CN114060853A - Multi-stage trapezoidal tooth type mixer for integrated afterburner - Google Patents
Multi-stage trapezoidal tooth type mixer for integrated afterburner Download PDFInfo
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- CN114060853A CN114060853A CN202111460720.2A CN202111460720A CN114060853A CN 114060853 A CN114060853 A CN 114060853A CN 202111460720 A CN202111460720 A CN 202111460720A CN 114060853 A CN114060853 A CN 114060853A
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- tooth
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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
Abstract
A multi-stage trapezoidal tooth type mixer for an integrated afterburner relates to an afterburner of an aircraft engine. The mixing device is provided with two-stage mixing sections, each stage of mixing section is composed of trapezoidal tooth crown-shaped mixers with different sizes, the mixing sections are of annular structures and are sequentially named as a first-stage mixing section and a second-stage mixing section according to the sequence of flowing of culvert airflow, and the first-stage mixing section is arranged inside the second-stage mixing section; each level of mixing section comprises inner wall and the coronal blender of ladder tooth, and the interior sloping ladder tooth of the coronal blender of ladder tooth and the alternating align to grid of the camber ladder tooth are at the mixing section exit end face of each level, and when gas flowed through interior sloping ladder tooth and camber ladder tooth, the flow direction whirlpool was induced to the ladder tooth of staggered distribution, forms stable and even blending region at the rear end of the coronal blender of ladder tooth, strengthens the mixing of inside and outside ducted air current. The noise suppression device effectively suppresses the noise, effectively enhances the air flow mixing of the inner duct and the outer duct of the aircraft engine, improves the mixing efficiency, reduces the total pressure loss, and thus improves the combustion efficiency of the afterburner.
Description
Technical Field
The invention relates to an afterburner of an aircraft engine, in particular to a multi-stage trapezoidal tooth type mixer for an integrated afterburner.
Background
Afterburners are commonly used in aircraft engines, between turbines and jet nozzles, to increase engine thrust and aircraft flexibility. The afterburner mainly comprises a mixing diffuser, an oil supply device, a flame stabilizer, an igniter, an anti-vibration heat shield, an afterburner barrel and the like. A large amount of oxygen is remained in the air after the main combustion chamber is subjected to oil injection combustion, so that oil is injected again in the afterburner, and simultaneously fresh air is introduced through the mixer to be combusted again, so that a large amount of heat is released, and the thrust performance of the airplane is greatly improved.
The air current that gets into afterburner generally mixes the gas of connotation and the air of foreign culvert through the blender, thereby the effect of mixing very big degree can influence afterburner's combustion efficiency influence the thrust performance of engine. Most of the mixers used in the traditional afterburner are lobe mixers and annular mixers, the lobe mixers have good mixing effect, but cause the problems of large pressure loss, poor structural rigidity and the like, so the afterburner is suitable for engines with large bypass ratio. The total pressure loss of the annular mixer is very small, but the air flow mixing only depends on the shearing action between the inner and outer culvert air flows, and the mixing effect is very undesirable.
In recent years, relevant work of afterburner mixers is carried out at home and abroad, and a concept of a multi-stage mixer is internationally provided, and the afterburner is mainly characterized in that the internal and external culvert mixing efficiency is greatly improved by shunting and mixing air flow of an external duct step by step, but the problem that the total pressure loss is high is still not solved.
The variable-cycle aircraft engine of the next generation military warplane has extremely high requirements on the combustion efficiency and the combustion stability of the afterburner, and has low efficient mixing and total pressure loss, thereby being an important trend for the development of future mixers.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a multistage trapezoidal tooth type mixer for an integrated afterburner, which can effectively enhance the airflow mixing of inner and outer ducts of an aero-engine, improve the mixing efficiency, reduce the total pressure loss and improve the combustion efficiency of the afterburner.
The invention is provided with two stages of mixing sections, each stage of mixing section is composed of trapezoidal tooth crown-shaped mixers with different sizes, the mixing sections are of annular structures and are sequentially named as a first-stage mixing section and a second-stage mixing section according to the sequence of flowing of culvert airflow, and the first-stage mixing section is arranged in the second-stage mixing section; each level of mixing section comprises inner wall and the coronal blender of ladder tooth, and the interior sloping ladder tooth of the coronal blender of ladder tooth and the alternating align to grid of the camber ladder tooth are at the mixing section exit end face of each level, and when gas flowed through interior sloping ladder tooth and camber ladder tooth, the flow direction whirlpool was induced to the ladder tooth of staggered distribution, forms stable and even blending region at the rear end of the coronal blender of ladder tooth, strengthens the mixing of inside and outside ducted air current.
The number, size and inward and outward inclination angles of the ladder teeth are matched with the overall size of the afterburner.
In the first-stage mixing section, the total number of the ladder teeth of the ladder tooth type mixer is even, the number of the inner inclined ladder teeth and the number of the outer inclined ladder teeth are equal, the inner inclined ladder teeth are inclined inwards by 10-45 degrees, and the outer inclined ladder teeth are inclined outwards by 10-45 degrees; the height of the ladder tooth is determined by the total pressure loss of the inner culvert and the outer culvert and the mixing efficiency.
In the second-stage mixing section, the total number of the ladder teeth of the ladder tooth type mixer is even, the number of the inner inclined ladder teeth and the number of the outer inclined ladder teeth are equal, the inner inclined ladder teeth are inclined inwards by 10-45 degrees, and the outer inclined ladder teeth are inclined outwards by 10-45 degrees; the ladder tooth height is greater than the ladder tooth height in the one-level mixing section, by interior culvert total pressure loss, mixing efficiency decision.
The ratio of the distance from the inner wall of the second-stage mixing section to the inner wall of the first-stage mixing section to the distance from the afterburner cylinder can be 1: 2, and the diameters of the first-stage mixing section and the second-stage mixing section are distributed in proportion according to the overall size of the integrated afterburner under the condition that the diameter meets the strength requirement.
The invention has the following beneficial effects:
the invention uses the multi-stage ladder tooth type mixer in the integrated afterburner, and is different from different mixers in that the area of each stage of inlet of the multi-stage ladder tooth type mixer determines the bypass flow of each stage of mixing section, the flow direction vortex is generated when the air flow of the inner bypass and the outer bypass flows through the ladder tooth, the inner bypass and the outer bypass are rapidly mixed under the action of the flow direction vortex, the air flow is mixed twice, the air flow of the inner bypass and the outer bypass is uniformly mixed, the heat mixing efficiency of the mixer is improved, the uniformity of the inlet of the afterburner is greatly increased, the combustion efficiency of the afterburner is effectively improved, and the thrust performance of the aircraft engine is improved. Furthermore, the trapezoidal tooth mixer adopts a straight face, compared to the curved corrugated face of the lobe mixer, and is easy to process. The trapezoidal tooth-shaped mixer derived from the annular mixer has the characteristic of relatively small total pressure loss. Meanwhile, due to the ladder teeth, the air speed of the inner culvert is reduced, the generation of noise is effectively inhibited, the speed requirement of the inlet of the afterburner is also ensured, and the ignition performance of the afterburner is prevented from being reduced due to the fact that the inlet speed is too high. In the whole view, the performance of the afterburner in all aspects is effectively improved, and the afterburner has a very high application prospect.
Drawings
FIG. 1 is a perspective view of a ladder tooth type mixer of a first-stage blending section.
FIG. 2 is a top view of a stepped-tooth mixer of a first-stage blending section.
FIG. 3 is a perspective view of a two-stage blending section.
FIG. 4 is a schematic cross-sectional view of an integrated afterburner with a two-stage trapezoidal tooth mixer.
Fig. 5 is an enlarged view of a portion a of fig. 4.
FIG. 6 is a schematic perspective view of an afterburner with a two-stage trapezoidal tooth mixer.
Each of the labels in the figure is: 1-first-stage mixing section inner wall, 2-first-stage mixing section trapezoidal tooth type mixer, 3-second-stage mixing section inner wall, 4-second-stage mixing section trapezoidal tooth type mixer, 5-integrated afterburner cylinder, 6-afterburner central cone, 7-integrated rectification support plate stabilizer, 8-mixer inner culvert airflow inlet, 9-mixer outer culvert airflow inlet, 10-second-stage mixing section outward-inclined trapezoidal tooth and 11-second-stage mixing section inward-inclined trapezoidal tooth.
Detailed Description
The following examples will further illustrate the present invention with reference to the accompanying drawings.
The multi-stage stepped-tooth type mixer comprises two stages of mixing sections, each stage of mixing section is composed of stepped-tooth crown type mixers with different sizes, and fig. 1 and 2 are a perspective view and a top view of the stepped-tooth type mixer of the one stage of mixing section in the embodiment of the invention. The stepped-tooth crown mixer is formed by installing inner and outer inclined stepped teeth which are closely arranged on the end surface of the outlet of each stage of mixing section, and the gas induces flow direction vortexes when flowing through the staggered stepped tooth structures, so that the mixing of the gas flow of the inner duct and the gas flow of the outer duct is enhanced. The ladder tooth mixer in the first-stage blending section and the second-stage blending section is similar in structure. Referring to fig. 3, the embodiment of the present invention includes a first blending stage trapezoidal tooth type mixer and a second blending stage trapezoidal tooth type mixer. The staggered and uniform distribution of the ladder teeth 2 of the first-stage mixing section ladder tooth type mixer is on the outlet end face of the first-stage mixing section, the staggered and uniform distribution of the ladder teeth 4 of the second-stage mixing section ladder tooth type mixer is on the outlet end face of the second-stage mixing section, and the first-stage mixing section is arranged in the second-stage mixing section.
According to the invention, the length, inclination angle, quantity and geometric distribution of the tooth form, the size parameters of the inner wall surface and the outer wall surface of the two-stage mixing section and the like, the internal and external culvert airflow mixing efficiency is improved as much as possible on the premise of ensuring that the internal and external culvert areas meet the overall requirements according to the size of the afterburner. In this embodiment, the total number of the ladder teeth of the ladder tooth type mixer in the first-stage mixing section is even, the number of the inner inclined ladder teeth is equal to that of the outer inclined ladder teeth, the inner inclined ladder teeth are inclined inwards by 40 degrees, and the outer inclined ladder teeth are inclined outwards by 40 degrees; on the premise of meeting the internal and external culvert area, the height of the outward-inclined ladder teeth is determined by the distance between the inner wall and the outer wall of the first-stage mixing section, and the height of the outward-inclined ladder teeth is more than 60% of the distance between the inner wall and the outer wall of the first-stage mixing section. The height of the inward-inclined ladder teeth is as large as possible on the premise of ensuring that the total pressure loss is small.
The total number of the ladder teeth of the ladder tooth type mixer in the second-stage mixing section is even, the number of the inner inclined ladder teeth is equal to that of the outer inclined ladder teeth, the inner inclined ladder teeth are inclined inwards by 40 degrees, and the outer inclined ladder teeth are inclined outwards by 40 degrees; the height of the ladder teeth is larger than that of the ladder teeth in the primary mixing section, on the premise of meeting the inner and outer culvert area, the height of the outward-inclined ladder teeth is determined by the distance between the inner wall of the secondary mixing section and the afterburner cylinder, and the height of the outward-inclined ladder teeth is more than 60% of the distance between the inner wall of the secondary mixing section and the afterburner cylinder. The height of the inward-inclined ladder teeth is as large as possible on the premise of ensuring that the total pressure loss is small. To improve mixing efficiency.
The ratio of the distance from the inner wall of the second-stage mixing section to the inner wall of the first-stage mixing section to the distance from the inner wall of the integrated afterburner cylinder can be 1: 2, and the diameters of the first-stage mixing section and the second-stage mixing section are distributed in proportion according to the overall size of the integrated afterburner under the condition that the diameter meets the strength requirement.
The embodiment of the invention provides a multi-stage trapezoidal tooth type mixer for an integrated afterburner, which can effectively strengthen the air flow mixing of inner and outer ducts of an aero-engine and relatively reduce the total pressure loss in the mixing process. Fig. 4 is a schematic sectional view of an integrated afterburner with a multi-stage trapezoidal tooth type mixer, fig. 5 is a partially enlarged view of a trapezoidal tooth of a portion a in fig. 4, inner inclined trapezoidal teeth 11 and outer inclined trapezoidal teeth 10 are alternately arranged, and fig. 6 is a schematic perspective view of the afterburner with a two-stage trapezoidal tooth type mixer.
The installation distribution of the multistage stepped tooth type mixers is mainly used for determining the positions of the multistage stepped tooth type mixers, the position of an integrated afterburner cylinder 5 is installed according to the specific size of an engine, the ratio of the distance from a second-stage mixing section inner wall 3 to a first-stage mixing section inner wall 1 to the distance from the integrated afterburner cylinder 5 can be 1: 2, the specific positions of the second-stage mixing section inner wall 3 and the first-stage mixing section inner wall 1 are determined according to the requirement of the pneumatic area of the inward flow, the position of an afterburner central cone 6 is determined according to the first-stage mixing section inner wall 1, and an integrated rectifying support plate stabilizer 7 is located between the first-stage mixing section inner wall 1 and the afterburner central cone 6. The first-stage mixing section stepped tooth crown mixer 2 is arranged on the outlet end face of the first-stage mixing section, and the second-stage mixing section stepped tooth crown mixer 4 is arranged on the outlet end face of the second-stage mixing section.
When the culvert gas flows in from the inner culvert gas flow inlet 9 of the mixer and flows through the two-stage mixing section, the culvert gas flow is divided into two parts and flows into the first-stage mixing section and the second-stage mixing section respectively. The air current of flowing through one-level mixing section takes precedence and the gas that mixer connotative airflow inlet 8 flowed into takes place the mixing, and the air current of flowing through one-level mixing section and the gas of connotative produce very strong stable flow direction whirlpool when flowing through one-level mixing section ladder tooth type blender, and the air current of one-level mixing section and the gaseous emergence of connotative mix violently under the effect that flows to the whirlpool form stable and even blending region in one-level mixing section ladder tooth crown mixer rear end.
The gas after the primary mixing is mixed with the culvert gas flowing into the secondary mixing section again when flowing through the secondary mixing section, strong and stable flow direction vortex is generated when flowing through the trapezoidal tooth type mixer of the secondary mixing section, the gas flow of the secondary mixing section is violently mixed with the culvert gas under the action of the flow direction vortex,
under the action of flow direction vortexes generated by the two-stage mixing section, the distribution of parameters such as the temperature and the speed of the mixed air flow is more uniform, and the inlet condition of the afterburner is greatly improved, so that the combustion efficiency of the afterburner is improved, the noise generated by the engine is reduced, and the performance of the engine can be further improved.
The invention is provided with two stages of mixing sections, each section consists of staggered trapezoidal tooth crown-shaped mixers with different sizes, and on one hand, the outer culvert airflow is mixed with the inner culvert airflow twice, so that the inner culvert airflow and the outer culvert airflow are mixed uniformly to a greater extent. On the other hand, when the airflow flows through the ladder teeth, strong and stable flow direction vortexes are generated, and a stable and uniform mixing area is formed at the rear end of the mixer. The staggered stepped-tooth crown mixer is derived from the structural change of the annular mixer and is formed by installing closely arranged stepped teeth at the tail edge of the annular mixer, and the stepped teeth have small area and small blocking area to flow. The staggered ladder-tooth-shaped mixer inherits the characteristic of small total pressure loss of the annular mixer, can effectively enhance the air flow mixing of the inner duct and the outer duct of the aero-engine, improves the mixing efficiency, and reduces the total pressure loss, thereby improving the combustion efficiency of the afterburner, and ensuring the stable combustion of the afterburner and good inlet conditions of the afterburner; and after multistage mixing, mixing efficiency is not lower than lobe blender and other commonly used blenders, and crisscross ladder tooth blender simple structure in addition, processing is convenient, uses in the engineering and has very big advantage.
Claims (8)
1. A multi-stage stepped tooth type mixer for an integrated afterburner is characterized by being provided with two stages of mixing sections, wherein each stage of mixing section is composed of stepped tooth crown-shaped mixers with different sizes, the mixing sections are of annular structures and are sequentially named as a first-stage mixing section and a second-stage mixing section according to the sequence of flowing of bypass airflow, and the first-stage mixing section is arranged inside the second-stage mixing section; each level of mixing section comprises inner wall and the coronal blender of ladder tooth, and the interior sloping ladder tooth of the coronal blender of ladder tooth and the alternating align to grid of the camber ladder tooth are at the mixing section exit end face of each level, and when gas flowed through interior sloping ladder tooth and camber ladder tooth, the flow direction whirlpool was induced to the ladder tooth of staggered distribution, forms stable and even blending region at the rear end of the coronal blender of ladder tooth, strengthens the mixing of inside and outside ducted air current.
2. The multi-stage ladder tooth type mixer for an integrated afterburner as claimed in claim 1, wherein the number, size and inward and outward inclination angles of the ladder teeth are adapted to the overall size of the afterburner.
3. The multistage stepped-tooth mixer for an integrated afterburner as claimed in claim 1, wherein in the primary blending section, the total number of the stepped teeth of the stepped-tooth mixer is even, the number of the inward-inclined stepped teeth and the outward-inclined stepped teeth are equal, the inward-inclined stepped teeth are inclined inward by 10 to 45 degrees, and the outward-inclined stepped teeth are inclined outward by 10 to 45 degrees; the height of the ladder tooth is determined by the total pressure loss of the inner culvert and the outer culvert and the mixing efficiency.
4. The multi-stage stepped-tooth mixer for an integrated afterburner as claimed in claim 3 wherein said inwardly sloping teeth are inclined inwardly at 25 ° to 40 ° and said outwardly sloping teeth are inclined outwardly at 25 ° to 40 °.
5. The multistage stepped-tooth mixer for an integrated afterburner as claimed in claim 1, wherein in the secondary blending section, the total number of the stepped teeth of the stepped-tooth mixer is even, the number of the inward-inclined stepped teeth and the outward-inclined stepped teeth are equal, the inward-inclined stepped teeth are inclined inward by 10 ° to 45 °, and the outward-inclined stepped teeth are inclined outward by 10 ° to 45 °; the ladder tooth height is greater than the ladder tooth height in the one-level mixing section, by interior culvert total pressure loss, mixing efficiency decision.
6. The multi-stage stepped-tooth mixer for an integrated afterburner as claimed in claim 5 wherein said inwardly sloping teeth are inclined inwardly at 25 ° to 40 ° and said outwardly sloping teeth are inclined outwardly at 25 ° to 40 °.
7. The multi-stage stepped-tooth mixer for an integrated afterburner according to claim 1, wherein the ratio of the distance from the inner wall of the second-stage blending section to the inner wall of the first-stage blending section to the distance from the afterburner barrel is 1: 2.
8. The multi-stage trapezoidal tooth type mixer for the integrated afterburner as claimed in claim 1, wherein the diameters of the primary blending section and the secondary blending section are proportioned according to the overall size of the integrated afterburner under the condition of meeting the strength requirement.
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| CN202111460720.2A CN114060853B (en) | 2021-12-02 | 2021-12-02 | Multi-stage trapezoidal tooth type mixer for integrated afterburner |
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| CN202111460720.2A CN114060853B (en) | 2021-12-02 | 2021-12-02 | Multi-stage trapezoidal tooth type mixer for integrated afterburner |
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