阅读说明：本技术 一种复合冲击气膜冷却壁式火焰稳定器及燃烧室 (Composite impact air film cooling wall type flame stabilizer and combustion chamber ) 是由 范育新 陈玉乾 毕亚宁 陶华 黄学民 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种复合冲击气膜冷却壁式火焰稳定器及燃烧室。所述壁式火焰稳定器包括水平延伸的导流板、前气冷斜板、气冷平板、后气冷斜板以及设置在所述后气冷斜板后端的油冷分流板；所述前气冷斜板、气冷平板以及后气冷斜板中空形成相互连通的气冷腔体,所述气冷腔体被分隔成第一腔体以及位于所述第一腔体下方的第二腔体；所述油冷分流板上设置有燃油引管；所述油冷分流板中空形成油冷蒸发腔。本发明在壁式稳定器凹腔区域组合使用冲击冷却和气膜冷却,在其火焰尾迹辐射的分流板内部使用油冷,有效地降低稳定器热侧壁面温度,提高稳定器在高温燃气中的寿命。(The invention discloses a composite impact air film cooling wall type flame stabilizer and a combustion chamber. The wall type flame stabilizer comprises a guide plate, a front air-cooling inclined plate, an air-cooling flat plate, a rear air-cooling inclined plate and an oil-cooling flow distribution plate, wherein the guide plate extends horizontally; the front air-cooling inclined plate, the air-cooling flat plate and the rear air-cooling inclined plate are hollow to form air-cooling cavities which are communicated with each other, and the air-cooling cavities are divided into a first cavity and a second cavity which is positioned below the first cavity; the oil-cooling flow distribution plate is provided with a fuel oil guide pipe; the oil cooling flow distribution plate is hollow to form an oil cooling evaporation cavity. The invention combines impingement cooling and air film cooling in the concave cavity area of the wall type stabilizer, and uses oil cooling in the splitter plate radiated by the flame trail, thereby effectively reducing the temperature of the hot side wall surface of the stabilizer and prolonging the service life of the stabilizer in high-temperature fuel gas.)

1. The composite impact gas film cooling wall type flame stabilizer (1) is characterized in that the wall type flame stabilizer (1) comprises a guide plate (2) extending horizontally, a front air-cooling inclined plate (3) arranged at the rear end of the guide plate (2), an air-cooling flat plate (4) arranged at the rear end of the front air-cooling inclined plate (3), a rear air-cooling inclined plate (5) arranged at the rear end of the air-cooling flat plate (4) and an oil-cooling splitter plate (6) arranged at the rear end of the rear air-cooling inclined plate (5); a lower concave cavity (11) is formed among the front air-cooling inclined plate (3), the air-cooling flat plate (4) and the rear air-cooling inclined plate (5), the front air-cooling inclined plate (3), the air-cooling flat plate (4) and the rear air-cooling inclined plate (5) are hollow to form an air-cooling cavity (12) which is communicated with each other, the air-cooling cavity (12) is divided into a first cavity (121) and a second cavity (122) which is positioned below the first cavity (121), the first cavity (121) is communicated with a first air-cooling lead pipe (7), and the first cavity (121) is communicated with the second cavity (122) through a plurality of air film holes; the second cavity (122) is communicated with the lower cavity (11) through a plurality of air film holes, and an igniter (8) is arranged on the air-cooled flat plate (4); a fuel oil guide pipe (10) is arranged on the oil cooling flow distribution plate (6); the oil cooling distribution plate (6) is hollow to form an oil cooling evaporation cavity (601), a fuel injection hole (602) communicated with the lower cavity (11) is formed in the side, close to the lower cavity (11), of the oil cooling evaporation cavity (601), and the fuel guide pipe (10) is communicated with the oil cooling evaporation cavity (601).

2. The composite impingement air film cooling wall type flame stabilizer according to claim 1, wherein the first cold air guide pipe (7) is arranged at the connecting top corner of the front air cooling inclined plate (3) and the air cooling flat plate (4); and a second cold air guide pipe (9) is arranged at the joint of the rear air-cooling inclined plate (5) and the air-cooling flat plate (4).

3. The composite impingement air film cooled wall flame stabilizer according to claim 1, wherein the front air cooled inclined plate (3) is hollow inside and is divided into a first layer air cooled cavity (302) and a second layer air cooled cavity (303) by a first partition plate (301); the first side wall (304) of the front air-cooling inclined plate (3) close to one side of the lower cavity (11) is uniformly provided with first air film holes (305) which are arranged in a cross mode, and the first partition plate (301) is uniformly provided with first air-cooling impact holes (306) which are perpendicular to the wall of the first partition plate (301) and are arranged in a cross mode.

4. The composite impingement film cooled wall flame holder of claim 3, wherein the angle between the front gas-cooled inclined plate (3) and the gas-cooled flat plate (4) is 120 °; the included angle between the first air film hole (305) and the first hot side wall surface (304) is 30 degrees; and/or the first film holes (305) are staggered with the first air-cooled impingement holes (306).

5. The composite impingement film cooled wall flame holder of claim 1 wherein the air cooled plate (4) is hollow inside and separated by a second partition (401) into a third layer of air cooled cavity (402) and a fourth layer of air cooled cavity (403); second air film holes (406) which are arranged in a cross mode are uniformly formed in a second hot side wall surface (405) of the air-cooling flat plate (4) close to one side of the lower cavity (11), and second air-cooling impact holes (407) which are perpendicular to the wall surface of the second partition plate (401) and are arranged in a cross mode are uniformly formed in the second partition plate (401).

6. The composite impingement film cooled wall flame holder of claim 5 wherein the second film hole (406) is at a 30 ° angle to the second hot side wall (405); and/or the first film holes (406) are staggered with the second air-cooled impingement holes (407).

7. The composite impingement air film cooling wall type flame stabilizer of claim 1, wherein the rear air cooling inclined plate (5) is internally hollow and divided into a fifth layer air cooling cavity (502) and a sixth layer air cooling cavity (503) by a third clapboard (501); third air film holes (505) which are arranged in a cross mode are uniformly formed in a third hot side wall surface (504) of the air-cooling flat plate (5) close to one side of the lower concave cavity (11), and third air-cooling impact holes (506) which are perpendicular to the wall surface of the third partition plate (501) and are arranged in a cross mode are uniformly formed in the third partition plate (501).

8. The composite impingement film cooled wall flame holder of claim 7 wherein the third film hole (505) is at a 30 ° angle to the third hot side wall (504); and/or the air film holes (505) and the air cooling impact holes (506) are staggered.

9. The composite impingement film cooled wall flame holder of claim 2 wherein the angle between the baffle (2) and the front gas-cooled inclined plate (3) is 60 °; the included angle between the air-cooled flat plate (4) and the rear air-cooled inclined plate (5) is 150 degrees; the oil-cooling splitter plate (6) and the air-cooling flat plate (4) are arranged in parallel; the gas outlet of the first cold gas guide pipe (7) is uniformly divided by the connecting vertex angle of the front gas cooling inclined plate (3) and the gas cooling flat plate (4); the gas outlet of the second cold gas guide pipe (9) is evenly divided by the connecting vertex angle of the gas cooling flat plate (4) and the rear gas cooling inclined plate (5).

10. A combustion chamber comprising a wall flame holder (1) according to claim 1.

Technical Field

The invention relates to the technical field of an aviation power propulsion system, in particular to a composite impact air film cooling wall type flame stabilizer and a combustion chamber.

Background

With the increasing requirements of modern advanced aircrafts on the maximum thrust and maneuverability of the engine, the temperature rise requirement of the thrust enhancement device is increased gradually, which brings new challenges to the design of each key hot end component. At present, the conventional material used for hot-end parts of aircraft engines is high-temperature alloy, the temperature resistance limit of which is below 1200-1300K, however, it is foreseeable that, with the development of advanced afterburners/ramjets in the future, the wall temperature of the flame stabilizer in the high-temperature flame will be far higher than this temperature, and the heat protection design of the hot-side wall of the flame stabilizer also necessarily becomes a key part. In addition, advanced aircraft engine afterburners and ramjet combustors are increasingly high in inlet velocity, and flame stabilization devices for the combustors need to be optimized for efficient, reliable and stable combustion organization.

Currently, the cooling techniques commonly used in aircraft engines mainly include both air cooling and oil cooling. Among them, the conventional air cooling technology mainly includes film cooling, impingement cooling, jet cooling, and the like. In advanced afterburners, flame stabilizers widely used in the past decades include bluff body flame stabilization, evaporative flame stabilizers, integrated flame stabilizers, and wall flame stabilizers, among others. The wall-type flame stabilizer can be used for generating a larger low-speed backflow area so as to realize better ignition performance and flame stability, and can be used for on-duty ignition in an afterburner or a combined engine multi-mode combustor and can also be used for tissue combustion in a ramjet combustor. In order to realize the high-efficiency cooling of the wall type flame stabilizer on the hot side wall surface, the cold air can be separately introduced from the compressor to cool the wall type flame stabilizer. In addition, the fuel supply scheme of the wall-type flame stabilizer can be optimized, low-temperature fuel is fully utilized to cool partial area of the stabilizer, the fuel temperature is increased, the evaporation effect of fuel jet flow is improved, and the ignition and flame stability performance of the stabilizer are improved.

Disclosure of Invention

The purpose of the invention is as follows: the invention provides a composite impact air film cooling wall type flame stabilizer which can reduce the temperature of all hot side wall surfaces in contact with flame, realize the active control on the cooling effect and the flame of a concave cavity, simultaneously obtain better ignition and flame stabilization performance, solve the defects that the ignition and the flame stabilization are difficult in high-temperature high-speed incoming flow, and the temperature of the hot side wall surfaces in direct contact with the flame exceeds the temperature resistance limit of the conventional high-temperature alloy and needs to be subjected to thermal protection, and ensure the working reliability of the flame stabilizer. The invention also provides a combustion chamber containing the wall type flame stabilizer.

The technical scheme is as follows: a composite impact air film cooling wall type flame stabilizer comprises a guide plate, a front air cooling inclined plate, an air cooling flat plate, a rear air cooling inclined plate and an oil cooling splitter plate, wherein the guide plate extends horizontally; a lower concave cavity is formed among the front air-cooling inclined plate, the air-cooling flat plate and the rear air-cooling inclined plate, the front air-cooling inclined plate, the air-cooling flat plate and the rear air-cooling inclined plate are hollow to form air-cooling cavities which are communicated with each other, the air-cooling cavities are divided into a first cavity and a second cavity which is positioned below the first cavity, the first cavity is communicated with a first cold air guide pipe, and the first cavity and the second cavity are communicated through a plurality of air film holes; the second cavity is communicated with the lower concave cavity through a plurality of air film holes, and an igniter is arranged on the air cooling flat plate; the oil-cooling flow distribution plate is provided with a fuel oil guide pipe; the oil cooling distribution plate is hollow to form an oil cooling evaporation cavity, a fuel injection hole communicated with the lower concave cavity is formed in the side, close to the lower concave cavity, of the oil cooling evaporation cavity, and the fuel guide pipe is communicated with the oil cooling evaporation cavity.

The first cold air guide pipe is arranged at the connecting vertex angle of the front air-cooling inclined plate and the air-cooling flat plate; and a second cold air guide pipe is arranged at the joint of the rear air-cooling inclined plate and the air-cooling flat plate.

The front air-cooling inclined plate is hollow and is divided into a first layer of air-cooling cavity and a second layer of air-cooling cavity by a first partition plate; the first side wall surface of the front air-cooling inclined plate, which is close to one side of the lower concave cavity, is uniformly provided with first air film holes which are arranged in a cross mode, and the first partition plate is uniformly provided with first air-cooling impact holes which are perpendicular to the wall surface of the first partition plate and are arranged in a cross mode.

The included angle between the front air-cooling inclined plate and the air-cooling flat plate is 120 degrees; the included angle between the first air film hole and the wall surface of the first hot side is 30 degrees; and/or the first air film holes and the first air cooling impact holes are staggered.

The air-cooling flat plate is hollow and is divided into a third layer of air-cooling cavity and a fourth layer of air-cooling cavity by a second partition plate; and second air film holes which are arranged in a cross way are uniformly formed in the wall surface of the second hot side of the air-cooled flat plate, which is close to one side of the lower concave cavity, and second air-cooled impact holes which are arranged in a cross way and are vertical to the wall surface of the second partition plate are uniformly formed in the second partition plate.

The included angle between the second air film hole and the wall surface of the second hot side is 30 degrees; and/or the first air film holes and the second air cooling impact holes are staggered.

The rear air-cooling inclined plate is internally hollow and is divided into a fifth layer air-cooling cavity and a sixth layer air-cooling cavity by a third partition plate; third air film holes which are arranged in a cross mode are uniformly formed in the wall surface of a third hot side, close to one side of the lower concave cavity, of the air cooling flat plate, and third air cooling impact holes which are perpendicular to the wall surface of the third partition plate and are arranged in a cross mode are uniformly formed in the third partition plate.

The included angle between the third air film hole and the wall surface of the third hot side is 30 degrees; and/or the air film holes and the air cooling impact holes are staggered.

The included angle between the guide plate and the front air-cooling inclined plate is 60 degrees; the included angle between the air-cooled flat plate and the rear air-cooled inclined plate is 150 degrees; the oil-cooling flow distribution plate and the air-cooling flat plate are arranged in parallel; the gas outlet of the first cold gas guide pipe is uniformly divided by the connecting vertex angle of the front gas cooling inclined plate and the gas cooling flat plate; and the gas outlet of the second cold gas guide pipe is uniformly divided by the connecting vertex angle of the gas cooling flat plate and the rear gas cooling inclined plate.

The invention also provides a combustion chamber comprising the wall type flame stabilizer.

Has the advantages that: (1) according to the invention, by adopting a composite impact air film cooling technology for a high-temperature flame area in the cavity of the wall-type flame stabilizer, the wall surface of the hot side of the cavity can be effectively cooled, the cold air jet flow sprayed by the arranged air film hole can accelerate the mass exchange between the interior of the cavity and a main flow below the cavity, the fuel atomization and evaporation rate in the cavity are improved, the ignition and flame stability performance of the cavity is further improved, and the active control on the cooling effect and the flame in the cavity can be realized by a mode of independently introducing air from the outer wall; (2) according to the invention, the fuel supply coupling is designed on the splitter plate of the stabilizer, so that the wall surface above the high-temperature flame can be effectively cooled, the heat radiated by the flame on the wall surface can be fully utilized to increase the temperature before fuel injection, accelerate the evaporation rate of the fuel after entering the concave cavity and enhance the ignition and flame stabilization capability; (3) in addition, the composite impact air film cooling wall type flame stabilizer not only can be used for ignition on duty in an afterburner and a multi-mode combustor, but also can be used for organized combustion in a stamping combustor; (4) according to the invention, through the design that two paths of air entraining agents arranged at the connecting top corner are uniformly dispersed to three plates, the temperature uniformity of the cooled wall surface can be improved.

Drawings

FIG. 1 is a schematic view of a composite impingement film cooled wall flame holder of the present invention;

FIG. 2 is a partial view of the composite impingement film cooled wall flame holder pocket area of the present invention;

FIG. 3 is a schematic view of an afterburner assembled with a composite impingement film cooled wall flame stabilizer;

FIG. 4 is a schematic view of a ram combustor equipped with a composite impingement film cooled wall flame holder.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the technical solutions of the present invention will be further described with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the direction in which the X axis extends is the direction of the incoming flow, which is also the front-to-back direction in the present invention, and the direction in which the Y axis extends is the direction from the bottom to the top, which is also the radial direction in the present invention. The invention relates to a composite impact air film cooling wall type flame stabilizer 1 which comprises a guide plate 2, a front air cooling inclined plate 3, an air cooling flat plate 4, a rear air cooling inclined plate 5, an oil cooling flow distribution plate 6, a first air cooling guide pipe 7, an igniter 8, a second air cooling guide pipe 9 and a fuel oil guide pipe 10.

The guide plate 2 extends horizontally and is installed in parallel facing the incoming flow. The front air-cooling inclined plate 3 is arranged at the rear end of the guide plate 2, and the included angle between the guide plate 2 and the front air-cooling inclined plate 3 is 60 degrees. The air-cooling flat plate 4 is parallel to the guide plate 2 and is arranged at the rear end of the front air-cooling inclined plate 3. The rear air-cooling inclined plate 5 is arranged at the rear end of the air-cooling flat plate 4, and the included angle between the rear air-cooling inclined plate 5 and the air-cooling flat plate 4 is 150 degrees. The oil-cooling flow distribution plate 6 is arranged at the rear end of the rear air-cooling inclined plate 5 and is parallel to the air-cooling flat plate 4. The front air-cooled inclined plate 3 extends upwards in an inclined mode along the incoming flow direction, the rear air-cooled inclined plate 5 extends downwards in an inclined mode along the incoming flow direction, and the front air-cooled inclined plate 3, the air-cooled flat plate 4 and the rear air-cooled inclined plate 5 are sequentially connected to form a concave cavity 11 protruding upwards and used for generating a low-speed backflow area to achieve reliable ignition and flame stability. The front air-cooling inclined plate 3, the air-cooling flat plate 4 and the rear air-cooling inclined plate 5 are respectively hollow to form air-cooling cavities 12 which are communicated with each other, the air-cooling cavities 12 are divided into a first cavity 121 and a second cavity 122 which is positioned below the first cavity 121 by a partition plate, the first cavity 121 and the second cavity 122 are communicated with each other through a plurality of air film holes, the air film holes are arranged on the partition plate, and the opening directions of the air film holes are vertical to the plane of the partition plate; the second cavity 122 is communicated with the lower cavity 11 through a plurality of air film holes. The gas film holes arranged below the second cavity 122 are respectively distributed on the lower wall surfaces of the front gas-cooled inclined plate 3, the gas-cooled flat plate 4 and the rear gas-cooled inclined plate 5, the opening direction of the gas film holes distributed on the lower wall surface of the front gas-cooled inclined plate 3 is parallel to the extending direction of the Y axis, and an angle of 30 degrees is formed between the opening direction and the plane where the front gas-cooled inclined plate 3 is located. The opening direction of the air film hole arranged on the lower wall surface of the air cooling flat plate 4 forms an angle of 30 degrees with the plane where the air cooling flat plate 4 is positioned, and the air film hole extends forwards in an inclined manner; the opening direction of the air film hole arranged on the lower wall surface of the rear air-cooled inclined plate 5 forms an included angle of 30 degrees with the plane of the rear air-cooled inclined plate 5 and is parallel to the extension direction of the X axis.

The air-cooling cavity 12 is at least provided with one air-cooling air-guiding pipe for guiding the external air-cooling air into the air-cooling cavity, in this embodiment, a first air-cooling guiding pipe 7 is arranged at a vertex angle where the front air-cooling inclined plate 3 and the air-cooling flat plate 4 are connected, a second air-cooling air-guiding pipe 9 is arranged at a vertex angle where the air-cooling flat plate 4 and the rear air-cooling inclined plate 5 are connected, and the two air-guiding pipes are divided into two parts by the vertex angle. The cold air introduced from the first cold air introducing pipe 7 passes through the vertex angle and then enters the cavity of the front air-cooling inclined plate 3 and the cavity of the air-cooling flat plate 4 in two paths, and similarly, the cold air introduced from the second cold air introducing pipe 9 passes through the vertex angle and then enters the cavity of the air-cooling flat plate 4 and the cavity of the rear air-cooling inclined plate 5 in two paths, so that the temperature uniformity of the cooled wall surface can be improved.

A fuel oil guide pipe 10 is vertically installed at the right end of the oil cooling flow distribution plate 6 and used for supplying oil, the oil cooling flow distribution plate 6 is hollow to form an oil cooling evaporation cavity 601, a fuel oil injection hole 602 communicated with the lower concave cavity 11 is formed in the side, close to the lower concave cavity 11, of the oil cooling evaporation cavity 601, and the fuel oil guide pipe 10 is communicated with the oil cooling evaporation cavity 601.

As shown in fig. 2, the front air-cooled swash plate 3 is internally divided into two layers of air-cooled cavities by a first partition plate 301, namely a first air-cooled cavity 302 and a second air-cooled cavity 303, the air-cooled flat plate 4 is internally divided into two layers of air-cooled cavities by a second partition plate 401, namely a third air-cooled cavity 402 and a fourth air-cooled cavity 403, the rear air-cooled swash plate 5 is internally divided into two layers of air-cooled cavities by a third partition plate 501, namely a fifth air-cooled cavity 502 and a sixth air-cooled cavity 503, and the air-cooled cavities are communicated with each other. The wall surface of the front air-cooling inclined plate 3 close to the lower cavity 11 is a first hot side wall surface 304, first air film holes 305 which are arranged in a crossed manner and form an included angle of 30 degrees with the first hot side wall surface are uniformly formed in the first hot side wall surface 304 along the anticlockwise direction, and first air-cooling impact holes 306 which are perpendicular to the wall surface of the first partition plate 301 and are arranged in a crossed manner are uniformly formed in the first partition plate 301. The wall surface of the air-cooled flat plate 4 close to the lower cavity 11 is a second hot side wall surface 405, second air film holes 406 which are arranged in a cross way and form an included angle of 30 degrees with the second hot side wall surface are uniformly formed in the second hot side wall surface 405 along the anticlockwise direction, and second air-cooled impact holes 407 which are arranged in a cross way and are vertical to the wall surface of the second partition plate 401 are uniformly formed in the second partition plate 401. The wall surface of the rear air-cooling sloping plate 5 close to the lower cavity 11 is a third hot side wall surface 504, third air film holes 505 which are arranged in a cross way and form an included angle of 30 degrees with the wall surface of the third hot side wall surface 504 are uniformly formed in the third hot side wall surface 504 along the anticlockwise direction, and third air-cooling impact holes 506 which are perpendicular to the wall surface of the third partition plate 301 and are arranged in a cross way are uniformly formed in the third partition plate 301. The first air film hole 305, the second air film hole 406 and the third air film hole 505 are respectively arranged in a staggered manner with the first air-cooled impact hole 306, the second air-cooled impact hole 407 and the third air-cooled impact hole 506, so that the impact air film composite cooling effect is realized.

An igniter 8 is arranged in the middle of the air-cooling flat plate 4 and used for ignition, a mounting hole is formed in the position, where the igniter 8 is arranged, on the air-cooling flat plate 4, and the interiors of the third air-cooling cavity 402 and the fourth air-cooling cavity 403 are isolated from the igniter 8 by a bushing, so that air leakage is prevented.

The oil-cooled splitter plate 6 is hollowed to form an oil-cooled evaporation cavity 601, the oil-cooled evaporation cavity 601 is isolated from the air-cooled cavity 12, a fuel jet hole 602 which forms an angle of 30 degrees with the wall of the rear air-cooled inclined plate is formed in the left end wall surface of the oil-cooled splitter plate 6, the fuel jet hole 602 is used for sending fuel entering the oil-cooled evaporation cavity 601 into the lower cavity 11, the fuel passes through the oil-cooled evaporation cavity 601 to cool the oil-cooled splitter plate and simultaneously increase the temperature of the fuel, and the fuel cooling stabilizer is fully utilized to improve the evaporation effect of the fuel jet.

The composite impact air film cooling wall type flame stabilizer can be used for on-duty ignition in an afterburner and a multi-mode combustor and can also be used for combined combustion in a stamping combustor.

When the composite impact air film cooling wall type flame stabilizer is used for an afterburner, the composite impact air film cooling wall type flame stabilizer can be used for ignition on duty. As shown in fig. 3, the baffle 2 of the wall flame stabilizer 1 can divide the internal and external content of the afterburner into two channels, namely an upper channel and a lower channel. The cold air introduced by the compressor enters the first cavity 121 (i.e. the first air-cooling cavity 302, the third air-cooling cavity 402 and the fifth air-cooling cavity 502) inside the front air-cooling inclined plate 3, the air-cooling flat plate 4 and the rear air-cooling inclined plate 5 through the first cold air guide pipe 7 and the second cold air guide pipe 9, then is sprayed into the second air-cooling cavity 303, the fourth air-cooling cavity 403 and the sixth air-cooling cavity 503 through the first air-cooling impact hole 306, the second air-cooling impact hole 407 and the third air-cooling impact hole 506, and impacts and cools the first hot side wall 304, the second hot side wall 405 and the third hot side wall 504 of the three air-cooling plates, and finally enters the lower cavity 11 through the first air film hole 305, the second air film hole 406 and the third air film hole 505 which are formed in an angle of 30 degrees with the hot side wall counterclockwise. The cold air sprayed by the air film hole flows tangentially in a main flow backflow area in the lower cavity 11, a layer of cold air film is formed in a near-wall area, the flame in the cavity can ablate the wall surface of the hot side, the temperature of the wall of the hot side is reduced, and efficient cooling is realized. In addition, the cold air sprayed by the air film hole can accelerate the flow of a backflow area in the concave cavity to a certain degree, namely, the mass exchange rate of the fuel gas and the main flow in the concave cavity is improved, so that the combustion atomization and evaporation rate of the concave cavity is improved, and the ignition and flame stability performance is improved. Because the flame below the oil-cooled splitter plate 6 directly contacts the wall surface of the oil-cooled splitter plate 6 and the wall surface is easy to ablate, the invention enables low-temperature fuel oil to enter the oil-cooled evaporation cavity 601 of the oil-cooled splitter plate 6 through the fuel oil guide pipe 10, the fuel oil is heated and heated by heat transferred from the hot side of the splitter plate while cooling the splitter plate 6, and finally the fuel oil is injected into the cavity through the area at the beginning of the cavity backflow, the evaporation rate of the heated fuel oil is improved, and the evaporation and mixing effects of the cavity can be enhanced along with the long-time stay of the backflow area. Finally, under the mode of comprehensively using external introduced cold air and fully utilizing an oil supply system, not only are the plates on the wall type stabilizer in direct contact with the flame comprehensively cooled, but also the active control on the cooling effect and the flame in the cavity can be realized, and better ignition and flame stabilization performances are obtained.

When the wall type flame stabilizer 1 of the invention is used for a ram combustion chamber, as shown in fig. 4, the cooling and oil supply technology can realize the same principle and effect as when used for an afterburner. The main difference is that the guide plate 2 and the oil-cooled splitter plate 6 are integrated into the outer wall of the ram combustion chamber.

The wall type flame stabilizer of the invention improves the fuel temperature, improves the fuel evaporation effect and improves the ignition performance and the flame stability of the wall type flame stabilizer. The invention has simple structure and can realize the active control of the cooling effect and the flame in the concave cavity by controlling the flow of the cooling gas.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, and the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and principles of the invention.