Gas atomization jet cavity integration module for catalytic decomposition of hydrogen peroxide and jet flame stabilization enhancement method

Abstract

The invention relates to the technical field of scramjet engines, solves the technical problems that a scramjet engine wide-area structure is high in combustion difficulty and flame stabilization difficulty, and particularly relates to a hydrogen peroxide catalytic decomposition gas atomization injection concave cavity integration module and an injection flame stabilization enhancement method. Liquid hydrogen peroxide is decomposed into high-temperature oxygen and water vapor by adopting a catalytic decomposition module, then the high-temperature oxygen and the water vapor are mixed with kerosene in a decomposition gas pipeline to form kerosene which is aerated and atomized by the high-temperature oxygen and the water vapor, the kerosene is transversely sprayed at the upstream of a concave cavity through a gas atomization kerosene spraying hole, and gas atomization kerosene transverse jet flow is formed in a supersonic combustion chamber; therefore, the combustion efficiency is improved. The oxygen-enriched jet flow for enhancing the combustion performance is formed in the supersonic combustion chamber, the ignition performance of liquid kerosene can be improved, meanwhile, the atomization particle size can be reduced, the jet flow penetration depth can be increased, the fuel gas mixing efficiency can be improved, and the supersonic combustion flame stabilizing range of the liquid kerosene can be widened.

Description

Technical Field

[0001] The invention relates to the technical field of scramjet engines, and in particular to an aerosolized injection cavity integrated module for catalytic decomposition of hydrogen peroxide and an injection flame stabilization enhancement method. Background Art

[0002] Liquid hydrocarbon fuel in the supersonic combustion chamber mainly undergoes the processes of fuel injection atomization, fuel-air mixing, ignition and stable combustion. The whole process is usually completed within a few milliseconds of fuel residence time, so it is required that the fuel must be quickly mixed with the incoming air after injection, and corresponding flame stabilization measures must be adopted to ensure that the fuel is fully burned and releases heat within a short residence time, and finally converted into thrust.

[0003] However, for scramjet engines in flight conditions of Ma<4.0, the fuel cannot ignite itself due to the low total temperature of the incoming flow (<900K). At the same time, it is restricted by the physical processes of liquid hydrocarbon fuel droplet breakup, atomization, evaporation, and gas mixing, which leads to a long ignition delay time and difficulty in ignition and flame stabilization in the combustion chamber. For flight conditions of Ma>7, the ultra-high-speed flow reduces the mixing efficiency of fuel and air, shortens the fuel residence time, and increases the difficulty of combustion organization. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an integrated module of a gas atomization injection cavity for catalytic decomposition of hydrogen peroxide and a method for enhancing injection flame stabilization, which solves the technical problems of difficulty in wide-area organized combustion and difficulty in flame stabilization in scramjet engines.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: an integrated module for atomizing and injecting a cavity for catalytic decomposition of hydrogen peroxide, comprising a supply module for supplying liquid hydrogen peroxide to a catalytic decomposition module by extrusion supply or pump pressure supply, wherein the catalytic decomposition module fully and completely catalytically decomposes the liquid hydrogen peroxide into a high-temperature decomposition gas of hydrogen peroxide containing high-temperature oxygen and water vapor;

[0006] The gas atomization injection cavity integrated module also includes an injection cavity integrated module arranged on the supersonic combustion chamber, and a gas atomization kerosene spray hole with an outlet placed on the surface of the injection cavity integrated module. A cavity is arranged downstream of the gas atomization kerosene spray hole. The high-temperature decomposition gas of hydrogen peroxide and kerosene are mixed in the injection cavity integrated module to form aerated atomized kerosene aerated and atomized by high-temperature oxygen and water vapor, which is laterally sprayed upstream of the cavity through the gas atomization kerosene spray hole, and an oxygen-rich jet that enhances combustion performance is formed in the supersonic combustion chamber, and the oxygen-rich jet burns in the cavity to form a high-temperature, oxygen-rich, low-speed reflux zone.

[0007] Furthermore, the cavity includes a front end face of the cavity perpendicular to the surface of the injection cavity integrated module, and a bottom face of the cavity parallel to the surface of the injection cavity integrated module and perpendicular to the front end face of the cavity, and the inclined surface connecting the bottom face of the cavity and the surface of the injection cavity integrated module constitutes a rear end face of the cavity.

[0008] Furthermore, the outlet of the catalytic decomposition module is connected to a sonic flowmeter, and the high-temperature decomposition gas of hydrogen peroxide generates a critical cross section at the throat of the sonic flowmeter, thereby achieving throttling of the high-temperature decomposition gas of hydrogen peroxide.

[0009] Furthermore, the injection cavity integrated module includes a kerosene inlet pipeline arranged thereon, and a decomposition gas pipeline connected to the outlet of the sonic flowmeter, the hydrogen peroxide decomposition gas pipeline is coaxial with and penetrates the atomized kerosene nozzle, a plurality of liquid inlet holes are arranged on the decomposition gas pipeline, and the decomposition gas pipeline is connected to the kerosene pipeline through the liquid inlet holes;

[0010] The kerosene inlet pipeline is connected to the kerosene pipeline after passing through the annular kerosene confluence chamber. Multiple kerosene pipelines are parallel to the decomposition gas pipeline and are evenly distributed around the circumference thereof. The injection cavity integrated module is provided with an igniter vertically mounted on the bottom surface of the cavity, and the working surface of the igniter is coplanar with the bottom surface of the cavity.

[0011] Furthermore, the liquid inlet hole is any one of a straight hole, an inclined hole or a tangential hole, the number of the liquid inlet holes is at least 4, and the cross-sectional shape of the liquid inlet hole is at least one of a circular, elliptical, rectangular, diamond or raindrop shape.

[0012] Furthermore, the number of the aerosolized kerosene spray holes can be one or more, the cross-sectional shape of the aerosolized kerosene spray holes is one of circular, elliptical, rectangular, diamond or raindrop-shaped, and the axis of the aerosolized kerosene spray holes is at right angles to the surface of the injection cavity integrated module.

[0013] Furthermore, the length-to-depth ratio of the cavity is 5-8, the angle between the rear end face of the cavity and the bottom face of the cavity is 40°-50°, and the distance from the front end face of the cavity to the atomizing kerosene nozzle is 15-30 times the equivalent diameter of the nozzle.

[0014] Further, the catalytic decomposition module has an outer shell, including a hydrogen peroxide inlet, a compression element, a distribution orifice plate, a catalytic bed, an outlet porous structure and a hydrogen peroxide decomposition gas outlet which are sequentially distributed in the outer shell from upstream to downstream;

[0015] The hydrogen peroxide inlet is connected to the outlet of the supply module through a pipeline, and the distribution orifice plate, the catalyst bed, and the outlet porous structure are sequentially pressed and fixed in the outer shell from top to bottom by a pressing element, wherein the pressing element is a gasket or a spring, and the distribution orifice plate is evenly provided with a plurality of small holes for evenly entering the catalyst bed.

[0016] Furthermore, the catalytic bed is a porous structure of 40-70 pieces of 40-mesh silver mesh overlapping structure or a silver-plated nickel-based high-temperature alloy 3D printing, and the porous structure is a lattice structure with a porosity of 30% to 80%;

[0017] The outlet porous structure is a porous structure 3D-printed by a nickel-based high-temperature alloy, and the porous structure is a lattice structure or a straight hole structure.

[0018] The technical solution also provides a method for enhancing the flame stabilization of injection using the above-mentioned gas atomization injection cavity integrated module, the method comprising the following steps:

[0019] S1. The supply module delivers liquid hydrogen peroxide to the hydrogen peroxide inlet of the catalytic decomposition module through the first pipeline, and then the hydrogen peroxide flows through the distribution orifice plate in sequence and evenly passes through the catalytic bed. The outlet porous structure provides a certain back pressure for the hydrogen peroxide flowing through the catalytic bed, so that the hydrogen peroxide is fully in contact with the silver mesh or the silver-plated porous structure in the catalytic bed, ensuring that the hydrogen peroxide is fully and completely catalytically decomposed into hydrogen peroxide high-temperature decomposition gas, that is, high-temperature oxygen and water vapor;

[0020] S2, high-temperature oxygen and water vapor flow out from the hydrogen peroxide decomposition gas outlet of the catalytic decomposition module, and generate a critical cross section at the throat of the sonic flowmeter to achieve throttling of the high-temperature decomposition gas of hydrogen peroxide;

[0021] S3, the high-temperature decomposition gas of hydrogen peroxide flowing out of the sonic flowmeter enters the decomposition gas pipeline through the second pipeline, and at the same time, kerosene flows through the kerosene confluence chamber and the kerosene pipeline through the kerosene inlet pipeline, enters the decomposition gas pipeline through the liquid inlet hole, and mixes with high-temperature oxygen and water vapor in the decomposition gas pipeline to form aerated atomized kerosene aerated and atomized by high-temperature oxygen and water vapor;

[0022] S4, the kerosene atomized by high-temperature oxygen and water vapor is sprayed laterally upstream of the cavity through the atomized kerosene nozzle hole, and forms an atomized kerosene lateral jet in the supersonic combustion chamber;

[0023] S5. The difference in air flow velocity between the mainstream and the concave cavity in the supersonic combustion chamber forms a concave cavity shear layer at the front end surface of the concave cavity. A portion of the oxygen-rich atomized kerosene lateral jet oscillates through the concave cavity shear layer and enters the concave cavity, where it burns to form a high-temperature, oxygen-rich, low-speed recirculation zone, thereby widening the flame stabilization range.

[0024] By means of the above technical solution, the present invention provides an integrated module of atomized injection cavity for catalytic decomposition of hydrogen peroxide and a method for enhancing injection flame stabilization, which has at least the following beneficial effects:

[0025] 1. The gas atomization injection cavity integrated module proposed in the present invention can help improve the ignition performance of liquid kerosene by forming an oxygen-rich jet with enhanced combustion performance in the supersonic combustion chamber. At the same time, it can reduce the atomized particle size and increase the jet penetration depth, thereby improving the gas mixing efficiency. In addition, a portion of the gas atomized kerosene enters the cavity through shear layer oscillation, forming a high-temperature, oxygen-rich, low-speed confluence zone in the cavity, which helps to broaden the flame stabilization range of the supersonic combustion of liquid kerosene.

[0026] 2. The present invention utilizes the fact that the pressure inside the atomized kerosene nozzle is higher than the ambient pressure inside the supersonic combustion chamber, and the bubbles in the atomized kerosene transverse jet further expand and rupture, so that the kerosene wrapped outside the bubbles breaks up and forms droplets with smaller particle sizes. In addition, the jet penetration depth can be increased during transverse injection, the gas mixing distance can be shortened, and the gas mixing efficiency can be improved. In addition, the high-temperature decomposition gas of hydrogen peroxide contains high-temperature oxygen, and the oxygen-rich jet formed during transverse injection can shorten the ignition time and enhance the combustion performance.

[0027] 3. The present invention utilizes the difference in air flow velocity between the mainstream of the supersonic combustion chamber and the concave cavity to form a concave cavity shear layer at the front end surface of the concave cavity, which causes the atomized kerosene transverse jet to oscillate into the concave cavity, thereby widening the flame stabilization range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 It is a schematic diagram of the structure of the aerosol injection cavity integrated module in the present invention;

[0030] Figure 2 Schematic diagram of the flow field of the atomized kerosene lateral jet in the present invention.

[0031] In the figure: 1. supply module; 2. catalytic decomposition module; 3. sonic flowmeter; 4. injection cavity integrated module; 5. first pipeline; 6. second pipeline; 7. decomposition gas pipeline; 8. hydrogen peroxide inlet; 9. pressing element; 10. distribution orifice plate; 11. catalytic bed; 12. outlet porous structure; 13. hydrogen peroxide decomposition gas outlet; 14. kerosene inlet pipeline; 15. kerosene confluence cavity; 16. kerosene pipeline; 17. liquid inlet hole; 18. atomized kerosene spray hole; 19. cavity; 20. igniter; 21. front end face of cavity; 22. bottom face of cavity; 23. rear end face of cavity; 24. aerated atomized kerosene; 25. atomized kerosene lateral jet; 26. main flow of supersonic combustion chamber; 27. cavity shear layer; 28. low-speed recirculation zone. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Embodiment 1

[0034] In order to solve the problem of wide-area combustion organization and flame stabilization in scramjet engines, please refer to Figure 1 and Figure 2 This embodiment proposes an integrated module of atomized injection cavity for catalytic decomposition of hydrogen peroxide. By forming an oxygen-rich jet to enhance combustion performance in a supersonic combustion chamber, it can help improve the ignition performance of liquid kerosene, reduce the atomized particle size and increase the jet penetration depth, improve the gas mixing efficiency, and a part of the atomized kerosene enters the cavity through shear layer oscillation, forming a high-temperature oxygen-rich low-speed confluence area in the cavity, which helps to broaden the range of liquid kerosene supersonic combustion flame stabilization. Among them, the supply module 1 supplies liquid hydrogen peroxide to the catalytic decomposition module 2 in an extrusion supply or pump pressure supply mode, and the sonic flowmeter 3 is connected to the outlet of the catalytic decomposition module 2. The catalytic decomposition module 2 fully and completely catalytically decomposes the liquid hydrogen peroxide into a hydrogen peroxide high-temperature decomposition gas containing high-temperature oxygen and water vapor, and the hydrogen peroxide high-temperature decomposition gas generates a critical section at the throat of the sonic flowmeter 3 to achieve throttling of the hydrogen peroxide high-temperature decomposition gas.

[0035] The gas atomization injection cavity integrated module also includes an injection cavity integrated module 4 arranged on the supersonic combustion chamber, and a gas atomization kerosene spray hole 18 whose outlet is placed on the surface of the injection cavity integrated module 4. The injection cavity integrated module 4 is processed by mechanical processing, welding or additive manufacturing integrated forming. A cavity 19 is arranged downstream of the gas atomization kerosene spray hole 18. The number of the gas atomization kerosene spray holes 18 can be one or more. The cross-sectional shape of the gas atomization kerosene spray hole 18 is one of a circular, elliptical, rectangular, diamond or raindrop shape, and the axis of the gas atomization kerosene spray hole 18 is at right angles to the surface of the injection cavity integrated module 4. The high-temperature decomposition gas of hydrogen peroxide is mixed with kerosene in the injection cavity integrated module 4 to form aerated atomized kerosene 24 aerated and atomized by high-temperature oxygen and water vapor, which is laterally injected upstream of the cavity 19 through the atomized kerosene nozzle 18, and forms an oxygen-rich jet that enhances the combustion performance in the supersonic combustion chamber, and the oxygen-rich jet burns in the cavity 19 to form a high-temperature, oxygen-rich, low-speed reflow zone 28.

[0036] The cavity 19 includes a cavity front end face 21 perpendicular to the surface of the injection cavity integrated module 4, and a cavity bottom face 22 parallel to the surface of the injection cavity integrated module 4 and perpendicular to the cavity front end face 21. The inclined surface connecting the cavity bottom face 22 and the surface of the injection cavity integrated module 4 constitutes a cavity rear end face 23. The length-to-depth ratio of the cavity 19 is 5 to 8, the angle between the cavity rear end face 23 and the cavity bottom face 22 is 40° to 50°, and the distance from the cavity front end face 21 to the atomizing kerosene nozzle 18 is 15 to 30 times the equivalent diameter of the nozzle.

[0037] The injection cavity integrated module 4 includes a kerosene inlet pipeline 14 arranged thereon, and a decomposition gas pipeline 7 connected to the outlet of the sonic flowmeter 3 through a second pipeline 6. The hydrogen peroxide decomposition gas pipeline 7 is coaxial with and penetrates the atomized kerosene nozzle 18. A plurality of liquid inlet holes 17 are provided on the decomposition gas pipeline 7. The liquid inlet holes 17 are any one of straight holes, inclined holes or tangential holes. The number of the liquid inlet holes 17 is at least 4, and the cross-sectional shape of the liquid inlet holes 17 is at least one of circular, elliptical, rectangular, diamond or raindrop-shaped. The decomposition gas pipeline 7 is connected to the kerosene pipeline 16 through the liquid inlet hole 17, and the kerosene inlet pipeline 14 is connected to the kerosene pipeline 16 after passing through the annular kerosene confluence chamber 15. The kerosene pipeline 16 is a plurality of pipelines parallel to the decomposition gas pipeline 7 and evenly distributed around the decomposition gas pipeline 7. The injection cavity integrated module 4 is provided with an igniter 20 vertically mounted on the bottom surface 22 of the cavity, and the working surface of the igniter 20 is coplanar with the bottom surface 22 of the cavity.

[0038] The catalytic decomposition module 2 has an outer shell, including a hydrogen peroxide inlet 8, a pressing element 9, a distribution orifice plate 10, a catalytic bed 11, an outlet porous structure 12 and a hydrogen peroxide decomposition gas outlet 13 which are sequentially distributed in the outer shell from upstream to downstream. The hydrogen peroxide inlet 8 is connected to the outlet of the supply module 1 through a first pipeline 5. The distribution orifice plate 10, the catalytic bed 11 and the outlet porous structure 12 are sequentially pressed and fixed in the outer shell from top to bottom by the pressing element 9. The pressing element 9 is a gasket or a spring. The distribution orifice plate 10 is evenly distributed with a plurality of small holes for allowing hydrogen peroxide to evenly enter the catalytic bed 11.

[0039] The catalytic bed 11 is a porous structure of 40-70 pieces of 40-mesh silver mesh overlapping structure or a silver-plated nickel-based high-temperature alloy 3D printing, and the porous structure is a lattice structure with a porosity of 30% to 80%, ensuring sufficient surface area to promote the full decomposition of hydrogen peroxide while keeping the pressure drop within an acceptable range. The silver plating thickness of the porous structure is greater than 10μm.

[0040] The outlet porous structure 12 is a nickel-based high-temperature alloy 3D-printed porous structure, which is a lattice structure or a straight pore structure. When hydrogen peroxide flows through the outlet porous structure, a certain back pressure is provided for the catalyst bed 11, thereby increasing the retention time of hydrogen peroxide in the catalyst bed 11.

[0041] This embodiment utilizes the high-temperature decomposition gas of hydrogen peroxide generated by the catalytic decomposition of hydrogen peroxide, and after mixing with kerosene through the atomizing kerosene nozzle, atomizes the liquid kerosene and sprays it laterally, thereby reducing the atomized particle size and increasing the jet penetration depth, thereby improving the gas mixing efficiency.

[0042] After the hydrogen peroxide high temperature decomposition gas atomizes the liquid kerosene, an oxygen-rich jet is formed, which helps to improve the ignition performance of the liquid kerosene. At the same time, a part of the atomized kerosene enters the cavity through shear layer oscillation, forming a high-temperature oxygen-rich low-speed confluence area in the cavity, which helps to broaden the range of liquid kerosene supersonic combustion flame stabilization.

[0043] Embodiment 2

[0044] Based on Example 1, please refer to Figure 1 and Figure 2 This embodiment proposes a method for enhancing flame stabilization by injection using an integrated module of a gas-atomized injection cavity. The method is based on the catalytic decomposition module 2 to decompose liquid hydrogen peroxide into high-temperature oxygen and water vapor, and then mix it with kerosene in the decomposition gas pipeline 7 to form kerosene 24 aerated and atomized by high-temperature oxygen and water vapor, and then spray it laterally upstream of the cavity 19 through the gas-atomized kerosene nozzle 18, and form a gas-atomized kerosene transverse jet 25 in the supersonic combustion chamber, thereby improving the combustion efficiency. Finally, a part of the oxygen-enriched gas-atomized kerosene transverse jet 25 oscillates through the cavity shear layer 27 and enters the cavity 19, and burns in the cavity 19 to form a high-temperature, oxygen-enriched, low-speed recirculation zone 28, thereby widening the flame stabilization range. The specific implementation method is as follows:

[0045] S1. The supply module 1 transports liquid hydrogen peroxide to the hydrogen peroxide inlet 8 of the catalytic decomposition module 2 through the first pipeline 5. Then, the hydrogen peroxide flows through the distribution orifice plate 10 in sequence and then evenly passes through the catalyst bed 11. The outlet porous structure 12 provides a certain back pressure for the hydrogen peroxide flowing through the catalyst bed 11, so that the hydrogen peroxide is fully in contact with the silver mesh or the silver-plated porous structure in the catalyst bed 11, ensuring that the hydrogen peroxide is fully and completely catalytically decomposed into hydrogen peroxide high-temperature decomposition gas, that is, high-temperature oxygen and water vapor.

[0046] S2, high-temperature oxygen and water vapor flow out from the hydrogen peroxide decomposition gas outlet 13 of the catalytic decomposition module 2, and a critical cross section is generated at the throat of the sonic flowmeter 3 to achieve throttling of the high-temperature decomposition gas of hydrogen peroxide, wherein the total temperature T0, total pressure P0 and throat area A of the hydrogen peroxide decomposition gas outlet 13 are * Determining the flow rate of hydrogen peroxide pyrolysis gas Right now:

[0047]

[0048] Wherein, R is the gas constant of hydrogen peroxide high temperature decomposition; γ is the specific heat ratio of hydrogen peroxide high temperature decomposition gas.

[0049] S3. The high-temperature decomposition gas of hydrogen peroxide flowing out of the sonic flowmeter 3 enters the decomposition gas pipeline 7 through the second pipeline 6. At the same time, kerosene flows through the kerosene confluence chamber 15 and the kerosene pipeline 16 through the kerosene inlet pipeline 14, enters the decomposition gas pipeline 7 through the liquid inlet hole 17, and mixes with the high-temperature oxygen and water vapor in the decomposition gas pipeline 7 to form aerated atomized kerosene 24 aerated and atomized by the high-temperature oxygen and water vapor.

[0050] S4, the kerosene 24 aerated and atomized by high-temperature oxygen and water vapor is sprayed laterally upstream of the concave cavity 19 through the atomized kerosene spray hole 18, and forms an atomized kerosene transverse jet 25 in the supersonic combustion chamber. Because the pressure in the atomized kerosene spray hole 18 is higher than the ambient pressure in the supersonic combustion chamber, the bubbles in the atomized kerosene transverse jet 25 further expand and rupture, causing the kerosene wrapped outside the bubbles to break and form droplets with smaller particle sizes. The transverse injection of the atomized kerosene transverse jet 25 can increase the jet penetration depth, shorten the gas mixing distance, and improve the gas mixing efficiency. In addition, the hydrogen peroxide high-temperature decomposition gas contains high-temperature oxygen, and the oxygen-rich jet formed during the transverse injection can shorten the ignition time and enhance the combustion performance.

[0051] S5. The difference in air flow velocity between the mainstream 26 of the supersonic combustion chamber and the concave cavity 19 forms a concave cavity shear layer 27 at the front end surface 21 of the concave cavity. A portion of the oxygen-rich atomized kerosene transverse jet 25 oscillates through the concave cavity shear layer 27 and enters the concave cavity 19, where it burns to form a high-temperature, oxygen-rich, low-speed recirculation zone 28, thereby widening the flame stabilization range.

[0052] This embodiment can help improve the ignition performance of liquid kerosene by forming an oxygen-rich jet that enhances combustion performance in the supersonic combustion chamber, while reducing the atomized particle size and increasing the jet penetration depth, thereby improving the gas mixing efficiency. In addition, a portion of the atomized kerosene enters the concave cavity through shear layer oscillation, forming a high-temperature, oxygen-rich, low-speed confluence zone in the concave cavity, which helps to broaden the flame stabilization range of the supersonic combustion of liquid kerosene.

[0053] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the above embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0054] The above implementation methods have been described in detail. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An integrated module for atomizing and injecting a cavity for catalytic decomposition of hydrogen peroxide, comprising a supply module (1) for supplying liquid hydrogen peroxide to a catalytic decomposition module (2) by extrusion supply or pump pressure supply, characterized in that: The catalytic decomposition module (2) catalytically decomposes liquid hydrogen peroxide into a hydrogen peroxide high-temperature decomposition gas containing high-temperature oxygen and water vapor; The gas atomization injection cavity integrated module also includes an injection cavity integrated module (4) arranged on the supersonic combustion chamber, and a gas atomization kerosene spray hole (18) with an outlet disposed on the surface of the injection cavity integrated module (4); a cavity (19) is arranged downstream of the gas atomization kerosene spray hole (18); hydrogen peroxide high temperature decomposition gas and kerosene are mixed in the injection cavity integrated module (4) to form aerated atomized kerosene (24) aerated and atomized by high temperature oxygen and water vapor, and is laterally sprayed upstream of the cavity (19) through the gas atomization kerosene spray hole (18), and an oxygen-rich jet that enhances combustion performance is formed in the supersonic combustion chamber, and the oxygen-rich jet burns in the cavity (19) to form a high temperature oxygen-rich low speed reflow zone (28).

2. The aerosol injection cavity integrated module according to claim 1, characterized in that: The concave cavity (19) comprises a concave cavity front end face (21) perpendicular to the surface of the injection concave cavity integrated module (4), and a concave cavity bottom face (22) parallel to the surface of the injection concave cavity integrated module (4) and perpendicular to the concave cavity front end face (21), and an inclined surface connecting the concave cavity bottom face (22) and the surface of the injection concave cavity integrated module (4) constitutes a concave cavity rear end face (23).

3. The aerosol injection cavity integrated module according to claim 1, characterized in that: The outlet of the catalytic decomposition module (2) is connected to a sonic flowmeter (3), and the hydrogen peroxide high-temperature decomposition gas generates a critical cross section at the throat of the sonic flowmeter (3), thereby achieving throttling of the hydrogen peroxide high-temperature decomposition gas.

4. The aerosol injection cavity integrated module according to claim 3, characterized in that: The injection cavity integrated module (4) comprises a kerosene inlet pipeline (14) arranged thereon, and a decomposition gas pipeline (7) connected to an outlet of a sonic flowmeter (3); the hydrogen peroxide decomposition gas pipeline (7) is coaxial with and penetrates an atomized kerosene spray hole (18); a plurality of liquid inlet holes (17) are arranged on the decomposition gas pipeline (7), and the decomposition gas pipeline (7) is connected to a kerosene pipeline (16) via the liquid inlet holes (17); The kerosene inlet pipeline (14) is connected to the kerosene pipeline (16) after passing through the annular kerosene confluence chamber (15); a plurality of kerosene pipelines (16) are parallel to the decomposition gas pipeline (7) and are evenly distributed around the circumference thereof; the injection cavity integrated module (4) is provided with an igniter (20) vertically mounted on the cavity bottom surface (22); and the working surface of the igniter (20) is coplanar with the cavity bottom surface (22).

5. The aerosol injection cavity integrated module according to claim 4, characterized in that: The liquid inlet hole (17) is any one of a straight hole, an inclined hole or a tangential hole, the number of the liquid inlet holes (17) is at least 4, and the cross-sectional shape of the liquid inlet hole (17) is at least one of a circular shape, an elliptical shape, a rectangular shape, a diamond shape or a raindrop shape.

6. The aerosol injection cavity integrated module according to claim 1, characterized in that: The number of the atomized kerosene spray holes (18) can be one or more, the cross-sectional shape of the atomized kerosene spray holes (18) is one of a circular, elliptical, rectangular, diamond or raindrop shape, and the axis of the atomized kerosene spray holes (18) is at right angles to the surface of the injection cavity integrated module (4).

7. The aerosol injection cavity integrated module according to claim 2, characterized in that: The length-to-depth ratio of the cavity (19) is 5-8, the angle between the cavity rear end surface (23) and the cavity bottom surface (22) is 40°-50°, and the distance from the cavity front end surface (21) to the atomized kerosene spray hole (18) is 15-30 times the equivalent diameter of the spray hole.

8. The aerosol injection cavity integrated module according to claim 1, characterized in that: The catalytic decomposition module (2) has an outer shell, comprising a hydrogen peroxide inlet (8), a pressing element (9), a distribution orifice plate (10), a catalytic bed (11), an outlet porous structure (12) and a hydrogen peroxide decomposition gas outlet (13) which are sequentially distributed in the outer shell from upstream to downstream; The hydrogen peroxide inlet (8) is connected to the outlet of the supply module (1) through a pipeline (5); the distribution orifice plate (10), the catalyst bed (11), and the outlet porous structure (12) are pressed and fixed in the outer shell from top to bottom in sequence through a pressing element (9); the pressing element (9) is a gasket or a spring; and a plurality of small holes are evenly distributed on the distribution orifice plate (10) so that the hydrogen peroxide can evenly enter the catalyst bed (11).

9. The aerosol injection cavity integrated module according to claim 8, characterized in that: The catalytic bed (11) is a porous structure of 40-70 pieces of 40-mesh silver mesh overlapping structures or a 3D-printed porous structure of a silver-plated nickel-based high-temperature alloy, and the porous structure is a lattice structure with a porosity of 30% to 80%; The outlet porous structure (12) is a porous structure 3D-printed by a nickel-based high-temperature alloy, and the porous structure is a lattice structure or a straight pore structure.

10. A method for enhancing the flame stabilization of injection using the gas atomization injection cavity integrated module according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1, the supply module (1) transports liquid hydrogen peroxide to the hydrogen peroxide inlet (8) of the catalytic decomposition module (2) through the first pipeline (5), and then the hydrogen peroxide flows through the distribution orifice plate (10) in sequence and then evenly passes through the catalyst bed (11), and the outlet porous structure (12) provides a certain back pressure for the hydrogen peroxide flowing through the catalyst bed (11), so that the hydrogen peroxide is fully in contact with the silver mesh or the silver-plated porous structure in the catalyst bed (11), ensuring that the hydrogen peroxide is fully and completely catalytically decomposed into hydrogen peroxide high-temperature decomposition gas, that is, high-temperature oxygen and water vapor; S2, high-temperature oxygen and water vapor flow out from the hydrogen peroxide decomposition gas outlet (13) of the catalytic decomposition module (2), and generate a critical cross section at the throat of the sonic flowmeter (3), thereby achieving throttling of the high-temperature decomposition gas of hydrogen peroxide; S3, the high-temperature decomposition gas of hydrogen peroxide flowing out of the sonic flow meter (3) enters the decomposition gas pipeline (7) through the second pipeline (6), and at the same time, kerosene flows through the kerosene inlet pipeline (14), the kerosene confluence chamber (15), and the kerosene pipeline (16), and then enters the decomposition gas pipeline (7) through the liquid inlet hole (17), and is mixed with high-temperature oxygen and water vapor in the decomposition gas pipeline (7), thereby forming aerated atomized kerosene (24) atomized by the high-temperature oxygen and water vapor; S4, the kerosene (24) atomized by high-temperature oxygen and water vapor is sprayed laterally upstream of the cavity (19) through the atomized kerosene spray hole (18), and forms an atomized kerosene transverse jet (25) in the supersonic combustion chamber; S5. The difference in air flow velocity between the mainstream (26) of the supersonic combustion chamber and the concave cavity (19) forms a concave cavity shear layer (27) at the front end surface (21) of the concave cavity. A portion of the oxygen-enriched atomized kerosene transverse jet (25) oscillates through the concave cavity shear layer (27) and enters the concave cavity (19), where it burns to form a high-temperature, oxygen-enriched, low-speed recirculation zone (28), thereby widening the flame stabilization range.

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