Afterburner hydrogen-kerosene dual-fuel cavity support plate flame stabilizer

Abstract

The afterburner hydrogen-kerosene dual-fuel concave cavity supporting plate flame stabilizer comprises a plurality of supporting plates evenly arranged in an outer culvert casing, concave cavities are formed in the sides, away from gas incoming flow, of the supporting plates, the concave cavities are closed through hydrogen injection pieces, the hydrogen injection pieces are provided with splitter plates stretching into the concave cavities, and the splitter plates are connected with the outer culvert casing. The supporting plate is provided with an air entraining inlet penetrating through the air entraining flow channel and an exhaust outlet penetrating through the exhaust flow channels, the supporting plate is provided with a main combustion stage kerosene injection pipe and an on-duty stage kerosene injection pipe which extend into the air entraining flow channel, and the side of the supporting plate is provided with a low-speed backflow area. The main combustion stage kerosene nozzle is located in a low-speed backflow area. Combustion of double fuels of hydrogen and kerosene in the afterburner is achieved, on one hand, the working efficiency of the gas compressor is improved, and combustion is promoted; on the other hand, kerosene serves as an afterburner on-duty stage, hydrogen serves as a working stage, hydrogen ignition is facilitated, and the afterburner can be stably started.

Description

A hydrogen-kerosene dual-fuel concave cavity flame stabilizer for an afterburner Technical Field

[0001] This invention relates to the field of aerospace technology, and more particularly to a hydrogen-kerosene dual-fuel concave cavity flame stabilizer for an afterburner. Background Technology

[0002] The afterburner is a crucial short-term thrust-enhancing device for aero-engines. In the pursuit of high thrust-to-weight ratios in aero-engines, the equivalence ratio of the combustor is continuously increasing. This leads to higher inlet duct temperatures and faster flow velocities in the afterburner. Traditional afterburner components operate relatively independently, resulting in significant flow losses. To reduce non-afterburning losses such as flow losses and improve combustion performance, the idea of ​​coupling two or more components, such as fuel nozzles, support plates, mixers, and stabilizers, has become a key development direction for combustion organization in new afterburners both domestically and internationally. This integrated design effectively reduces the number of combustor parts, lightens engine weight, and improves the engine's thrust-to-weight ratio.

[0003] However, since the distance from the fuel nozzle to the trailing edge of the flame stabilizer in an afterburner is generally greater than 150mm, the integrated design of the fuel nozzle and the support plate leads to a shortened fuel mixing length, poor atomization, and concentrated fuel distribution, resulting in flame stability issues for the afterburner system throughout the flight envelope. Cavity design, a flame stabilization method widely used in scramjet and subsonic vortex combustors, plays a crucial role in improving combustion efficiency and flame stability. The low-pressure recirculation zone formed inside the cavity prolongs the evaporation time of kerosene droplets, and the higher temperature in the recirculation zone provides a continuous ignition source, ensuring stable combustion.

[0004] Hydrogen-cooled aero-engines are designed for high-altitude, wide-speed, and long-range applications. Due to the inlet ramjet at high speeds, the total inlet temperature of the turbine engine rises significantly, resulting in a substantial decrease in compressor flow capacity and pressure ratio; the higher the designed pressure ratio, the more severe the decline. Simultaneously, the higher compressor outlet temperature at high speeds leads to a significant reduction in combustion chamber heating, resulting in a marked deterioration in engine performance. One solution to this problem is to pre-cool the compressor inlet air using hydrogen as the cooling medium. This maximizes air cooling efficiency, and the resulting gaseous hydrogen can then be combusted with kerosene in the afterburner, achieving highly efficient utilization of the cooling system.

[0005] The working process of the hydrogen-cooled aero-engine is as follows: after the afterburner is started, as the throttle is increased, it goes from a small afterburner state with only the duty stage open to a large afterburner state with both the duty stage and the main working stage fully open. As the thrust further increases, the main stage hydrogen replaces the main stage kerosene, forming a kerosene and hydrogen dual-fuel afterburner with the duty stage kerosene.

[0006] 2. Summary of the shortcomings or deficiencies of existing technologies: 1. In the afterburner of a gas turbine engine, the concave cavity support plate is currently only designed for kerosene injection combustion, and there is no solution for hydrogen injection combustion; 2. The flame propagation speed of hydrogen is relatively fast. If the injection position, injection speed, and injection orifice are not set properly, backfire or even stabilizer erosion may occur; 3. The flame propagation speed of kerosene is relatively slow, and it needs to go through atomization and evaporation processes. Ignition is difficult and it is easy to extinguish under high-speed, low-oxygen inflow conditions; 4. The density of hydrogen is lower than that of high-temperature gas inflow, while the density of kerosene is higher than that of high-temperature gas inflow. The physical properties of the two fuels are quite different, which will seriously affect the synergistic mixing of the two fuels and the high-temperature gas inflow. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a flame stabilizer with a hydrogen-kerosene dual-fuel concave cavity support plate for an afterburner combustion chamber.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A hydrogen-kerosene dual-fuel concave cavity support plate flame stabilizer for an afterburner includes multiple support plates evenly arranged within an outer casing. Each support plate has a concave cavity on the side away from the incoming gas flow. The through end of the concave cavity is closed by a hydrogen injection component. A flow divider plate extending into the concave cavity is provided on the side of the hydrogen injection component corresponding to the concave cavity. A gap exists between the flow divider plate and the cavity wall, dividing the concave cavity into an air intake channel near the incoming gas flow and two exhaust channels near the hydrogen injection component and communicating with the air intake channel. Each support plate has an air intake inlet on the side facing the incoming gas flow that communicates with the air intake channel, and exhaust channels are provided on the surfaces of adjacent support plates. The exhaust outlet of the channel has a main combustion stage kerosene injection pipe and a duty kerosene injection pipe that extend into the exhaust channel at intervals along the direction of the gas flow on the top of the support plate. The duty kerosene injection pipe has duty kerosene nozzles at intervals on both sides of the corresponding concave cavity wall. The main combustion stage kerosene injection pipe has main combustion stage kerosene nozzles extending out of the exhaust channel at intervals on both sides of the corresponding concave cavity wall. The side of the support plate has a low-speed recirculation zone, and the main combustion stage kerosene nozzles are located in the low-speed recirculation zone. The interior of the hydrogen injection component has a hydrogen gathering cavity. The top of the gathering cavity is equipped with a hydrogen injection pipe. The gathering cavity has hydrogen nozzles extending out of the gathering cavity at intervals on the surface of the adjacent hydrogen injection component.

[0009] Preferably, the air intake channel and the two exhaust channels are in a "Y" shape, and the diameter of the air intake channel and the diameter of the exhaust outlet are both larger than the diameter of the exhaust channels.

[0010] Preferably, the outer casing includes a central cone and an outer cylinder fitted on the central cone. There is a gap between the outer cylinder and the central cone to form an annular assembly space. Multiple support plates are evenly arranged in the assembly space, and their two ends are fixedly connected to the central cone and the outer cylinder, respectively. The outer cylinder is provided with clearance holes for the main combustion stage kerosene injection pipe, the duty kerosene injection pipe and the hydrogen injection pipe to pass through one by one.

[0011] Preferably, the side of the support plate has an obtuse angle surface along the direction of the gas flow. The obtuse angle surface includes a base surface parallel to the gas flow and an inclined surface connecting the base surface. A low-speed recirculation zone is formed at the connection between the inclined surface and the base surface.

[0012] Preferably, the thickness of the hydrogen injection component decreases along the direction of the gas flow, and the maximum thickness of the hydrogen injection component is less than the maximum thickness of the support plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the combustion of hydrogen and kerosene dual fuels in the afterburner, which on the one hand improves the working efficiency of the compressor and promotes combustion; on the other hand, using kerosene as the duty stage of the afterburner and hydrogen as the working stage facilitates hydrogen ignition and enables the afterburner to start stably.

[0014] 2. The integrated support plate couples the fuel nozzle, support plate, and stabilizer, resulting in a simple and lightweight structure that significantly improves the engine's thrust-to-weight ratio and facilitates maintenance. The concave cavity on the side of the support plate greatly enhances the flame stability and combustion efficiency of the afterburner. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the arrangement structure of the present invention in the outer casing; Figure 2 is a schematic diagram of the overall structure of the present invention; Figure 3 is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 is a schematic diagram of the present invention assembled on the rectangular support plate; Figure 5 is a thermal numerical simulation result of the present invention under pure hydrogen conditions; Figure 6 is a thermal numerical simulation result of the present invention under kerosene-hydrogen dual fuel conditions.

[0016] Attached diagram labels: 1. Support plate; 101. Air inlet; 102. Low-speed recirculation zone; 103. Exhaust outlet; 104. Low-pressure recirculation zone; 2. Hydrogen injection component; 201. Flow divider; 202. Converging chamber; 203. Hydrogen injection pipe; 204. Hydrogen nozzle; 3. Air inlet channel; 4. Exhaust channel; 5. Main combustion stage kerosene injection pipe; 501. Main combustion stage kerosene nozzle; 6. Serving kerosene injection pipe; 601. Serving kerosene nozzle; 7. Central cone; 8. Outer cylinder; 9. Rectangular support plate. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0018] An embodiment of a hydrogen-kerosene dual-fuel afterburner flame stabilizer with a recessed support plate, as shown in Figures 1-3, includes multiple support plates 1 evenly arranged within the outer casing. Each support plate 1 has a recessed cavity on the side away from the gas flow. The through end of the cavity is closed by a hydrogen injection component 2. A diverter plate 201 extending into the cavity is provided on the side of the hydrogen injection component 2 corresponding to the cavity. A gap exists between the diverter plate 201 and the cavity wall, dividing the cavity into a flow channel 3 near the gas flow and a flow channel 3 near the hydrogen injection component. The support plate 1 has two exhaust channels 4 that are connected to the gas flow channel 3 and are inserted into the gas flow channel 2. The support plate 1 has a gas inlet 101 connected to the gas flow channel 3 on the side facing the gas flow. The support plate 1 has an exhaust outlet 103 connected to the exhaust channel 4 on the side of the adjacent support plate 1. The top of the support plate 1 is provided with a main combustion stage kerosene injection pipe 5 and a duty kerosene injection pipe 6 that extend into the gas flow channel 3 at intervals along the direction of the gas flow. The duty kerosene injection pipe 6 has a duty kerosene spray nozzle on both sides of the corresponding concave cavity wall at intervals. Nozzle 601 enables lateral injection of kerosene. The main combustion-grade kerosene injection pipe 5 has main combustion-grade kerosene nozzles 501 spaced apart on both sides of the corresponding concave cavity wall, extending beyond the exhaust channel 4, to achieve lateral injection of combustion-grade kerosene. The support plate 1 has a low-speed recirculation zone 102 on its side. The main combustion-grade kerosene nozzles 501 are located in the low-speed recirculation zone 102. Because the vapor diffusion capacity of combustion-grade kerosene is weak, sufficient space is needed for mixing, and the low-speed recirculation zone 102 provides greater space for mixing of the combustion-grade kerosene. The mixing space allows for better mixing of the combustion-grade kerosene and the high-temperature fuel gas flow. The hydrogen injection component 2 has a hydrogen-gathering chamber 202 inside, with a hydrogen injection pipe 203 at the top. Hydrogen nozzles 204, spaced evenly from adjacent hydrogen injection components 2, extend outwards from the chamber, enabling lateral injection. Due to the strong diffusion capacity of hydrogen, lateral injection effectively increases its diffusion range, promoting mixing with the high-temperature fuel gas flow. It should be noted that "lateral" in "lateral injection" refers to a direction perpendicular to the fuel gas flow.

[0019] In practice, the high-temperature gas generated during the first combustion in the afterburner serves as the combustion gas flow in this embodiment. This combustion gas flow, along with the combustion-grade kerosene, the standby kerosene, and hydrogen, undergoes secondary combustion to achieve afterburner combustion in the combustion chamber. Specifically, a portion of the combustion gas flow (high-temperature gas) enters the concave cavity through the induced draft inlet 101, then passes through the induced draft channel 3 and the exhaust channel 4 before being discharged through the exhaust outlet 103. The other portion passes outside the concave cavity. During this process, the kerosene is injected laterally through the kerosene injection pipe 6 and the kerosene nozzle 601, impacting the inner wall of the concave cavity to form a liquid film on the inner wall of the exhaust channel 4. Under the action of the high-temperature gas flow, it breaks into liquid mist at the exhaust outlet 103, which can be better ignited. Furthermore, due to the low flow velocity inside the concave cavity, a large pressure difference is generated between the airflow inside the concave cavity and the airflow at the exhaust outlet 103, thereby forming a low-pressure reflux zone 104 in the exhaust channel 4. This allows some of the kerosene droplets to be entrained into the low-pressure reflux zone 104, providing more space for the kerosene to atomize, evaporate, and mix with the high-temperature gas flow. This ensures that the kerosene drawn from the exhaust channel 4 can burn continuously and stably, avoiding the kerosene burning under conditions of high-speed, low-oxygen gas flow. The flameout is initiated; the combustion-grade kerosene is injected laterally into the low-speed recirculation zone 102 through the main combustion-grade kerosene injection pipe 5 and the main combustion-grade kerosene nozzle 501. The low-speed recirculation zone 102 provides a larger mixing space for the combustion-grade kerosene, resulting in better mixing between the combustion-grade kerosene and the high-temperature gas flow. When the combustion-grade kerosene flows through the exhaust outlet 103, it is ignited by the combustion-grade kerosene under high-speed, low-oxygen gas flow conditions. Hydrogen is injected into the converging chamber 202 through the hydrogen injection pipe 203 and then injected laterally perpendicular to the main flow through the hydrogen nozzle 204. Due to the strong diffusion capacity of hydrogen, the lateral injection effectively promotes the mixing of hydrogen and the high-temperature gas flow, resulting in a higher hydrogen adiabatic flame temperature and improving the combustion efficiency of kerosene after the support plate.

[0020] In practical applications, hydrogen is burned using diffusion combustion without premixing to avoid backfire. Kerosene uses a partially premixed combustion organization (partial premixing means that a portion of the kerosene is mixed with the incoming flow, while the rest remains unmixed), and the main combustion stage kerosene nozzle 501 is positioned rearward, allowing the kerosene to quickly enter the low-speed recirculation zone 102, providing sufficient physical space to complete atomization, evaporation, and other physicochemical processes. Simultaneously, adjusting the number and diameter of the hydrogen and kerosene nozzles alters the momentum ratio between the fuel and the high-temperature combustion gas, improving the penetration depth of both fuels and facilitating combustion. Under low-oxygen and high-speed conditions, the kerosene flame propagation speed may be lower than the flow rate of the high-temperature combustion gas, making ignition difficult and extinguishing easily. The concave cavity creates a low-pressure zone next to the kerosene flow line, thereby generating a low-speed recirculation zone, promoting kerosene atomization and evaporation, and making the flame more stable.

[0021] As a preferred embodiment of the above, the air intake channel 3 and the two exhaust channels 4 are in a "Y" shape, and the diameter of the air intake channel 3 and the diameter of the exhaust outlet 103 are both larger than the diameter of the exhaust channel 4. This structure with large ends and narrowed middle diameter is similar to the structure of a Venturi tube.

[0022] As a preferred embodiment of the above, the outer casing includes a central cone 7 and an outer cylinder 8 fitted on the central cone 7. There is a gap between the outer cylinder 8 and the central cone 7 to form an annular assembly space. Multiple support plates 1 are evenly arranged in the assembly space, and their two ends are fixedly connected to the central cone 7 and the outer cylinder 8 respectively. The outer cylinder 8 is provided with clearance holes for the main combustion stage kerosene injection pipe 5, the duty kerosene injection pipe 6 and the hydrogen injection pipe 203 to pass through.

[0023] As a preferred embodiment of the above, the side of the support plate 1 has an obtuse angle surface along the direction of the gas flow. The obtuse angle surface includes a base surface that is parallel to the gas flow and an inclined surface that connects to the base surface. The connection between the inclined surface and the base surface forms a low-speed recirculation zone 102.

[0024] As a preferred embodiment of the above, the thickness of the hydrogen injection component 2 decreases along the direction of the gas flow, and the maximum thickness of the hydrogen injection component 2 is less than the maximum thickness of the support plate 1. Application example: The present invention aims to provide an integrated support plate and cavity stabilizer under high-altitude, high-speed, and low-oxygen conditions, with the following specific structure: (1) Hydrogen, as a fuel with high calorific value, high reactivity, and wide flammability limit, has great potential in achieving high combustion efficiency in the combustion chamber. However, hydrogen premixed combustion is prone to increasing the risk of backfire, so diffusion combustion is chosen. At the same time, the existence of the leeward low-speed recirculation zone of the jet is beneficial to the mixing of hydrogen and air, thereby improving the combustion efficiency.

[0025] (2) When kerosene is sprayed into the concave cavity during the shift, the low flow velocity inside the concave cavity will cause a large pressure difference between the concave cavity and the airflow at the outlet of the air intake channel. A low-pressure reflux zone 104 is formed inside the concave cavity. Some kerosene droplets will be drawn into the reflux zone, giving the kerosene more space to atomize, evaporate and mix with the high-temperature gas flow, generating a continuous ignition source to ensure the continuous and stable combustion of kerosene and avoid kerosene extinguishing under high-speed and low-oxygen gas flow conditions.

[0026] (3) Due to the significant differences in the physicochemical properties of hydrogen and kerosene, we inject the two fuels separately to coordinate their combustion. The hydrogen nozzle is positioned relatively forward, providing more space for the hydrogen to mix with the high-temperature combustion gas flow, thus compensating for the disadvantage of hydrogen's rapid diffusion but easy dispersion. The hydrogen is injected through a multi-hole, transverse jet, which prolongs the residence time, increases the penetration depth, promotes mixing with the incoming flow, suppresses flashback, and prevents hydrogen backfire. The kerosene nozzle is positioned further back, allowing kerosene droplets to quickly enter the expansion area behind the stabilizer, facilitating kerosene atomization and evaporation, while preventing it from impacting the stabilizer and causing carbon buildup on the wall.

[0027] (4) Both the main combustion stage and the duty kerosene injector rods are built into the stabilizer and use direct injection nozzles. The stabilizer is equipped with an air intake channel, with the air inlet located at the front edge of the stabilizer and the air outlet located in the concave cavity. The main combustion stage kerosene nozzles are located on the side wall of the stabilizer, and the duty kerosene nozzles are located in the air intake channel. Both kerosene nozzles are side-spraying. The design principle of the rear end of the air intake channel is based on the Venturi tube, using the inverse relationship between the flow velocity and the cross-sectional area of ​​the channel to set it as an expansion channel. The horizontally injected duty kerosene impacts the inner wall of the channel, forming a liquid film on the inner wall of the expansion Venturi tube, and under the action of the high-temperature gas flow, it breaks into liquid mist at the end of the Venturi tube. The Venturi tube reduces the flow velocity of the high-temperature gas flow near the duty kerosene nozzle, increases the mixing time of kerosene vapor and the flow, and effectively promotes the mixing of kerosene. The premixed kerosene-gas mixture is discharged into the concave cavity and combusted in the low-speed recirculation zone, forming a stable ignition zone and improving combustion efficiency. A verification example shows the installation diagram of one of the stabilizers in the afterburner chamber within a rectangular combustion test specimen, as shown in Figure 1. The concave cavity support structure is shown in Figure 2, and the cross-section of the airflow channel is shown in Figure 3. The height of the test section is... The stabilizer is designed with a straight line perpendicular to the flow path in the radial direction. The overall height of the support plate is... , length is (110mm~150mm), the maximum groove width of the cavity is (20mm~35mm), the distance between the cavity and the leading edge is (50mm~80mm), cavity depth is (5mm~15mm), length-to-height ratio between 1.5 and 1.8, rear lean angle is (110°~175°). The height of the stabilizer's inner cavity is... (40mm~120mm), the main combustion-grade kerosene injection holes are downstream of the stabilizer leading edge. At a distance of 15mm~35mm, the duty nozzle is downstream of the leading edge. At a distance of 35mm~50mm, the length of the rear structure of the cavity is 15mm~30mm. Both hydrogen and kerosene nozzles are located on the side of the stabilizer, with the hydrogen nozzles evenly distributed longitudinally and the kerosene nozzles evenly distributed longitudinally on the inner wall of the stabilizer. The diameter of the hydrogen nozzle is... (1.5mm~3.5mm), number of nozzles on one side is (4~12); Kerosene nozzle diameter is (0.5mm~1.0mm), the number of nozzles on one side of the main combustion stage is (2~10), the number of nozzles on one side for each shift is (1~3).

[0028] The innovative use of hydrogen and kerosene dual fuels in the afterburner improves compressor efficiency and promotes combustion. Furthermore, using kerosene as the standby fuel in the afterburner and hydrogen as the working stage facilitates hydrogen ignition and ensures stable start-up. An integrated support plate couples the fuel nozzle, support plate, and stabilizer, resulting in a simple and lightweight structure that significantly improves the engine's thrust-to-weight ratio and facilitates maintenance. A concave cavity on the side of the support plate greatly enhances flame stability and combustion efficiency in the afterburner. An airflow channel is incorporated within the stabilizer, and the rear end is designed as a venturi structure.

[0029] Fluent numerical simulations were performed on the test specimens. Figure 5 shows the hot-state numerical simulation results under pure hydrogen conditions, indicating successful hydrogen ignition and excellent flame fusion. Figure 6 shows the numerical simulation results under dual-fuel conditions, demonstrating good combustion performance.

[0030] Fluent numerical simulations were performed on the test specimens. Figure 5 shows the hot-state numerical simulation results under pure hydrogen conditions, indicating successful hydrogen ignition and excellent flame fusion. Figure 6 shows the numerical simulation results under dual-fuel conditions, demonstrating good combustion performance.

[0031] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A flame stabilizer with a hydrogen-kerosene dual-fuel concave cavity support plate for an afterburner, characterized in that, The device includes multiple support plates (1) evenly arranged within the outer casing. Each support plate (1) has a cavity on the side away from the incoming gas flow. The through end of the cavity is closed by a hydrogen injection component (2). The hydrogen injection component (2) has a diverter plate (201) extending into the cavity on the side corresponding to the cavity. The diverter plate (201) has a gap with the cavity wall and divides the cavity into an air intake channel (3) near the incoming gas flow and two exhaust channels (4) near the hydrogen injection component (2) and communicating with the air intake channel (3). Each support plate (1) has an air intake inlet (101) communicating with the air intake channel (3) on the side facing the incoming gas flow. Each adjacent support plate (1) has an exhaust outlet (103) communicating with the exhaust channels (4). The top of each support plate (1) has extensions extending into the exhaust channels (4) spaced apart along the direction of the incoming gas flow. The main combustion stage kerosene injection pipe (5) and the duty kerosene injection pipe (6) are located in the airflow channel (3). The duty kerosene injection pipe (6) is provided with duty kerosene nozzles (601) at intervals on both sides of the cavity wall. The main combustion stage kerosene injection pipe (5) is provided with main combustion stage kerosene nozzles (501) extending out of the exhaust channel (4) at intervals on both sides of the cavity wall. The side of the support plate (1) has a low-speed reflux zone (102). The main combustion stage kerosene nozzles (501) are located in the low-speed reflux zone (102). The hydrogen injection component (2) has a hydrogen gathering cavity (202) inside. The top of the gathering cavity (202) is provided with a hydrogen injection pipe (203). The gathering cavity (202) is provided with hydrogen nozzles (204) extending out of the gathering cavity (202) at intervals on the surface of the adjacent hydrogen injection component (2).

2. The afterburner hydrogen-kerosene dual-fuel concave cavity support flame stabilizer according to claim 1, characterized in that, The air intake channel (3) and the two exhaust channels (4) are in a "Y" shape, and the diameter of the air intake channel (3) and the diameter of the exhaust outlet (103) are both larger than the diameter of the exhaust channel (4).

3. The afterburner hydrogen-kerosene dual-fuel concave cavity support flame stabilizer according to claim 2, characterized in that, The outer casing includes a central cone (7) and an outer cylinder (8) fitted on the central cone (7). There is a gap between the outer cylinder (8) and the central cone (7) to form an annular assembly space. Multiple support plates (1) are evenly arranged in the assembly space, and their two ends are fixedly connected to the central cone (7) and the outer cylinder (8) respectively. The outer cylinder (8) is provided with clearance holes for the main combustion stage kerosene injection pipe (5), the duty kerosene injection pipe (6) and the hydrogen injection pipe (203) to pass through one by one.

4. The afterburner hydrogen-kerosene dual-fuel concave cavity support flame stabilizer according to claim 3, characterized in that, The side of the support plate (1) has an obtuse angle surface along the direction of the gas flow. The obtuse angle surface includes a base surface that is parallel to the gas flow and an inclined surface that connects to the base surface. The connection between the inclined surface and the base surface forms the low-speed recirculation zone (102).

5. The afterburner hydrogen-kerosene dual-fuel concave cavity support flame stabilizer according to claim 4, characterized in that, The thickness of the hydrogen injection component (2) decreases along the direction of the gas flow, and the maximum thickness of the hydrogen injection component (2) is less than the maximum thickness of the support plate (1).

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