 005, so that installation is realized.
Example 2
The design method of the micro-channel inner and outer ring connecting device of the rotary detonation ramjet engine provided by the embodiment of the invention comprises the following steps:
S1: determining the structure of a connecting device body: the connecting device body comprises five structures, namely an outer ring airtight connecting flange 1, a connecting support column 2, an inner ring oil seal boss 3, a cooling flow passage 4 and an inner ring inflow passage 5, as shown in figure 3; the device detail size schematic is shown in fig. 5.
S2: determining the structural parameters of the outer ring airtight connecting flange 1 of the connecting device: according to the incoming flow temperature condition of the outer ring combustion chamber 003, converting the heat productivity of the combustion chamber when working at the design position of the connecting device, and determining the equivalent diameter d 2 of the cooling flow channel inlet 101 and the welding countersink diameter d 1 of the corresponding socket welding of the cooling flow channel inlet 101 and the cooling liquid input pipeline 007 on the outer ring airtight connecting flange 1; the size of the cooling flow passage outlet 102 is the same as the equivalent diameter d 2 of the cooling flow passage inlet 101, so that the smooth circulation of the cooling liquid is ensured without restriction; the shape and thickness dimensions of the flange are designed according to the overall dimensions of the inner annular combustion chamber 005 and the outer annular combustion chamber 003 and the weight load of the materials used; the compression amount of the airtight high-temperature-resistant graphite sealing ring A002 is designed according to national standards;
S3: determining structural parameters of the connecting support column 2 of the connecting device: the cross section of the connecting support column 2 is in a combination shape of an isosceles triangle and a half key groove, and the vertex angle theta of the triangle adopts a form of a small round angle r, so that the incoming flow resistance can be reduced, and the local too thin part is prevented from being burnt out; the overall cross-sectional dimension B of the connection support post 2 and the connection support post cross-sectional length dimension L are designed according to the required support strength δ and the required blockage ratio between the inner annular combustion chamber 005 and the outer annular combustion chamber 003; the length dimension L 3 of the connecting support column 2 is designed in a matching way according to the circumferential dimensions of the inner annular combustion chamber 005 and the outer annular combustion chamber 003; for the requirements of supporting strength and incoming flow blocking ratio, the strength and blocking ratio coupling calculation analysis is required to be carried out on the connecting device body;
S4: determining structural parameters of an inner ring oil seal boss 3 of the connecting device: the inner ring oil seal boss 3 is designed according to the dimension of the equivalent diameter D of the cross section of the inner ring inflow channel 5, and is ensured to be matched with an annular liquid seal groove on the inner ring combustion chamber 005; the compression amount of the liquid-tight high-temperature-resistant graphite sealing ring B004 is designed according to national standards;
S5: determining the structural parameters of the cooling flow channel 4 of the connecting device: the cooling liquid cold flow path 401 and the hot flow path 405 are respectively matched with the inner diameters of the cooling liquid input pipeline 007 and the cooling liquid output pipeline 008 and are equal to the equivalent diameter d 2; diameter of each of the along-the-path heat exchange flow paths 403 Wherein d 2 is the equivalent diameter of a cooling liquid inlet and outlet, N is the total number of the along-path heat exchange flow paths 403, and the number of the along-path heat exchange flow paths 403 must ensure that the space s 1 between any two adjacent flow paths is not less than 1mm; furthermore, each flow path must be ensured to be no less than 1.2mm from the outer surface s 2 of the connection support column 2; the cross section of the distribution path along the heat exchange flow path 403 is formed by combining a left isosceles triangle and a right half key groove, and the bottom edge of the isosceles triangle is overlapped with the width direction of the half key groove; wherein the length direction length of the half key grooveIsosceles triangle waist length can be pressedConversion shows that theta is the vertex angle of the isosceles triangle, and the whole distribution path is distant from the outer surface of the connecting support column 2; In the width directionIn the formula, n is the number of the most along-path heat exchange flow paths 403 which can be arranged in the length direction of the half key groove according to the arrangement principle of the cooling flow channels 4, D 3 is the diameter of a single along-path heat exchange flow path 403, and D is the equivalent diameter of the cross section of the inner ring inflow channel 5; defining s 3 as the inner wall thickness of the flow channel, representing the minimum distance between all cooling flow channels and all channels in the connecting support column 2, and ensuring that s 3 is not less than 1mm; the areas of the cold flow converging cavity 402 and the hot flow converging cavity 404 after the cross sectional areas of the converging cavity reinforcing columns 203 are removed are defined as S Cold water and S Heat of the body respectively, so that S Cold water and S Heat of the body are required to be respectively larger than the equivalent circulation diameters of the cold flow path 401 and the hot flow path 405, and the heights L 1 of the two converging cavities are not smaller than 1.5 times the diameter d 3 of a single along-path heat exchange path 403; in addition, L 2 is the length dimension of the along-the-way heat exchange flow path 403, and can be converted according to the length dimension L 3 of the connecting support column 2, the height dimension L 1 of the cold and hot flow converging cavity, and the minimum distance between the cold and hot flow converging cavity and the upper and lower outer surfaces of the device body; in order to ensure that the design of the cooling flow channel 4 meets the requirements, the heat exchange efficiency of the connecting device body is calculated and analyzed;
S6: determining the structural parameters of an inner ring inflow channel 5 of the connecting device: the cross section of the inner ring inflow channel 5 is in a drop shape, so that 3D printing and forming are facilitated, the whole channel is columnar, the equivalent diameter D of the cross section of the channel is equal to the inner diameter of the inner ring inflow pipeline, and the size of the channel is determined by the flow of fuel oil or cooling liquid required by the inner ring combustion chamber;
Example 3
The preparation method of the micro-channel inner and outer ring connecting device of the ramjet engine in the embodiment 1 comprises the following steps:
s1: material preparation and equipment selection: preparing a 3D printing molding metal powder raw material, wherein the preparation comprises the specific brands and unit numbers of the material, and firstly, carrying out relevant detection and drying on the raw material; secondly, selecting 3D printing forming equipment and substrate specifications according to the overall appearance maximum size of the connecting device, and ensuring that the equipment forming scale range is larger than the appearance limit scale of the device;
S2: pretreatment of printing: the method comprises the steps of completing operations such as adding allowance, fixing support, printing support and the like on a connecting device model by utilizing three-dimensional design software, then leading in software to start a series of processes such as repairing, placing, slicing and the like before printing, and finally generating a forming program;
s3: checking and adjusting: the use states of components such as a powder paving barrel, a protective mirror, a scraper and the like of the inspection equipment are abnormal and need to be adjusted or replaced firstly;
S4: and (3) setting forming parameters:
Firstly, before sintering, the oxygen content in a forming bin needs to be reduced to below 900PPM, and then sintering is carried out layer by layer; then setting printing parameters, specifically comprising: scanning interval is 0.06-0.12 mm, powder thickness is 0.05mm, outer contour speed is 200-500 mm/s, inner contour speed is 500-1000 mm/s, and entity speed is 600-1200 mm/s; finally, formally starting 3D printing and forming of the connecting device, simultaneously carrying out furnace-following printing of a sample piece, and carrying out a mechanical property test, so that the mechanical property and the forming quality of a formed connecting device material object can be monitored;
S5: post-printing treatment: and finishing model post-treatment and detection procedures such as powder cleaning, CT detection, X-ray detection, heat treatment and the like after the 3D printing and forming of the connecting device.
S6: machining: and (3) carrying out final machining treatment on the connecting device to finish machining of bolt holes, welding countersunk holes of all pipelines, local chamfering and the like.
Example 4
This embodiment differs from embodiment 1 in that:
The thickness h of the flange of the connecting device body is 10mm, and the size of the flange is designed by the connection strength between the inner ring combustion chamber and the outer ring combustion chamber; the length dimension L 3 of the body is 38mm according to the circumferential dimension of the inner ring combustion chamber and the outer ring combustion chamber; the cross section size B, L and the angle theta of the body support column are designed according to the required support strength and the required blockage ratio between the inner ring combustion chamber and the outer ring combustion chamber, the length L is 28.5 mm, the width B is 16mm, and the angle theta is 60 degrees; the inner ring oil seal boss 3 at the bottom of the body is 1mm in boss height according to national standard, and the thickness of the boss converted from the clearance between the grooves at the corresponding connection positions of the inner ring combustion chamber is 1.5mm.
The outer ring airtight connecting flange 1 is rectangular with the length of 105mm and the width of 85mm, and four corners are rounded by 5 mm; the bolt connection hole 104 is 11mm, the bolt is selected as an internal hexagonal full-thread bolt of M10, and the length is 25mm according to the thickness of the flange plus the thickness of the spring pad and the flat pad, namely M10 multiplied by 25; the equivalent diameter D of the inlet 103 of the inner ring inflow channel is determined according to the flow of fuel oil or cooling liquid required by the inner ring combustion chamber, wherein D is 6mm; the cooling flow channel inlet 101 and the cooling flow channel outlet 102 are respectively matched with a cooling liquid input pipeline 007 and a cooling liquid output pipeline 008, the equivalent diameter d 2 of the cooling flow channel inlet is selected according to the flow rate of cooling liquid required by active cooling estimated according to the incoming flow temperature of a combustion chamber and the integral scale of a connecting device, and further d 2 is 5mm in consideration of the standard specification of a common stainless steel pipe, and the wall thickness of the steel pipe is 1mm, and d 1 is 8mm;
In terms of the arrangement of the cooling flow passage 4, the flow paths of the cold flow passage 401 and the hot flow passage 405 are equal to the inlet-outlet equivalent diameter d 2 =5 mm. According to the heat exchange analysis of the connecting device at the long-time working temperature of the combustion chamber, taking the distance s 1 between the along-path heat exchange flow paths 403 as 1mm and the distance s 2 from the outer surface of the connecting device body as 1.2mm, calculating the number N of the arrangeable along-path heat exchange flow paths 403 as 32 according to the cross section size of the support column of the connecting device body, wherein the number N of the arrangeable along-path heat exchange flow paths in the length direction is 10, and calculating the inner wall thickness between the along-path heat exchange flow paths 403 and the inner ring inflow channel 5 as 1.8mm according to the equivalent diameter D; then, the calculation formula is satisfied Taking 2mm for d 3 under the condition, the cross-sectional dimension of the distribution path along the heat exchange flow path 403 is: the length of the half key groove satisfies the formulaI.e. L 4 =27 mm, isosceles triangle waist long pressThe distance between the whole distribution path and the outer surface of the connecting device body satisfies the formula after the conversion of L 5 =11.6mmI.e. L 6 =2.2 mm, the width dimensions are such thatI.e., L 7 =11.6mm, at this time, L 7=L5,, i.e., the left end of the cross section of the distribution path along the path heat exchange flow path 403 is an equilateral triangle;
In addition, the whole connecting device model also needs to be subjected to local chamfering design, and then the 3D printing preparation method provided by the invention is used for completing the manufacturing of objects.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims of this invention, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the invention disclosed herein.
Claims (7)
1. The utility model provides a rotatory knocking ramjet microchannel inner and outer ring connecting device for connect outer ring combustion chamber and inner ring combustion chamber, its characterized in that:
The upper end of the connecting device body is connected with the outer ring combustion chamber through an outer ring airtight connecting flange bolt, and the lower end of the connecting device body is extruded and supported with the inner ring combustion chamber through a connecting support column; the inside of the connecting support column is provided with a cooling flow passage and an inner ring inflow passage; the inner ring inflow channel introduces fuel oil or cooling liquid into the inner ring combustion chamber; the connecting support column is a column body with a triangular cross section and a half-key groove shape combined shape, and comprises a cooling flow passage separation rib and a flow passage outer wall, wherein the cooling flow passage separation rib is positioned between the flow passage outer wall and an internal entity of the connecting support column and is also distributed between two adjacent along-path heat exchange flow passages; the cooling flow passage inlet and the cooling flow passage outlet are both arranged on the outer ring airtight connecting flange and are respectively connected with the cooling liquid input pipeline and the cooling liquid output pipeline in a matching way;
An inner ring oil seal boss is arranged on the bottom surface of the connecting support column, and an annular liquid seal groove capable of being provided with a liquid seal high-temperature resistant graphite seal ring B is arranged on the inner ring combustion chamber to form liquid seal, so that the effective liquid seal of the device within 1000K is ensured;
The upper surface of the outer ring airtight connecting flange is provided with an inner ring inflow channel inlet which can be connected with an outlet of an external fuel oil or cooling liquid pipeline, so that the aim of introducing required fluid into the inner ring combustion chamber is fulfilled;
the connecting support column is provided with an inner ring inflow channel outlet at the bottom surface and is directly communicated with the inflow port of the inner ring combustion chamber.
2. The rotary detonation ramjet engine microchannel inner and outer ring connection device of claim 1, wherein: the cooling flow passage penetrates through the inside of the connecting device body and comprises a cold flow passage matched with the diameter of a cooling liquid input pipeline, a cold flow converging cavity and a hot flow converging cavity which are respectively connected with an inlet and an outlet of the cooling flow passage and have cold flow converging and redistribution functions, an along-path heat exchange flow passage playing the role of a heat exchange process and a hot flow passage outputting the cooling liquid after heat exchange; the cross sections of the cold flow path and the hot flow path are in a water drop shape and are respectively and directly communicated with the cold flow converging cavity and the hot flow converging cavity, the shapes of the cold flow converging cavity and the hot flow converging cavity are similar to the shape of the outer contour of the cross section of the connecting support column and are respectively communicated with the head and the tail of the along-the-path heat exchange flow path, the distribution path of each along-the-path heat exchange flow path on the cross section of the connecting device is similar to the shape of the outer contour of the cross section of the connecting support column, the cross section of the along-the-path heat exchange flow path closest to the curved surface of the chamfer r of the connecting device body is in a water drop shape, and the rest of the along-path heat exchange flow path is circular; in addition, all designed the chamber reinforcing column that converges in the chamber that converges, and the axis of each reinforcing column all forms 45 angles with the connecting device body horizontal plane.
3. The rotary detonation ramjet engine microchannel inner and outer ring connection device of claim 1, wherein: the outer ring airtight connecting flange is provided with a bolt connecting hole, and is connected with the outer ring combustion chamber through a bolt fixing assembly; the contact position of the outer ring combustion chamber and the outer ring airtight connecting flange is provided with a key groove-shaped annular sealing groove, an airtight high-temperature-resistant graphite sealing ring A is arranged in the groove, and the sealing groove is in direct extrusion contact with the lower surface of the outer ring airtight connecting flange to realize gas sealing, so that the effective gas sealing of the device within 1000K is ensured.
4. The rotary detonation ramjet engine microchannel inner and outer ring connection device of claim 1, wherein: the connecting clearance c is formed between the outer wall surface of the connecting support column and the installation side avoiding surface of the connecting device on the outer ring combustion chamber, and under the action of the airtight high-temperature-resistant graphite sealing ring A, the self-adaptive dynamic sealing during impact load generation in the test process can be ensured, and the connecting device body is protected from being damaged due to overlarge shearing force under the impact load.
5. The rotary detonation ramjet engine microchannel inner and outer ring connection device of claim 1, wherein: the outer ring combustion chamber and the inner ring combustion chamber are cylindrical and are connected through K connecting devices which are uniformly distributed along the circumferential direction, and the K value is designed according to the required supporting force between the inner ring combustion chamber and the outer ring combustion chamber and the requirement of meeting the blocking ratio of the combustion flow channel; the assembly mode is that the inner ring combustion chamber is firstly inserted into the outer ring combustion chamber along the axial direction, the axis of the combustion chamber can be vertically arranged for being convenient to install, then the connecting device which is circumferentially and uniformly arranged is connected with the outer ring combustion chamber through the outer ring airtight connecting flange bolts, and meanwhile, the connecting support columns are connected with the inner ring combustion chamber in an extrusion supporting mode to ensure the coaxiality of the outer ring combustion chamber and the inner ring combustion chamber, so that the installation is realized.
6. The method for designing a micro-channel inner and outer ring connection device for a rotary detonation ramjet engine according to any one of claims 1 to 5, comprising the steps of:
s1: determining the structure of a connecting device body: the connecting device body comprises an outer ring airtight connecting flange, a connecting support column, an inner ring oil seal boss, a cooling flow passage and an inner ring inflow passage;
S2: determining the structural parameters of an outer ring airtight connecting flange of the connecting device: according to the incoming flow temperature condition of the outer ring combustion chamber, converting the heat productivity of the combustion chamber when the combustion chamber works at the design position of the connecting device, and determining the equivalent diameter d 2 of the cooling flow passage inlet on the outer ring airtight connecting flange and the welding countersink diameter d 1 of the corresponding socket welding of the cooling liquid input pipeline and the cooling flow passage inlet; the outlet size of the cooling flow channel is the same as the equivalent diameter d 2 of the inlet of the cooling flow channel, so that the smooth circulation of the cooling liquid is ensured without restriction; the shape and thickness dimension of the flange are designed according to the overall dimensions of the inner ring combustion chamber and the outer ring combustion chamber and the weight load of the used materials; the compression amount of the airtight high-temperature-resistant graphite sealing ring A is designed according to national standards;
S3: determining structural parameters of a connection support column of the connection device: the cross section of the connecting support column is in a combination shape of an isosceles triangle and a half key groove, and the vertex angle theta of the triangle adopts a form of a small rounded angle r, so that the incoming flow resistance can be reduced, and the local part is prevented from being burnt out due to too thin part; the overall cross section dimension B and the cross section length dimension L of the connecting support column are designed according to the required support strength delta and the required blockage ratio between the inner ring combustion chamber and the outer ring combustion chamber; the length dimension L 3 of the connecting support column is designed in a matching way according to the circumferential dimensions of the inner ring combustion chamber and the outer ring combustion chamber;
S4: determining structural parameters of an inner ring oil seal boss of the connecting device: the inner ring oil seal boss is designed according to the dimension of the equivalent diameter D of the cross section of the inner ring inflow channel, and is guaranteed to be matched with an annular liquid-tight seal groove on the inner ring combustion chamber; the compression amount of the liquid-tight high-temperature-resistant graphite sealing ring B is designed according to national standards;
S5: determining structural parameters of a cooling flow channel of the connecting device: the cold flow path and the hot flow path are respectively matched with the inner diameters of the cooling liquid input pipeline and the cooling liquid output pipeline and are equal to the equivalent diameter d 2; diameter of each along-the-path heat exchange flow path Wherein d 2 is the equivalent diameter of a cooling liquid inlet and outlet, N is the total number of the along-path heat exchange flow paths, and the number of the along-path heat exchange flow paths must ensure that the space s 1 between any two adjacent flow paths is not less than 1mm; furthermore, each flow path must be secured at a distance s 2 from the outer surface of the connection support post of not less than 1.2mm; the cross section of the distribution path of the along-path heat exchange flow path is formed by combining a left isosceles triangle and a right half-key groove, and the bottom edge of the isosceles triangle is overlapped with the width direction of the half-key groove; wherein the length direction length of the half key grooveIsosceles triangle waist long pressConversion shows that theta is the vertex angle of the isosceles triangle, and the whole distribution path is distant from the outer surface of the connecting support column; In the width directionIn the formula, n is the number of the most along-path heat exchange flow paths which can be arranged in the length direction of the half key groove according to the cooling flow channel arrangement principle, D 3 is the diameter of a single along-path heat exchange flow path, and D is the equivalent diameter of the cross section of the inner ring inflow channel; defining s 3 as the inner wall thickness of the flow channel, representing the minimum distance between all cooling flow channels and all channels in the connecting support column, and ensuring that s 3 is not less than 1mm; the areas of the cross sectional areas of the cold flow converging cavity and the hot flow converging cavity after the area occupied by the converging cavity reinforcing column is defined as S Cold water and S Heat of the body respectively, then S Cold water and S Heat of the body are respectively larger than the equivalent circulation diameters of the cold flow path and the hot flow path, and the heights L 1 of the cold flow converging cavity and the hot flow converging cavity are not smaller than 1.5 times of the diameter d 3 of the single along-path heat exchange flow path; in addition, L 2 is the length dimension of the along-the-way heat exchange flow path, and is converted according to the length dimension L 3 of the connecting support column, the height dimension L 1 of the cold and hot flow converging cavity and the minimum distance between the cold and hot flow converging cavity and the upper and lower outer surfaces of the device body;
S6: determining the structural parameters of an inner ring inflow channel of the connecting device: the cross section of the inner ring inflow channel is in a drop shape, 3D printing and forming are facilitated, the whole inner ring inflow channel is columnar, the equivalent diameter D of the cross section of the channel is equal to the inner diameter of the inner ring inflow pipeline, and the size of the inner ring inflow channel is determined by the flow of fuel oil or cooling liquid required by the inner ring combustion chamber.
7. The method for manufacturing the micro-channel inner and outer ring connecting device of the rotary detonation ramjet engine according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s1: material preparation and equipment selection: preparing a 3D printing molding metal powder raw material, wherein the preparation comprises the specific brands and unit numbers of the material, and firstly, carrying out relevant detection and drying on the raw material; secondly, selecting 3D printing forming equipment and substrate specifications according to the overall appearance maximum size of the connecting device, and ensuring that the equipment forming scale range is larger than the appearance limit scale of the device;
S2: pretreatment of printing: finishing operations of adding allowance, fixing support and printing support on the connecting device model by utilizing three-dimensional design software, then leading in software to start processing of repairing, placing and slicing before printing, and finally generating a forming program;
S3: checking and adjusting: the use states of the powder paving barrel, the protective mirror and the scraper component of the inspection equipment are abnormal and need to be adjusted or replaced firstly;
S4: and (3) setting forming parameters:
Firstly, before sintering, the oxygen content in a forming bin needs to be reduced to below 900PPM, and then sintering is carried out layer by layer; then setting printing parameters, specifically comprising: scanning interval is 0.06-0.12 mm, powder thickness is 0.05mm, outer contour speed is 200-500 mm/s, inner contour speed is 500-1000 mm/s, and entity speed is 600-1200 mm/s; finally, formally starting 3D printing and forming of the connecting device, simultaneously carrying out furnace-following printing of a sample piece, and carrying out a mechanical property test, so that the mechanical property and the forming quality of a formed connecting device material object can be monitored;
s5: post-printing treatment: finishing model post-treatment and detection procedures of powder cleaning, CT detection, X-ray detection and heat treatment after 3D printing and forming of the connecting device;
S6: machining: and (3) carrying out final machining treatment on the connecting device to finish bolt holes, welding countersunk holes of all pipelines and local chamfering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410988553.6A CN118517719B (en) | 2024-07-23 | 2024-07-23 | Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410988553.6A CN118517719B (en) | 2024-07-23 | 2024-07-23 | Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118517719A CN118517719A (en) | 2024-08-20 |
| CN118517719B true CN118517719B (en) | 2024-10-01 |
Family
ID=92284341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410988553.6A Active CN118517719B (en) | 2024-07-23 | 2024-07-23 | Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118517719B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036093A (en) * | 2017-06-01 | 2017-08-11 | 华帝股份有限公司 | Three-ring fire burner convenient to disassemble |
| CN116792780A (en) * | 2022-03-16 | 2023-09-22 | 中国航发商用航空发动机有限责任公司 | Oil collecting ring and cooling method thereof, fuel nozzle, combustion chamber and turbine engine |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50108411A (en) * | 1974-02-04 | 1975-08-26 | ||
| US7011047B2 (en) * | 2003-11-20 | 2006-03-14 | United Technologies Corporation | Detonative cleaning apparatus |
| FR2932228B1 (en) * | 2008-06-10 | 2010-07-30 | Mbda France | MOTOR WITH PULSE DETONATIONS. |
| US20110146285A1 (en) * | 2009-12-17 | 2011-06-23 | General Electric Company | Pulse detonation system with fuel lean inlet region |
| US9021783B2 (en) * | 2012-10-12 | 2015-05-05 | United Technologies Corporation | Pulse detonation engine having a scroll ejector attenuator |
| US20160102609A1 (en) * | 2014-10-09 | 2016-04-14 | United Technologies Corporation | Pulse detonation combustor |
| US20170146244A1 (en) * | 2015-11-20 | 2017-05-25 | University Of Washington | Continuous rotating detonation engines and associated systems and methods |
| CN108060979B (en) * | 2017-12-19 | 2024-04-26 | 中国联合重型燃气轮机技术有限公司 | Gas turbine and swirling device thereof |
| CN112413642B (en) * | 2020-11-09 | 2022-02-15 | 中国人民解放军空军工程大学 | An aero-engine intelligent combustion chamber |
| CN115213849B (en) * | 2021-04-19 | 2024-05-31 | 中国航发商用航空发动机有限责任公司 | Dismounting method and dismounting tool thereof |
| CN113464283B (en) * | 2021-08-10 | 2022-10-21 | 南京航空航天大学 | Compound initiative cooling structure of rotatory detonation engine and rotatory detonation engine |
| CN114001374B (en) * | 2021-11-12 | 2024-12-03 | 西安热工研究院有限公司 | A kind of rotating detonation combustion chamber suitable for gas-liquid two-phase dual-fuel |
| CN115307181A (en) * | 2022-07-15 | 2022-11-08 | 西北工业大学 | Afterburner based on continuous detonation jet initiation and combustion |
| CN116398899B (en) * | 2023-03-09 | 2024-04-26 | 中国空气动力研究与发展中心空天技术研究所 | Centrifugal air hydrogen torch igniter |
| CN117703597B (en) * | 2024-02-06 | 2024-04-12 | 中国空气动力研究与发展中心空天技术研究所 | Microchannel high-temperature-resistant ignition device of ramjet engine, design method and preparation method |
-
2024
- 2024-07-23 CN CN202410988553.6A patent/CN118517719B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036093A (en) * | 2017-06-01 | 2017-08-11 | 华帝股份有限公司 | Three-ring fire burner convenient to disassemble |
| CN116792780A (en) * | 2022-03-16 | 2023-09-22 | 中国航发商用航空发动机有限责任公司 | Oil collecting ring and cooling method thereof, fuel nozzle, combustion chamber and turbine engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118517719A (en) | 2024-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201081598Y (en) | Pressure test device for floating head exchanger | |
| CN101349215B (en) | Double-acting type stirling engine | |
| CN118517719B (en) | Device and method for connecting inner ring and outer ring of micro-channel of rotary detonation ramjet engine | |
| CN204202439U (en) | A kind of Novel single tube journey floating head heat exchanger | |
| CN104464841A (en) | Thermal insulation plate for built-in steam pressurizer of pressurized water reactor and integrated pressurized water reactor formed by thermal insulation plate | |
| CN117703597B (en) | Microchannel high-temperature-resistant ignition device of ramjet engine, design method and preparation method | |
| CN105895169B (en) | A kind of arrangement cluster location structure of reactor thermo-hydraulics experiment | |
| CN113432807A (en) | Universal internal expansion type sealing inspection joint and inspection method thereof | |
| CN108844387B (en) | Heat exchange structure and heat exchanger comprising same | |
| CN202816398U (en) | Reactor fuel assembly shroud with tents and chamfers and reactor fuel assembly | |
| CN114876674A (en) | A water-cooled nozzle for an experimental liquid rocket engine | |
| CN202853123U (en) | Aluminum casting heat exchanger of gas stove | |
| CN107214226B (en) | A kind of fourth born of the same parents heat-transfer pipe electromagnetic heating type extrusion forming device | |
| CN211527826U (en) | Split type double-cavity high-pressure constant-volume combustion bomb | |
| CN213598082U (en) | Cylinder cover for four-air valve diesel engine and diesel engine | |
| CN208983314U (en) | Water screen tube fin with buffering thermal stress and raising heat exchange efficiency | |
| CN211626180U (en) | Vertical heat exchanger | |
| CN210587089U (en) | Cooling system for die casting mold core | |
| CN217542546U (en) | High-temperature gas sampling rake for gas analysis and temperature measurement | |
| CN222115451U (en) | Hot-pressing sintering die | |
| CN112199868A (en) | An optimization method of multi-bolt tightening strategy for joint surface sealing performance requirements | |
| CN201443605U (en) | Polytetrafluoroethylene pneumatic control valve | |
| CN116364315A (en) | Front heat insulation shielding layer structure of horizontal air-cooled reactor and horizontal air-cooled reactor | |
| CN220320585U (en) | Neck butt welding flange for jacket pipe | |
| CN214666305U (en) | Connecting structure of cooler shell and heat exchange core |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |