CN118375796B - Rectangular-section pneumatic right-angle tee joint equipment and design method thereof - Google Patents
Rectangular-section pneumatic right-angle tee joint equipment and design method thereof Download PDFInfo
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- CN118375796B CN118375796B CN202410804210.XA CN202410804210A CN118375796B CN 118375796 B CN118375796 B CN 118375796B CN 202410804210 A CN202410804210 A CN 202410804210A CN 118375796 B CN118375796 B CN 118375796B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005452 bending Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
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- 238000010008 shearing Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a rectangular section pneumatic right-angle tee joint device and a design method thereof, and relates to the field of pneumatic design of wind tunnel devices, wherein the tee joint device comprises: the device comprises a converging pipeline, a first diversion pipeline, a second diversion pipeline, a first flow deflector group, a second flow deflector group, a first round-guiding rectifying plate, a second round-guiding rectifying plate and a combined flow deflector; the invention relates to a rectangular section pneumatic right-angle tee joint device, which is suitable for large pneumatic right-angle tee joint devices with higher flow speed in wind tunnels, and compared with the conventional right-angle tee joint devices: by arranging guide vanes to regulate air flow, flow separation is restrained, pressure loss is reduced, structural vibration is reduced, and equipment service life is prolonged; the design method of the rectangular-section pneumatic right-angle tee joint device can quickly and effectively design the pneumatic high-efficiency right-angle tee joint device according to different application environments and design requirements.
Description
Technical Field
The invention relates to the field of pneumatic design of wind tunnel equipment, in particular to rectangular-section pneumatic right-angle tee joint equipment and a design method thereof.
Background
In the design of pneumatic equipment, a right-angle tee joint is a common pneumatic configuration for realizing airflow diversion/confluence, and generally consists of a confluence pipeline, and a first diversion pipeline and a second diversion pipeline which are perpendicular to and parallel to the confluence pipeline. A tee typically has two flow modes: the first is to realize flow diversion, the air flow flows in from the converging pipeline and flows out from the first diversion pipeline and the second diversion pipeline; the second is to realize flow confluence, and the air flows in from the first diversion pipeline and the second diversion pipeline and flows out from the confluence pipeline. The three-way connection has the advantages of large airflow steering angle, complex flow, obvious flow separation, poor flow stability and large pressure loss. The device has little influence on small-sized equipment and equipment with lower flow speed, but for large-sized pneumatic equipment with higher flow speed in a wind tunnel, structural vibration caused by flow requires stronger supporting equipment, the service life of the equipment is obviously reduced, and larger flow pressure loss requires higher driving power to be provided for the equipment to maintain the flow speed, so that the power consumption of the equipment is increased.
Therefore, for large pneumatic right-angle tee equipment with higher flow speed, a design method needs to be developed to reduce flow vibration and pressure loss so as to improve the performance and service life of the pneumatic right-angle tee equipment.
Disclosure of Invention
In order to solve the technical problems of large structural vibration and large pressure loss caused by flow separation in a large-sized right-angle tee joint in a wind tunnel, the invention provides rectangular-section pneumatic right-angle tee joint equipment, which comprises:
The device comprises a converging pipeline, a first diversion pipeline, a second diversion pipeline, a first flow deflector group, a second flow deflector group, a first round-guiding rectifying plate, a second round-guiding rectifying plate and a combined flow deflector;
The converging pipeline, the first diversion pipeline and the second diversion pipeline are mutually communicated, the upper walls of the converging pipeline, the first diversion pipeline and the second diversion pipeline are overlapped, and the lower walls of the converging pipeline, the first diversion pipeline and the second diversion pipeline are overlapped; one side wall of the converging pipeline is connected with one side wall of the first diverting pipeline through a first round guide rectifying plate; the side wall of the other side of the converging pipeline is connected with the side wall of the second shunt pipeline through a second round guide rectifying plate; the side wall of the other side of the first diversion pipeline is overlapped with the side wall of the other side of the second diversion pipeline, and the combined guide vane is arranged on the side wall of the first diversion pipeline overlapped with the second diversion pipeline; the first guide vane group is arranged on the connecting line of the first rounding guide plate and the combined guide vane, and the second guide vane group is arranged on the connecting line of the second rounding guide plate and the combined guide vane.
The principle of the invention is as follows: the flow distribution of the right-angle tee joint equipment is used for determining the flow distribution/convergence position, and the combined guide plates are arranged at the flow distribution/convergence position, so that tangential flow and backflow near the flow distribution/convergence point are restrained while the flow distribution/convergence in the right-angle tee joint equipment is realized, and the flow energy loss in the right-angle tee joint equipment is reduced; and the guide vane groups are respectively arranged at the positions of the arrangement lines of the converging pipelines determined by the combined guide vanes, so that vortex generated by airflow steering in the right-angle tee joint is restrained, smooth airflow steering is realized, meanwhile, the flow induced structural vibration of the right-angle tee joint equipment is reduced, and the flow energy loss is reduced.
Preferably, the axes of the first diversion pipeline and the second diversion pipeline are parallel, and the axes of the converging pipeline are perpendicular to the axes of the first diversion pipeline and the second diversion pipeline, so that the airflow right-angle steering and diversion/converging are realized.
Preferably, the ratio of the sum of the widths of the first and second shunt tubes to the width of the converging tube is from 1:1.3 to 1.3:1 to avoid flow separation near the surface of the baffle due to too rapid a change in flow velocity. The flow is turned 90 deg. while the flow speed is reduced rapidly, such as by the counter-pressure gradient along the flow direction with the area diffusion, which increases the risk of flow separation of the guide vane, which increases with the increase of the area diffusion ratio, when the area diffusion ratio exceeds about 1.3. Therefore, the control should be between 1:1.3 and 1.3:1, so as to ensure that the risk of flow separation is small under the operation conditions of the split-flow mode and the confluence mode.
Preferably, the center line of the combined guide vane coincides with the diversion line of the converging pipeline, so that backflow and obvious shearing flow near the combined guide vane are avoided, the flow stability is improved, and the flow loss is reduced.
Preferably, the back of the combined flow deflector is attached to the side wall of the first flow diversion pipeline, which coincides with the second flow diversion pipeline, the front of the combined flow deflector is provided with a protrusion extending along the flow diversion line of the flow diversion pipeline, the shape of the side wall of the protrusion, which is close to the first flow deflector group, is matched with the shape of the flow deflector in the first flow deflector group, the shape of the side wall of the protrusion, which is close to the second flow deflector group, is matched with the shape of the flow deflector in the second flow deflector group, so that the rectification of complex flow near the flow diversion end point/the flow diversion start point of the right-angle tee device is realized, the flow loss is reduced, and the flow stability is improved.
Preferably, the first round guide rectifying plate and the second round guide rectifying plate are 1/4 circular arc bent plates. The guide vane has simple structure and convenient processing; the shape of the guide vane is symmetrical along the arrangement line of the guide vane, the forward and reverse flow characteristics are consistent, and when the guide vane is applied to right-angle tee joint equipment, the performance of the two flow modes of flow splitting and converging is consistent.
Preferably, the first deflector group comprises N1 deflector sheets, the N1 deflector sheets are arranged in an equidistant and in-line mode, the arrangement consistency is 2-3, and the applicant researches that the arrangement consistency is less than 2 and flow separation is easy to generate, and the arrangement consistency is more than 3 and increases resistance loss. When the air flow turns 90 degrees, the guide vanes are arranged in an equidistant in-line mode, wherein the equidistant in-line mode has the advantages of simple design and good flow uniformity. Wherein, the arrangement consistency is defined as the ratio of the chord length of the guide vane to the spacing between two adjacent guide vanes along the arrangement direction.
Preferably, the second guide vane group comprises N2 guide vanes, the N2 guide vanes are arranged in an equidistant and in-line mode, the arrangement consistency is 2-3, and the applicant researches that the arrangement consistency is less than 2 and flow separation is easy to generate, and the arrangement consistency is more than 3 and increases resistance loss.
Preferably, the wing profiles and the sizes of the guide vanes in the first guide vane set and the second guide vane set are the same, so that the structural form of the combined guide vanes is simplified, and the processing of each guide vane set of the structure is facilitated.
The invention also provides a design method of the rectangular section pneumatic right-angle tee joint device, which comprises the following steps:
step 1: determining design input parameters includes: the size of the converging pipeline, the flow distribution of the first diversion pipeline and the second diversion pipeline;
Step 2: determining design parameters includes: the second shunt pipeline is provided with guide vane airfoils, the number and the consistency of the guide vanes;
Step 3: determining the section size and the position of a flow dividing line of the converging pipeline according to the flow distribution of the first flow dividing pipeline and the second flow dividing pipeline;
step 4: determining the arrangement line positions and the lengths of the first guide vane group and the second guide vane group according to the position of the flow dividing line of the converging pipeline;
Step 5: determining the chord length and the arrangement spacing of the guide vanes in the second guide vane group according to the arrangement line length, the arrangement consistency and the arrangement number of the second guide vane group;
step 6: determining the number of the arranged guide vanes of the first guide vane group according to the length of the arrangement line of the first guide vane group and the chord length and the arrangement distance of the guide vanes of the second guide vane group;
Step 7: and determining the sizes of the first round guide rectifying plate, the second round guide rectifying plate and the combined guide vane according to the chord lengths of the guide vanes arranged in the first guide vane group and the second guide vane group.
The principle of the method is as follows: the flow distribution of the right-angle tee joint equipment is used for determining the flow distribution/convergence position, and the combined guide plates are arranged at the flow distribution/convergence position, so that tangential flow and backflow near the flow distribution/convergence point are restrained while the flow distribution/convergence in the right-angle tee joint equipment is realized, and the flow energy loss in the right-angle tee joint equipment is reduced; and the guide vane groups are respectively arranged at the positions of the arrangement lines of the converging pipelines determined by the combined guide vanes, so that vortex generated by airflow steering in the right-angle tee joint is restrained, smooth airflow steering is realized, meanwhile, the flow induced structural vibration of the right-angle tee joint equipment is reduced, and the flow energy loss is reduced.
The one or more technical schemes provided by the invention have at least the following technical effects or advantages:
The invention relates to a rectangular section pneumatic right-angle tee joint device, which is suitable for large pneumatic right-angle tee joint devices with higher flow speed in wind tunnels, and compared with the conventional right-angle tee joint devices: by arranging the guide vanes to regulate the air flow, the flow separation, vortex and unstable flow in the large-angle airflow diversion/confluence process are restrained, the pressure loss is reduced, the structural vibration is reduced, and the service life of equipment is prolonged. The conventional right-angle tee has complex flow, a large amount of flow separation, vortex flow and unstable flow, and the flow deflector rectifies and suppresses the non-ideal flow, so that the pressure loss is reduced, the structural vibration is reduced, and the service life of equipment is prolonged.
The design method of the rectangular-section pneumatic right-angle tee joint device can quickly and effectively design the pneumatic high-efficiency right-angle tee joint device according to different application environments and design requirements.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a three-dimensional illustration of a rectangular section pneumatic right-angle tee device;
FIG. 2 is a schematic horizontal cross-section of a rectangular section pneumatic right-angle tee apparatus;
FIG. 3 is a schematic view of a baffle structure;
FIG. 4 is a schematic view of a combined baffle;
FIG. 5 is a schematic view of a converging duct diverging line and a baffle arrangement line;
The device comprises a 1-converging pipeline, a 2-first diverting pipeline, a 3-second diverting pipeline, a 4-first diversion sheet set, a 5-second diversion sheet set, a 6-first rounding diversion sheet, a 7-second rounding diversion sheet, an 8-combined diversion sheet, a 9-converging pipeline diversion line, a 10-first diversion sheet set arrangement line, a 11-second diversion sheet set arrangement line, a 12-converging pipeline diversion line to first diversion pipeline direction side wall distance, a 13-converging pipeline diversion line to second diversion pipeline direction side wall distance, a 14-first diversion pipeline width and a 15-second diversion pipeline width.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than within the scope of the description, and therefore the scope of the invention is not limited to the specific embodiments disclosed below.
Embodiment one;
Referring to fig. 1-5, an embodiment of the present invention provides a rectangular section pneumatic right-angle tee apparatus, including: the device comprises a converging pipeline, a first diversion pipeline, a second diversion pipeline, a first flow deflector group, a second flow deflector group, a first round-guiding rectifying plate, a second round-guiding rectifying plate and a combined flow deflector.
The rectangular section pneumatic right-angle tee joint device can be applied to the following two flowing states: the medium flows in from the converging pipeline, flows out from the first flow dividing pipeline and flows out from the second flow dividing pipeline; the medium flows in from the first shunt pipeline and the second shunt pipeline, and flows out from the confluence pipeline.
The axes of the first shunt pipeline and the second shunt pipeline are parallel, and the upper wall, the lower wall and the outer side wall of the first shunt pipeline are coincident.
The axis of the converging pipeline is vertical to the axes of the first diversion pipeline and the second diversion pipeline, and the upper wall and the lower wall of the converging pipeline are coincident.
And determining the position of the flow dividing line of the converging pipeline and the widths of the first flow dividing pipeline and the second flow dividing pipeline according to the flow or speed distribution of the first flow dividing pipeline and the second flow dividing pipeline. The ratio of the sum of the widths of the first diversion pipeline and the second diversion pipeline to the width of the confluence pipeline is in the range of 1:1.3-1.3:1 so as to prevent obvious separation of the flow near the surface of the guide vane.
The combined guide vane is arranged on the overlapped side wall of the first diversion pipeline and the second diversion pipeline, and the center line is overlapped with the diversion line of the confluence pipeline.
The first rounding flow guide plate is a 1/4 circular arc bent plate and is positioned at the intersection of the converging pipeline and the side wall of the first diverging pipeline.
The second round guide rectifying plate is a 1/4 circular arc bent plate and is positioned at the intersection of the converging pipeline and the side wall of the second shunt pipeline.
The first guide vane groups are formed by arranging N1 guide vanes at equal intervals in an in-line mode, the arrangement positions are connecting lines of the first round guide flow regulating plates and the combined guide vanes, the arrangement consistence is 2-3, flow separation is easy to generate when the arrangement consistence is less than 2, and resistance loss is increased when the arrangement consistence is greater than 3.
The second guide vane groups are formed by equally spacing and in-line arrangement of N2 guide vanes with the same guide vanes, the arrangement positions are connecting lines of the second guide circular rectifying plates and the combined guide vanes, the arrangement consistence is 2-3, flow separation is easily caused near the surfaces of the guide vanes when the arrangement consistence is less than 2, and resistance loss is increased by more than 3.
The air deflector wing profiles and the sizes of the first air deflector group and the second air deflector group are consistent.
The number of the guide vanes N1 and N2 of the first guide vane group and the second guide vane group is more than or equal to 5.
On the basis of the first embodiment, the second embodiment of the invention provides a design method of pneumatic right-angle tee equipment, which comprises the following steps:
Step 1: determining design input parameters includes: the merging pipe size, the first split pipe, and the second split pipe flow distribution (the default first split pipe flow is not less than the second split pipe flow).
Step 2: design parameters are determined. The second shunt pipeline is provided with guide vane airfoils, the number and the consistency of the guide vanes.
Step 3: the section size and the position of the flow dividing line of the converging pipeline are determined according to the flow distribution of the first flow dividing pipeline and the second flow dividing pipeline, and the specific mode is as follows:
；
Wherein d is the width of the converging pipeline, d1 is the distance from the diverging line of the converging pipeline to the side wall of the first diverging pipeline in the direction, d2 is the distance from the diverging line of the converging pipeline to the side wall of the second diverging pipeline in the direction, and G1:G2 is the ratio of the flow of the first diverging pipeline to the flow of the second diverging pipeline.
Step 4: the length of the arrangement line of the first guide vane group and the second guide vane group is determined according to the diversion line, and the specific mode is as follows:
；
Wherein D1 is the width of the first diversion pipeline, D2 is the width of the second diversion pipeline, L1 is the length of the first diversion sheet arrangement line, and L2 is the length of the second diversion sheet arrangement line.
Step 5: according to the arrangement line length, the arrangement consistency and the arrangement number of the second guide vane group, the arrangement distance and the chord length of the guide vanes are determined, and the specific modes are as follows:
；
Wherein N2 is the number of the flow deflectors in the second flow deflector group, eta 2 is the arrangement consistency of the flow deflectors of the second shunt pipeline, S2 is the arrangement interval of the flow deflectors of the second shunt pipeline, and C2 is the chord length of the flow deflectors of the second shunt pipeline.
Step 6: according to the length of the arrangement line of the first guide vane group, the chord length of the guide vane of the second guide vane group and the arrangement distance, the number of the guide vanes arranged in the first guide vane group is determined in the following specific mode:
；
wherein N1 is the number of the guide vanes in the first guide vane group, and floor is a rounding function.
Step 7: according to the chord lengths of the guide vanes arranged in the first guide vane group and the second guide vane group, the sizes of the first guide circular rectifying plate, the second guide circular rectifying plate and the combined guide vane are determined, and the specific mode is as follows:
；
Wherein R1 is the arc radius of the first guide vane group guide vane, R2 is the arc radius of the second guide vane group guide vane, and R is the arc radius of the combined guide vane.
The following describes an example of the second embodiment in combination with a specific example:
in order to reduce the height of a vertical wind tunnel, a double-reflux type layout is adopted, airflow is divided into two parts at the downstream of a test section collector, and airflow circulation is formed by different loops at two sides, and a right-angle tee joint with one inlet and two outlets is required to be arranged. The specific design steps of the tee joint are as follows:
Step 1: input parameters are determined. The inlet cross-sectional dimension is 4m x 4m; the two outlet flow rates are consistent, and the relative inlet flow rate is reduced by 25%; the flow ratio of the first diversion pipeline to the second diversion pipeline is 6:4.
Step 2: design parameters are determined. The second flow deflector group adopts 1/4 circular arc bent plate flow deflectors, the front and the rear of which are respectively prolonged by 10% of the radius of the circular arc, the arrangement consistency of the flow deflectors is designed to be 3, and the number of the flow deflectors is 7.
Step 3: according to the flow distribution of the first diversion pipeline and the second diversion pipeline, the cross section size of the first diversion pipeline is 3m multiplied by 4m, and the cross section size of the second diversion pipeline is 2m multiplied by 4m; the position of the flow dividing line of the converging pipeline is 2.4m away from the side wall of the first flow dividing pipeline and 1.6m away from the side wall of the second flow dividing pipeline.
Step 4: and determining the length of the first guide vane group arrangement line to be 3.84m and the length of the second guide vane group arrangement line to be 2.56m according to the position of the split line.
Step 5: and determining the chord length of the guide vane to be 0.96m and the arrangement spacing to be 0.32m according to the arrangement line length, the arrangement consistency and the arrangement number of the first guide vane group.
Step 6: and determining that the number of the arranged guide vanes of the first guide vane group is 11 according to the length of the arrangement line of the first guide vane group, the chord length of the guide vanes of the second guide vane group and the arrangement distance.
Step 7: and determining the arc radius of the guide vane to be 0.20m according to the chord lengths of the guide vanes arranged in the first guide vane group and the second guide vane group, and respectively prolonging the arc radius of the guide vane to be 0.02m in the front-back direction. The radius of the circular arc of the first circular guide rectifying plate, the radius of the circular arc of the second circular guide rectifying plate and the radius of the combined guide vane are consistent with the radius of the guide vane, and are all 0.20m.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The design method of the rectangular section pneumatic right-angle tee joint device is characterized by comprising the following steps of:
step 1: determining design input parameters includes: the size of the converging pipeline, the flow distribution of the first diversion pipeline and the second diversion pipeline;
Step 2: determining design parameters: the second shunt pipeline is provided with guide vane airfoils, the number and the consistency of the guide vanes;
step 3: the section size and the position of the flow dividing line of the converging pipeline are determined according to the flow distribution of the first flow dividing pipeline and the second flow dividing pipeline, and the specific mode is as follows:
；
Wherein d is the width of the converging pipeline, d1 is the distance from the diverging line of the converging pipeline to the side wall of the first diverging pipeline in the direction, d2 is the distance from the diverging line of the converging pipeline to the side wall of the second diverging pipeline in the direction, and G1:G2 is the flow ratio of the first diverging pipeline to the second diverging pipeline;
step 4: the length of the arrangement line of the first guide vane group and the second guide vane group is determined according to the split line, and the specific mode is as follows:
；
wherein D1 is the width of the first diversion pipeline, D2 is the width of the second diversion pipeline, L1 is the length of the first diversion sheet arrangement line, and L2 is the length of the second diversion sheet arrangement line;
Step 5: according to the arrangement line length, the arrangement consistency and the arrangement number of the second guide vane group, the arrangement distance and the chord length of the guide vanes are determined, and the specific modes are as follows:
；
Wherein N2 is the number of the flow deflectors in the second flow deflector group, eta 2 is the arrangement consistency of the flow deflectors of the second shunt pipeline, S2 is the arrangement interval of the flow deflectors of the second shunt pipeline, and C2 is the chord length of the flow deflectors of the second shunt pipeline;
step 6: according to the length of the arrangement line of the first guide vane group, the chord length of the guide vane of the second guide vane group and the arrangement distance, the number of the guide vanes arranged in the first guide vane group is determined in the following specific mode:
；
wherein N1 is the number of guide vanes in the first guide vane group, and floor is a rounding function;
Step 7: according to the chord lengths of the guide vanes arranged in the first guide vane group and the second guide vane group, the sizes of the first guide circular rectifying plate, the second guide circular rectifying plate and the combined guide vane are determined, and the specific mode is as follows:
；
wherein R1 is the arc radius of the guide vane of the first guide vane set, R2 is the arc radius of the guide vane of the second guide vane set, and R is the arc radius of the combined guide vane;
wherein, a pneumatic right angle tee bend equipment of rectangle cross-section includes:
The device comprises a converging pipeline, a first diversion pipeline, a second diversion pipeline, a first flow deflector group, a second flow deflector group, a first round-guiding rectifying plate, a second round-guiding rectifying plate and a combined flow deflector;
the converging pipeline, the first diversion pipeline and the second diversion pipeline are mutually communicated, the upper walls of the converging pipeline, the first diversion pipeline and the second diversion pipeline are overlapped, and the lower walls of the converging pipeline, the first diversion pipeline and the second diversion pipeline are overlapped; one side wall of the converging pipeline is connected with one side wall of the first diverting pipeline through a first round guide rectifying plate; the side wall of the other side of the converging pipeline is connected with the side wall of the second shunt pipeline through a second round guide rectifying plate; the side wall of the other side of the first diversion pipeline is overlapped with the side wall of the other side of the second diversion pipeline, and the combined guide vane is arranged on the side wall of the first diversion pipeline overlapped with the second diversion pipeline; the first guide vane group is arranged on the connecting line of the first rounding guide plate and the combined guide vane, and the second guide vane group is arranged on the connecting line of the second rounding guide plate and the combined guide vane; the back of the combined guide vane is attached to the side wall of the first diversion pipeline, which coincides with the second diversion pipeline, the front of the combined guide vane is provided with a protrusion extending along the diversion line of the confluence pipeline, the shape of the side wall of the protrusion close to the first guide vane group is matched with the shape of the guide vane in the first guide vane group, and the shape of the side wall of the protrusion close to the second guide vane group is matched with the shape of the guide vane in the second guide vane group.
2. The method for designing a rectangular-section pneumatic right-angle tee device according to claim 1, wherein the first split-flow pipeline is parallel to the axis of the second split-flow pipeline, and the axis of the converging pipeline is perpendicular to the axes of the first split-flow pipeline and the second split-flow pipeline.
3. The method for designing a rectangular-section pneumatic right-angle tee apparatus according to claim 1, wherein the ratio of the sum of the widths of the first and second branch pipes to the width of the merging pipe is 1:1.3 to 1.3:1.
4. The method for designing a rectangular-section pneumatic right-angle tee apparatus according to claim 1, wherein the center line of the combined guide vane coincides with the split line of the converging duct.
5. The method for designing the rectangular-section pneumatic right-angle tee joint device according to claim 1, wherein the first round guide rectifying plate and the second round guide rectifying plate are 1/4 circular arc bending plates.
6. The method for designing the rectangular-section pneumatic right-angle tee joint device according to claim 1, wherein the first guide vane group comprises N1 guide vanes, the N1 guide vanes are arranged in an equidistant and in-line mode, and the arrangement consistency is 2-3.
7. The method for designing a rectangular-section pneumatic right-angle tee device according to claim 1, wherein the second flow deflector group comprises N2 flow deflectors, the N2 flow deflectors are arranged in an equidistant and in-line manner, and the arrangement consistency is 2-3.
8. The method of designing a rectangular section pneumatic right angle tee apparatus of claim 1 wherein the vane airfoils and sizes in the first and second vane sets are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN204942855U (en) * | 2015-07-15 | 2016-01-06 | 浙江万通管业有限公司 | Tee union |
| CN113125892A (en) * | 2021-05-13 | 2021-07-16 | 重庆哈丁环境试验技术股份有限公司 | A water conservancy diversion part and circulation air duct system for sand and dust test box |
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| GB889039A (en) * | 1959-04-13 | 1962-02-07 | Richardsons Westgarth & Co | Improvements in or relating to ducts |
| US5197509A (en) * | 1990-06-06 | 1993-03-30 | Cheng Dah Y | Laminar flow elbow system and method |
| JPH05223109A (en) * | 1992-02-13 | 1993-08-31 | Hitachi Ltd | Rectifying duct |
| CA2221158C (en) * | 1995-05-09 | 2006-08-08 | Labatt Brewing Company Limited | Static fluid flow mixing apparatus |
| DE19822713A1 (en) * | 1998-05-20 | 1999-11-25 | Sverdrup Technology Inc | Wind tunnel with acoustically dampened deflector corner |
| CN106885083A (en) * | 2017-04-11 | 2017-06-23 | 武汉海博瑞科技有限公司 | A kind of vibration-damping noise-reduction type pipe fitting and its manufacture method |
| CN208060122U (en) * | 2018-05-02 | 2018-11-06 | 四川省银河化学股份有限公司 | A kind of double cambered surface flow deflectors |
| CN115544680A (en) * | 2022-09-02 | 2022-12-30 | 中国矿业大学 | Optimal Design Method for a Quarter-Turn Cavity Guide Vane System |
| CN116772013A (en) * | 2023-06-26 | 2023-09-19 | 武汉科技大学 | Rectangular air pipe low-resistance rectifying tee joint and design method thereof |
| CN116992574B (en) * | 2023-09-25 | 2023-11-28 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Arc corner guide vane airfoil design method based on characteristic parameters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204942855U (en) * | 2015-07-15 | 2016-01-06 | 浙江万通管业有限公司 | Tee union |
| CN113125892A (en) * | 2021-05-13 | 2021-07-16 | 重庆哈丁环境试验技术股份有限公司 | A water conservancy diversion part and circulation air duct system for sand and dust test box |
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