CN112484076B - Special-shaped nozzle for main stage oil supply of lean oil premixed preevaporation low pollution combustion chamber - Google Patents
Special-shaped nozzle for main stage oil supply of lean oil premixed preevaporation low pollution combustion chamber Download PDFInfo
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- CN112484076B CN112484076B CN202011261459.9A CN202011261459A CN112484076B CN 112484076 B CN112484076 B CN 112484076B CN 202011261459 A CN202011261459 A CN 202011261459A CN 112484076 B CN112484076 B CN 112484076B
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- 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
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means
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- 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
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
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- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention relates to a special-shaped nozzle for main-stage oil supply of a lean-oil premixing and pre-evaporating low-pollution combustor, belonging to the field of combustion of gas turbines; the invention arranges special-shaped spray holes in the airflow channel of the main-stage swirler to form a main-stage oil supply direct injection special-shaped nozzle; the special-shaped nozzles are uniformly distributed along the circumferential direction of the main swirler so as to form fuel spatial distribution which is uniformly distributed along the circumferential direction, increase the contact area of fuel and air, improve the oil-gas mixing effect, improve the fuel distribution uniformity, and reduce a local high-temperature area caused by fuel enrichment after the main-stage spray holes, thereby effectively reducing the generation of pollutants such as NOx, CO and the like. The effect of adjusting the downstream temperature uniform distribution of the primary spray hole is achieved by changing the penetration depth, the jet direction and the jet circumferential expansion angle of the fuel jet of the primary direct-injection type nozzle spray hole, and the generation of pollutants such as NOx, CO and the like is reduced.
Description
Technical Field
The invention belongs to the field of combustion of gas turbines, and particularly relates to a special-shaped nozzle for main-stage oil supply of a lean oil premixing and pre-evaporation low-pollution combustion chamber.
Background
At present, the civil aviation engine discharges more and more pollutants to the atmosphere, and the pollution to the atmosphere is more and more serious. In order to control the influence of the emission of the aircraft engine on the environment, the pollution emission requirement of the civil aircraft combustion chamber meets the ICAO CAEP standard of the International civil aviation organization, and NO is subjectedXThe emission requirements are becoming more and more stringent. At present, in a combustion chamber of a civil aviation engine, a lean oil premixing and pre-evaporation low-pollution combustion technology is often adopted to reduce NOXAnd (5) discharging. In a lean oil premixing and pre-evaporating combustion chamber, the low-pollution emission target is realized by carrying out classified and partitioned combustion on fuel oil and air, wherein the main-grade fuel oil is directly sprayed by adopting a direct injection type nozzle, spray holes of the traditional direct injection type nozzle are regular round holes, the penetration depth of jet flow of the round holes is insufficient, the atomization effect of the direct injection type nozzle is poor, and meanwhile, the circle of a main-grade swirler is roundThe fuel oil in the circumferential direction is not uniformly distributed in space, the oil-gas mixing is insufficient, a fuel oil enrichment area appears at the downstream of each round hole injection point, and a local high-temperature area of a main-level outlet is formed, so that the generation amount of pollutant NOx is increased.
Disclosure of Invention
Aiming at the defects of the problems, the invention provides the special-shaped nozzle for the main-stage oil supply in the lean oil premixing and pre-evaporation low-pollution combustion chamber, which changes the penetration depth, the atomization effect, the flow direction of the jet flow and the circumferential expansion angle of the jet flow by changing the structure of the spray hole of the special-shaped nozzle, achieves the effect of improving the downstream fuel enrichment of the nozzle, and further adjusts the temperature distribution condition of the local high-temperature area at the downstream of the main-stage nozzle. The temperature distribution of the local high-temperature area at the outlet of the main stage is improved, so that the NOx generation amount is reduced.
The invention is realized by the following steps:
a special-shaped nozzle for main-stage oil supply of a lean-oil premixing and pre-evaporating low-pollution combustion chamber relates to a combustion chamber, which comprises a diffuser and a combustion chamber casing arranged at the rear end of the diffuser, wherein an oil spraying rod is arranged on the combustion chamber casing, a flame tube is arranged inside the combustion chamber casing, the head of the flame tube is provided with a combustion chamber head, and the combustion chamber head is connected with the casing through the oil spraying rod; the head part of the combustion chamber is of a circular double-ring cavity structure, the head part of the combustion chamber is divided into an office class part and a main stage part, and the main stage surrounds the outer ring of the office class; the duty-level cyclone comprises a sleeve, and a duty-level cyclone is arranged inside the sleeve; the main stage comprises a main stage swirler, an oil collecting groove is formed in the main stage swirler, and an oil spraying rod is connected outside the oil collecting groove; the air flow channel of the main-stage swirler is provided with a special-shaped nozzle, and the rear end of the special-shaped nozzle is a main-stage premixing annular cavity.
Further, the flame tube is divided into a flame tube outer ring wall surface and a flame tube inner ring wall surface; the channel between the outer ring wall surface of the flame tube and the combustion chamber casing is a combustion chamber outer ring channel, and the channel between the inner ring wall surface of the flame tube and the combustion chamber casing is a combustion chamber inner ring channel.
Furthermore, the oil injection rod is respectively provided with a duty centrifugal nozzle and a double-oil-way pipeline of the main oil supply pipe, the duty centrifugal nozzle is connected with the duty, and the main oil supply pipe is connected with the oil collecting tank.
Furthermore, the spray hole structure types of the special-shaped nozzle comprise a leaf-shaped hole, a sickle-shaped hole, a fan-shaped hole, a multi-leaf-shaped hole and the like and other special-shaped hole structures different from the traditional circular fuel spray hole structure; or under the working condition of great main-stage oil supply, the fuel oil spray holes are communicated in the circumferential direction of the main-stage swirler to form full-slit fuel oil spray holes.
Further, the spraying holes of the special-shaped nozzle are arranged on the inner wall surface of the main-stage swirler, the spraying holes are respectively communicated with the oil collecting tank and the airflow channel of the main-stage swirler, the interface of the spraying holes of the special-shaped nozzle communicated with the oil collecting tank is defined as the outer wall surface P1 of the special-shaped nozzle, the interface of the spraying holes communicated with the airflow channel of the main-stage swirler is defined as the inner wall surface P2 of the special-shaped nozzle, and fuel flows through the outer wall surface P1 of the nozzle and the inner wall surface P2 of the nozzle in sequence when being sprayed out from the spraying holes through the oil collecting tank; the shapes of the inner wall surface and the outer wall surface comprise leaf-shaped holes, sickle-shaped holes, fan-shaped holes, multi-leaf shapes and other irregular circular shapes.
Furthermore, 6-36 special-shaped nozzles are uniformly distributed along the circumferential direction of the main swirler, and fuel oil forms uniformly distributed fuel oil jet flows in the circumferential direction through the special-shaped nozzles, so that the fuel oil mixing process is facilitated; the number of the spray holes is different according to different working condition requirements, and the structure types of the spray holes are the same or different.
Further, the height of the spray hole of the special-shaped nozzle is h, the section parallel to the inner wall surface and the outer wall surface at the half-height position is defined as a half-height section P3 of the special-shaped nozzle, the length of the shortest arc line between two end points of the half-height section along the circumferential direction of the main-stage swirler is defined as a long axis a of the special-shaped nozzle, and the shortest straight-line distance between two end points of the half-height section along the vertical direction of the long axis is defined as a short axis b of the special-shaped nozzle; the ratio of the long axis to the short axis of the characteristic parameter of the special-shaped nozzle is defined as the shape coefficient of the special-shaped nozzle, and the long axis a of the nozzle is larger than the short axis b, namely the shape coefficient of the nozzle is larger than 1. When the working condition of the fuel is fixed, the jet depth and the circumferential expansion angle of the fuel jet are changed by changing the shape coefficient of the special-shaped nozzle, the circumferential and radial coverage areas of the fuel are increased, the fuel is distributed more uniformly, the fuel aggregation phenomenon is avoided, the local high-temperature area behind the main-level fuel injection point is eliminated, and the generation amount of NOx is reduced.
Furthermore, the central axis of the nozzle hole of the special-shaped nozzle forms an angle with the central axis of the main swirler, and the angle ranges from 45 degrees to 135 degrees; the fuel jet flow direction is changed by adjusting the included angle alpha between the central axis of the jet hole and the central axis of the main swirler, so that the fuel jet flow has the radial speed along the radial direction of the main swirler, the contact area and the contact time of fuel and air flow are increased, the oil-gas mixing effect is improved, the combustion efficiency is improved, and the temperature distribution condition behind a main injection point is improved. The fuel jet can be obliquely injected into a rotary airflow zone in an airflow channel of the main-stage swirler upstream, can be injected into the airflow channel perpendicular to the inner wall surface of the main-stage swirler, and can also be obliquely injected into the rotary airflow zone downstream; according to the design requirement of a combustion chamber, the vertical special-shaped nozzle, the forward-inclined special-shaped nozzle and the backward-inclined special-shaped nozzle can be used independently or matched with each other, jet flow sprayed by the nozzles uniformly arranged in the circumferential direction of the main-stage cyclone forms an oil film with a certain thickness, and under the shearing action of main-stage cyclone air, atomization is carried out, the oil film is diffused to the periphery and interacts with air flow to form an evenly-mixed oil-gas mixture.
Furthermore, the central axis of the jet orifice of the special-shaped nozzle forms an angle with the radial direction of the main swirler passing through the center of the orifice, and the angle ranges from minus 45 degrees to 45 degrees; the flow direction of the fuel jet is changed by adjusting the included angle between the section of the long shaft and the central axis of the main swirler, so that the jet has tangential velocity along the circumferential direction, and a plurality of rotary fuel jets are formed. The rotating fuel oil jet meets the rotating airflow coming out of the main cyclone, the mutual shearing acting force between oil and gas is enhanced, the atomization of the fuel oil and the mixing process of the oil and gas are promoted, the formation of an oil mist field with uniform spatial distribution is facilitated, the fuel oil gathering phenomenon is eliminated, the temperature distribution condition behind the nozzle is improved, and therefore the generation of pollutants is effectively reduced. In the head part of the combustion chamber, special-shaped nozzles with the same rotating direction need to be selected, so that the cross among a plurality of strands of different-direction fuel oil rotational flows is avoided, and the rotational flow characteristics are weakened and influenced. According to the design requirement of the combustion chamber, the same-swirl special-shaped nozzles with different structure types can be selected to form the same-direction rotary jet with different swirl speeds.
Furthermore, the types of the special-shaped nozzles comprise straight surface special-shaped nozzles and fan-shaped surface special-shaped nozzles according to the shapes of the cross-shaft center sections of the spraying holes of the special-shaped nozzles. In the head part of the single-head combustion chamber, the straight surface special-shaped nozzle and the fan-shaped surface special-shaped nozzle can be used independently or cooperatively. Through fan-shaped face abnormal shape nozzle, form the fan-shaped face that has certain expansion angle, on the basis of straight face abnormal shape nozzle, further increase the expansion angle of fuel shooting flow face, increase space coverage area promotes oil gas mixing process, lets the fuel distribute more evenly for the temperature distribution at main nozzle rear is more even, thereby reduces NOx's formation.
Further, the special-shaped nozzles can be divided into different types according to different structural parameters, and cross overlapping areas exist among the nozzles of various types; for example, the flat surface profile nozzle includes a vertical profile nozzle, a forward-inclined profile nozzle, and a backward-inclined profile nozzle, and the flat surface profile nozzle includes a non-rotating profile nozzle, a forward-rotating profile nozzle, and a backward-rotating profile nozzle.
Compared with the prior art, the invention has the beneficial effects that:
1) the special-shaped nozzle for the main-stage fuel supply in the lean-oil premixing and pre-evaporation low-pollution combustion chamber changes the penetration depth, the jet direction and the jet circumferential covering angle of the main-stage fuel jet by changing the structural parameters of the jet hole of the main-stage nozzle, and eliminates the fuel concentration phenomenon behind the main-stage fuel nozzle, thereby reducing the generation amount of pollutants;
2) compare in traditional round hole jet nozzle, under the same fuel operating mode condition, because the flow area of heterotypic nozzle orifice reduces, the jet velocity of fuel efflux increases for the efflux penetration depth increases, and area of contact between fuel and the air current increases, and oil gas mixing efficiency increases, forms the even oil mist field of spatial distribution, thereby reaches the effect that reduces the pollutant and discharges.
3) Compare in traditional round hole efflux nozzle, under the same circumstances of circulation area, the spanwise distance is great on the circumference of following of heterotypic nozzle, and the area of coverage of the fuel efflux of formation is great on the circumferencial direction, and the fuel efflux face distributes more evenly along the circumferencial direction, has avoided the main grade fuel to concentrate the local high temperature that leads to reach the effect that reduces the pollutant and discharge.
4) Compared with the traditional circular hole jet flow nozzle, the special-shaped nozzle enables the fuel jet flow to enter the airflow area at different angles by changing the flowing direction of the fuel jet flow, the contact time of the fuel and air is prolonged, oil-gas mixing is facilitated, the spatial distribution uniformity of the fuel is improved, and the effect of reducing pollution is achieved.
5) Compare in traditional round hole efflux nozzle, the flow direction of abnormal shape nozzle through changing the fuel efflux for the fuel efflux becomes circumferencial direction's rotatory efflux, and fuel whirl and air whirl interact promote fuel atomization, oil-gas mixing process, improve fuel spatial distribution homogeneity, thereby realize reducing the purpose that pollutes.
6) Compare in traditional round hole efflux nozzle, the special-shaped nozzle is through the shape that changes the fuel efflux face for the fuel efflux becomes the fan-shaped efflux face that has the expansion angle, has further increased the area of coverage of fuel efflux in the circumferential direction, makes fuel spatial distribution more even, thereby realizes reducing the purpose that pollutes.
7) Compare in traditional round hole jet nozzle, the heterotypic nozzle of different structure types can cooperate the use, increases the penetration depth of fuel efflux, changes the fuel efflux flow direction and increases the circumference coverage of fuel efflux face simultaneously for the fuel distributes more evenly, and oil-gas mixing effect is better, has improved the main grade export temperature distribution condition, thereby reduces the formation volume of pollutant.
Drawings
FIG. 1 is a lean premixed pre-evaporated low pollution combustor with a profiled nozzle according to the present invention;
FIG. 2 is an enlarged view of the head portion of the combustion chamber of FIG. 1;
FIG. 3 is a schematic view of an exemplary type of profiled nozzle of the present invention;
FIG. 4 is a schematic illustration of the form factor of the profiled nozzle of the present invention;
FIG. 5 is a classification of the profiled nozzle of the present invention according to the direction of the jet;
FIG. 6 is a classification of the profile nozzle of the present invention according to swirl direction;
FIG. 7 is a classification of the profile nozzle of the present invention according to the shape of the jet surface;
wherein: 1. the fuel injection device comprises a diffuser, 2, a combustion chamber casing, 3, an oil spray rod, 4, a combustion chamber head, 5, a flame tube outer ring wall surface, 6, a combustion chamber outer ring channel, 7, a combustion chamber inner ring channel, 8, a flame tube inner ring wall surface, 9, a main stage, 10, an on-duty stage, 11, a main stage oil supply pipe, 12, a main stage swirler, 13, an oil collecting tank, 14, a main stage special-shaped nozzle, 15, a main stage premixing ring cavity, 16, a sleeve, 17, an on-duty stage swirler and 18, an on-duty centrifugal nozzle; 100. the fuel nozzle comprises a vertical special-shaped nozzle, 101, a forward-inclined special-shaped nozzle, 102, a backward-inclined special-shaped nozzle, 200, a non-rotating special-shaped nozzle, 201, a forward-rotating special-shaped nozzle, 202, a backward-rotating special-shaped nozzle, 300, a straight-plane special-shaped nozzle, 301, a fan-shaped special-shaped nozzle, 140, a leaf-shaped hole, 141, a sickle-shaped hole, 142, a fan-shaped hole, 143, and 144, a full-slit fuel nozzle hole.
Detailed Description
In order to make the objects and effects of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings. It should be noted that the specific operation described herein is only for explaining the present invention and is not used to limit the present invention.
As shown in fig. 1, the structure of the lean premixed, pre-evaporated and low-pollution combustor with the special-shaped nozzle of the invention is schematically shown, and comprises a diffuser 1, a combustor casing 2 arranged at the rear end of the diffuser, an oil injection rod 3, a combustor inner ring channel 7 and a combustor outer ring channel 6; the device is characterized in that the oil spray rod 3 is arranged on the combustion chamber casing 2, and the oil spray rod 3 is respectively provided with a double-oil-way pipeline of an on-duty centrifugal nozzle 18 and a main-stage oil supply pipe 11; the combustor casing 2 comprises a combustor head 4, a flame tube inner ring wall surface 8 and a flame tube outer ring wall surface 5 in sequence along the incoming air flow direction.
As shown in fig. 2, the combustion chamber head 4 is of a circular double-ring cavity structure and is connected with the casing 2 through the fuel spray rod 3, the combustion chamber head 4 is divided into two parts, namely an overtime stage 10 and a main stage 9, and the main stage 9 surrounds the outer ring of the overtime stage 10; the class 10 comprises a two-stage swirler 17 and a sleeve 16; the main stage comprises a main stage swirler 12, a main stage oil supply pipe 11, an oil collecting tank 13, special-shaped nozzles 14 and a main stage premixing annular cavity 15, wherein the special-shaped nozzles 14 are arranged in an airflow channel of the main stage swirler 12, and 6-36 special-shaped nozzles are uniformly arranged along the circumferential direction of the main stage swirler.
The invention adopts a special-shaped nozzle to replace the traditional circular hole jet flow nozzle, the typical type of the special-shaped nozzle is schematically shown in figure 3, and the types of the special-shaped nozzle comprise but are not limited to a leaf-shaped hole, a sickle-shaped hole, a fan-shaped hole, a multi-leaf-shaped hole nozzle and the like. On a single combustion chamber head, different types of special-shaped nozzles can be matched for use, and the fuel spatial distribution uniformity is improved.
As shown in fig. 4 to 7, the height of the injection hole of the special-shaped nozzle 14 is defined as h, the section parallel to the inner and outer wall surfaces at the half-height position is defined as a half-height section P3 of the special-shaped nozzle, and the length of the shortest arc line between two end points of the half-height section along the circumferential direction of the primary swirler is defined as a characteristic parameter of the special-shaped nozzle: and a long axis a, wherein the shortest straight line distance between two end points of the half-height section in the vertical direction of the long axis is defined as a characteristic parameter of the special-shaped nozzle: a minor axis b; the ratio of the long axis to the short axis of the characteristic parameter of the special-shaped nozzle is defined as the shape coefficient of the special-shaped nozzle, the long axis a of the nozzle is larger than the short axis b, namely the shape coefficient of the nozzle is larger than 1, the circumferential coverage area of the fuel jet flow can be adjusted by adjusting the length of the long axis, and the penetration depth of the fuel jet flow can be adjusted by adjusting the length of the short axis. Defining an angle alpha between the central axis of the spray hole of the special-shaped nozzle 14 and the central axis of the main-stage swirler 12, wherein the angle range is 45-135 degrees; the fuel jet can be obliquely shot into a rotary airflow region in an airflow channel of the main-stage swirler upstream, can be shot into the airflow channel perpendicular to the inner wall surface of the main-stage swirler, and can be obliquely shot into the rotary airflow region downstream; the jet flow sprayed by a plurality of nozzles uniformly arranged along the circumferential direction of the main cyclone forms an oil film with a certain thickness, and the oil film is atomized, diffused to the periphery and mixed with air under the shearing action of the main cyclone air; the profile nozzles are divided into a vertical profile nozzle 100, a forward-inclined profile nozzle 101, and a backward-inclined profile nozzle 102 according to the direction of the jet flow entering the airflow zone. Forming an angle omega between the central axis of the spray hole of the special-shaped nozzle 14 and the radial direction of the main-stage swirler 12 passing through the center of the spray hole, wherein the angle range is-45 degrees; the flow direction of the fuel oil jet flow is changed by adjusting the included angle between the section of the long shaft and the central axis of the main swirler, so that the jet flow has tangential speed along the circumferential direction, and a rotary fuel oil jet flow is formed; the shaped nozzles are classified into a non-swirl shaped nozzle 200, a forward-swirl shaped nozzle 201, and a reverse-swirl shaped nozzle 202 according to the rotation direction of the jet flow, as viewed from the combustion chamber outlet to the combustion chamber interior. The cross section of the shaft passing center of the spray hole of the special-shaped nozzle 14 is rectangular, parallelogram or isosceles trapezoid; the inner wall surface and the outer wall surface of the special-shaped nozzle are same in shape and proportional in size, the size ratio of the inner wall surface to the outer wall surface is greater than or equal to 1, when the size ratio of the inner wall surface to the outer wall surface is equal to 1, the section of the through-axis center is rectangular or parallelogram, and when the size ratio of the inner wall surface to the outer wall surface is greater than 1, the section of the through-axis center is isosceles trapezoid; the types of the special-shaped nozzles comprise a straight surface special-shaped nozzle 300 and a fan-shaped surface special-shaped nozzle 301 according to the structural shape of the cross-shaft center section of the special-shaped nozzle. On single combustion chamber head, evenly distributed is at the ascending a plurality of nozzles of main swirler circumference direction, and the shape factor can be different, adjusts the cooperation scheme of the heterotypic nozzle of different shape factors according to the design demand of combustion chamber head, reaches the efflux penetration depth and the fuel circumference area of covering that satisfy the demand.
The invention relates to a special-shaped nozzle, which respectively achieves the purpose of reducing the generation amount of pollutants through three improvements:
the fuel jet flow injection device has the advantages that the flow area is reduced by changing the shape structure of the jet hole of the primary nozzle, so that the injection speed of the fuel jet flow is increased, the penetration depth of the jet flow is increased, the mixing area of the fuel and the air flow is increased, the mixing process between oil and gas is facilitated, the local high-temperature area of a primary outlet caused by the local enrichment of the fuel is avoided, and the effect of reducing pollution is achieved.
And secondly, changing the flow direction of the fuel oil jet by changing the arrangement angle of the jet holes of the main-stage nozzle. As shown in fig. 5, the fuel is sprayed from the inclined special-shaped nozzle to form a fuel jet surface with thickness, and the fuel is jetted into the main stage rotating airflow zone downstream or upstream, so that the contact area and the contact time of the fuel and the air are increased; as shown in FIG. 6, the fuel is sprayed out from the rotational flow special-shaped nozzle to form a rotational jet flow, so that the shearing force between the fuel and air is increased, the atomization of the fuel and the mixing process of oil gas are promoted, the fuel is distributed more uniformly in space, a local high-temperature area of a main-level outlet caused by local enrichment of the fuel is avoided, and the effect of reducing pollution is achieved.
And thirdly, the circumferential coverage area of the fuel is increased by changing the structural parameters of the spray holes of the primary nozzles, so that fuel jets formed by a plurality of nozzles distributed along the circumferential direction of the primary cyclone are matched with each other to form uniformly distributed oil mist. The circumferential coverage area of the fuel is increased by increasing the length of the long shaft of the special-shaped nozzle; as shown in fig. 7, by changing the shape of the fuel injection surface, the fuel is injected in a sector with an angle, the circumferential coverage area of the fuel is increased, and a local high-temperature region of the main-stage outlet caused by local enrichment of the fuel is avoided, so that the effect of reducing pollution is achieved.
The working process of the invention is as follows:
air from the high-pressure compressor enters the combustion chamber from the diffuser 1, and then is divided into three air flows which respectively enter the inner ring channel 7, the combustion chamber part 4 and the outer ring channel 6 of the combustion chamber. Most air enters the flame tube from the head part, and axially inflowing air passes through the head part main-stage swirler and the duty-level swirler to respectively form two rotary jet flows; the rest part of air passes through the mixing holes and the air film cooling holes on the wall surface of the flame tube from the inner and outer pipelines of the combustion chamber and enters the flame tube. The fuel is sprayed out by the fuel spray rod and forms fuel jet flow through the main-stage special-shaped nozzle and the duty-stage centrifugal nozzle respectively, and then the fuel jet flow is mixed with the rotating airflow from the swirler, and is atomized and evaporated to form an oil-gas mixture which is uniformly mixed at the head. A plurality of main-stage special-shaped nozzles are uniformly distributed along the circumferential direction, the shape coefficient of each main-stage special-shaped nozzle is greater than 1, and the formed fuel oil jet flow has large penetration depth in the radial direction and increased contact area with air flow; the jet flow has a larger expansion angle in the circumferential direction, and the jet flow space area coverage is large; the tangential direction has larger rotating speed, the disturbance between fuel and air flow is large, the mixing effect is good, the phenomenon of fuel concentration behind the primary nozzle is avoided, the temperature distribution condition is improved, and the generation amount of primary NOx is effectively reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
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| US20220316400A1 (en) * | 2021-04-02 | 2022-10-06 | Raytheon Technologies Corporation | Turbine engine fuel injector with non-circular nozzle passage |
| CN113028453B (en) * | 2021-04-09 | 2022-07-01 | 西北工业大学 | A rotary detonation combustion chamber with adjustable combustion chamber width |
| CN113137636B (en) * | 2021-04-15 | 2022-05-17 | 中国航发湖南动力机械研究所 | Double-oil-way nozzle structure |
| CN113606610B (en) * | 2021-07-27 | 2022-10-21 | 南京航空航天大学 | A Pneumatic Assisted Atomizing Direct Injection Nozzle Applied to Afterburner |
| CN114165814B (en) * | 2021-10-29 | 2023-02-10 | 南京航空航天大学 | A Multipoint Array Synergistic Direct Injection Lean Oil Staged Swirl Combustor |
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| CN1157881A (en) * | 1996-12-31 | 1997-08-27 | 天津大学 | Diesel engine fuel injection nozzle with flat orifice |
| CN103123122A (en) * | 2012-12-31 | 2013-05-29 | 南京航空航天大学 | Lean oil pre-mixing and pre-evaporating low-pollution combustion chamber capable of ejecting main-stage fuel oil directly |
| CN204114995U (en) * | 2014-07-25 | 2015-01-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of poor fuel porous spray combustion system |
| JP2019211095A (en) * | 2018-05-31 | 2019-12-12 | 株式会社日本サーモエナー | Oil-fired burners and multitube once-through boiler |
| CN110801945A (en) * | 2018-08-05 | 2020-02-18 | 大连理工大学 | Nozzle with torsional narrow slit type spray holes |
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| CN112484076A (en) | 2021-03-12 |
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