A rotating detonation combustion chamber with supercritical combined injection structure

Abstract

The application relates to the technical field of aero-engines, and provides a rotary detonation combustion chamber with a supercritical combined injection structure, which comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are respectively provided with cooling cavities and injection oil cavities, and high-efficiency heat management is realized through multistage regenerative cooling microchannels. The space between the inner cylinder and the outer cylinder forms a combustion cavity, a throat and an air inlet cavity, and the injection hole group is designed to make fuel mixing more uniform, improve combustion efficiency and stability. An opening and closing piece controls the opening and closing of the injection hole, thereby ensuring accurate oil supply under different working conditions. In addition, the air inlet cone and the variable cross-section design optimize the gas flow characteristics, and further improve the overall performance. The application achieves the effects of significantly improving combustion efficiency, reducing temperature distribution unevenness and improving system stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular to a rotating detonation combustion chamber with a supercritical combined injection structure. BACKGROUND

[0002] The rotating detonation combustion chamber is a new type of propulsion device that utilizes detonation combustion. In this combustion chamber, the detonation waves generated by detonation combustion propagate at supersonic speed in rotation, which can release a large amount of energy in a short time, and has the advantages of high combustion efficiency and high energy density. Because detonation combustion has the advantages of high heat release intensity per unit time, self-pressurization, high combustion efficiency, and low pollutant emission, the propulsion technology based on detonation combustion is an important development trend of future space technology.

[0003] The speed of detonation combustion is extremely fast, and the heat transfer is also very rapid. This makes the combustion chamber wall surface withstand a large amount of heat input in a short time, which is prone to overheating and can produce extremely high temperature and pressure. This extreme thermal environment poses a severe challenge to the structural materials and stable operation of the combustion chamber.

[0004] Designing a thermal protection structure for the detonation combustion chamber can effectively reduce the temperature of the combustion chamber wall surface and prevent the structural material from failing due to high temperature. By using thermal insulation materials, cooling technology and other means, heat transfer to the combustion chamber wall surface can be reduced, thereby protecting the integrity of the structure.

[0005] Setting a cooling structure on the wall surface of the rotating detonation combustion chamber and using the aviation kerosene carried by the aircraft to first enter the combustion chamber wall cooling channel as a coolant to absorb the heat of the wall surface, and then enter the combustion chamber for combustion, is considered an effective method to save the harsh working environment of the hypersonic aircraft. However, for the annular special configuration rotating detonation combustion chamber with an inner cylinder and an outer cylinder, the design of the cooling pipeline is very complex and difficult. It is a difficult problem in the structure improvement process of the inner and outer cylinder detonation combustion chamber to solve the problems of fuel injection and mixing uniformity while ensuring good cooling performance of the detonation combustion chamber. SUMMARY

[0006] In order to improve the problem of a large amount of heat generated by the rotating detonation combustion in a short time and the problems of fuel injection and mixing uniformity, the present application provides a rotating detonation combustion chamber with a supercritical combined injection structure, which adopts the following technical scheme:

[0007] A rotating detonation combustion chamber with a supercritical combined injection structure, comprising: an inner cylinder and an outer cylinder, the outer cylinder being sleeved outside the inner cylinder;

[0008] The inner cylinder comprises an inner cylinder body and an inner cylinder oil injection ring, the inner cylinder oil injection ring is sleeved and fixed outside the inner cylinder body, an inner cylinder cooling cavity is arranged in the side wall of the inner cylinder body, an inner cylinder oil injection cavity is arranged in the inner cylinder oil injection ring, the inner cylinder cooling cavity is in communication with the inner cylinder oil injection cavity, and the inner cylinder cooling cavity is also in communication with the outside;

[0009] The outer cylinder comprises an outer cylinder body and an outer cylinder oil injection ring, a combustion cavity, a throat and an air inlet cavity are formed between the outer cylinder and the inner cylinder, the throat is in communication between the combustion cavity and the air inlet cavity, an outer cylinder cooling cavity is arranged in the side wall of the outer cylinder, an outer cylinder oil injection cavity is arranged in the outer cylinder oil injection ring, the outer cylinder cooling cavity is in communication with the outer cylinder oil injection cavity, the outer cylinder cooling cavity is also in communication with the outside, and the inner cylinder oil injection cavity and the outer cylinder oil injection cavity are both in communication with the throat.

[0010] By adopting the above technical scheme, efficient cooling and fuel injection of the rotary detonation combustion chamber are realized. The inner cylinder and the outer cylinder are respectively provided with independent cooling cavities and oil injection cavities, so that the fuel can be discharged to the corresponding oil injection cavity in time after absorbing the heat of the wall surface, and overheating is prevented. Meanwhile, the oil injection cavities of the inner cylinder and the outer cylinder are in communication with the throat, so that uniform injection and sufficient mixing of the fuel in the high-temperature environment are ensured, and the combustion efficiency and stability are improved. In addition, the design also has good structural strength and durability, and can reliably operate for a long time under extreme conditions.

[0011] Optionally, the inner cylinder cooling cavity comprises a first oil inlet channel and a plurality of first regenerative cooling microchannels, and each first regenerative cooling microchannel is in communication with the first oil inlet channel;

[0012] The outer cylinder cooling cavity comprises a second oil inlet channel and a plurality of second regenerative cooling microchannels, and each second regenerative cooling microchannel is in communication with the second oil inlet channel.

[0013] By adopting the above technical scheme, the inner cylinder cooling cavity comprises a first oil inlet channel and a plurality of first regenerative cooling microchannels, the first regenerative cooling microchannels are in communication with the first oil inlet channel, the fuel from the outside is guided into each first regenerative cooling microchannel along the first oil inlet channel, so that sufficient heat exchange of the fuel on the inner cylinder wall surface is ensured, and the cooling effect is improved. The outer cylinder cooling cavity comprises a second oil inlet channel and a plurality of second regenerative cooling microchannels, which are also in communication with the second oil inlet channel, and the fuel from the outside is guided into each second regenerative cooling microchannel along the second oil inlet channel, so that the cooling capacity of the inner cylinder wall surface is enhanced.

[0014] Optionally, the outer cylinder body comprises a first air inlet cylinder section, a second air inlet cylinder section and a combustion cylinder section, the first air inlet cylinder section is detachably connected with the second air inlet cylinder section, the second air inlet cylinder section is detachably connected with the combustion cylinder section, and the outer cylinder oil injection ring is located between the second air inlet cylinder section and the combustion cylinder section.

[0015] By adopting the above technical scheme, detachable connection between the first air inlet cylinder section, the second air inlet cylinder section and the combustion cylinder section of the outer cylinder is realized, which facilitates maintenance and replacement. This design not only improves the flexibility and maintainability of the equipment, but also adjusts the outer cylinder structure according to different working condition requirements to optimize the combustion performance. The outer cylinder oil injection ring is located between the second air inlet cylinder section and the combustion cylinder section, the height of the outer cylinder oil injection cavity can be changed by changing the outer cylinder oil injection ring, and different diameter sizes of the outer cylinder oil injection ring can be selected to adapt to different incoming flow working conditions.

[0016] Optionally, an outer cylinder oil inlet pipe is arranged on the outer cylinder, and the outer cylinder oil inlet pipe is in communication with the first oil inlet channel;

[0017] The outer cylinder is further sleeved with a first ring pipe and a second ring pipe, and the first ring pipe and the second ring pipe are in communication with each other; the first ring pipe is in communication with a first oil guide branch pipe, one end of the first oil guide branch pipe being in communication with the outer cylinder cooling cavity; the second ring pipe is in communication with a second oil guide branch pipe, one end of the second oil guide branch pipe being in communication with the outer cylinder oil injection cavity.

[0018] By adopting the above technical scheme, the optimization design of the outer cylinder cooling oil circuit is realized. The outer cylinder oil inlet pipe is in communication with the first oil inlet channel, which ensures that the fuel can smoothly enter the outer cylinder cooling cavity for efficient heat exchange to absorb the heat of the outer cylinder wall surface. At the same time, the first ring pipe and the second ring pipe outside the outer cylinder are in communication with each other, forming a closed circulation system, which further improves the flowability and uniformity of the fuel in the cooling process. The outer cylinder oil inlet pipe guides the fuel with lower temperature into the outer cylinder cooling cavity, ensuring the persistence of the cooling effect. The second oil guide branch pipe guides the heated fuel to the outer cylinder oil injection cavity, so that it can be injected into the combustion chamber in time to participate in the combustion process, thereby improving the working efficiency and stability of the entire combustion chamber.

[0019] Optionally, a flow-around shell is further fixed on the inner side wall of the inner cylinder, and the flow-around shell is in communication with the inner cylinder cooling cavity;

[0020] A rib plate is fixed on the outer side wall of the inner cylinder, a plurality of rib plates are arranged at intervals in the direction of the axis of the inner cylinder; an oil inlet flow channel is arranged in the rib plate, the oil inlet channel is in communication with the flow-around shell, the oil inlet flow channel is in communication with an inner cylinder oil inlet pipe, and one end of the inner cylinder oil inlet pipe is located outside the outer cylinder.

[0021] By adopting the technical scheme, the flow shell is communicated with the inner cylinder cooling cavity, the cooling effect can be further improved, and the inner cylinder wall surface can maintain good thermal stability in a high temperature environment. The oil inlet flow channel in the rib plate not only enhances the structural strength, but also optimizes the fuel flow path, improves the cooling efficiency and injection performance. In addition, one end of the inner cylinder oil inlet pipe is located outside the outer cylinder, which facilitates the connection and maintenance of the external oil supply system, and ensures the reliability and convenience of the entire combustion chamber system.

[0022] Optionally, the inner cylinder injection oil cavity is provided with a first injection hole group on the inner side wall close to the throat, the first injection hole group includes a plurality of first injection holes and second injection holes, and the diameter of the first injection hole is smaller than that of the second injection hole.

[0023] The outer cylinder injection oil cavity is provided with a second injection hole group on the inner side wall close to the throat, the second injection hole group includes a plurality of third injection holes and fourth injection holes, and the diameter of the third injection hole is smaller than that of the fourth injection hole.

[0024] The inner cylinder is further provided with an opening and closing piece, which is used to simultaneously open or close the second injection hole and the fourth injection hole.

[0025] By adopting the above technical scheme, the first injection hole group and the second injection hole group are respectively arranged on the inner side wall close to the throat of the inner cylinder and the outer cylinder injection oil cavity of the rotary detonation combustion chamber, each group contains injection holes with different diameters. This design can flexibly adjust the injection mode according to different working conditions, realize automatic switching of the injection holes during the startup stage and normal operation stage of the combustion chamber, and ensure the optimal injection effect. The first injection hole and the third injection hole are suitable for the initial injection of liquid fuel, and the second injection hole and the fourth injection hole are suitable for the injection of fuel in a supercritical state. The opening and closing piece controls different injection holes on the inner and outer cylinders at the same time, ensures uniform mixing and efficient combustion of fuel, and improves combustion efficiency and system stability.

[0026] Optionally, a plurality of first injection holes are arranged at equal intervals around the inner cylinder axis, and the second injection hole is arranged between any two adjacent first injection holes.

[0027] A plurality of third injection holes are arranged at equal intervals around the outer cylinder axis, and the fourth injection hole is arranged between any two adjacent third injection holes, and the second injection hole and the fourth injection hole are arranged opposite to each other.

[0028] The opening and closing piece includes a connecting ring and an opening and closing pad, the connecting ring is sleeved on the outer cylinder oil injection ring and is rotationally connected with the outer cylinder oil injection ring, and a plurality of opening and closing pads are arranged at intervals around the connecting ring axis, and the opening and closing pad and the fourth injection hole are arranged one by one.

[0029] By adopting the above technical solutions, the uniform distribution of the first and second injection holes on the inner cylinder and the uniform distribution of the third and fourth injection holes on the outer cylinder ensure the uniform mixing and atomization of the fuel in the intake throat, and improve the combustion efficiency and stability. The second injection hole between the two adjacent first injection holes and the fourth injection hole between the two adjacent third injection holes are arranged opposite to each other, which further enhances the mixing effect of the fuel and air and improves the overall performance of the combustion chamber. The design of the connecting ring and the opening and closing pad enables flexible control of the opening and closing states of the second and fourth injection holes, thereby achieving precise adjustment of the injection mode under different working conditions, especially during the switching process in the starting stage and the normal running stage, ensuring the reliability and adaptability of fuel injection.

[0030] Optionally, a turning lever is fixed on the opening and closing pad, and an adjusting waist hole is formed in the side wall of the outer cylinder oil injection ring.

[0031] A sealing element is arranged at the adjusting waist hole to seal the adjusting waist hole when the turning lever slides.

[0032] By adopting the above technical solutions, the cooperation of the turning lever and the adjusting waist hole realizes precise control of the opening and closing element, ensuring the timely opening and closing of the injection hole under different working conditions. The application of the sealing element effectively prevents oil leakage, improves the reliability and safety of the system.

[0033] Optionally, an intake cone is arranged at one end of the inner cylinder close to the intake cavity, and the cross-sectional area of the intake cone gradually decreases away from the inner cylinder oil injection ring.

[0034] By adopting the above technical solutions, the design of the intake cone effectively reduces the impact of high-speed airflow on the connecting rib plate structure of the inner cylinder and the outer cylinder, reduces the resistance, and improves the overall stability of the combustion chamber. The gradually decreasing cross-sectional area design helps to guide the smooth entry of airflow into the combustion chamber, optimizes the intake condition, and improves the combustion efficiency.

[0035] Optionally, the area surrounded by the inner wall at one end of the combustion cavity gradually decreases towards the throat, and the area surrounded by the inner wall at one end of the intake cavity gradually decreases towards the throat.

[0036] By adopting the above technical solutions, the area surrounded by the inner wall at one end of the combustion cavity gradually decreases towards the throat, which helps to guide the flow of gas and improve the combustion efficiency and stability. The area surrounded by the inner wall at one end of the intake cavity gradually decreases towards the throat, which can effectively reduce the intake resistance, optimize the gas flow path, and improve the air flow and mixing uniformity into the combustion chamber, thereby enhancing the combustion effect.

[0037] In summary, the present application includes at least one of the following beneficial effects:

[0038] 1. In the present application, by setting the first regenerative cooling channel in the inner and outer cylinder sidewall and keeping the aviation kerosene above the critical pressure, the heat transfer deterioration caused by film boiling is avoided, and high-efficiency cooling and long-term stable operation are realized;

[0039] 2. The outer cylinder in the present application adopts a segmented modular design that can be disassembled and set, and the size of the outer cylinder oil inlet ring can be adjusted according to different working conditions, improving the flexibility and adaptability of fuel injection and enhancing the working range and performance of the combustion chamber;

[0040] 3. In the present application, the design of the first, second, third, and fourth injection holes takes into account the physical property changes of fuel at different temperatures, and different aperture injection holes are used in the starting stage and normal running stage respectively, ensuring uniform fuel injection and atomization effect and improving combustion efficiency and stability. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the overall structure schematic diagram of the rotating detonation combustion chamber with supercritical combined injection structure of the present application;

[0042] Figure 2 is the cross-sectional structure schematic diagram of the rotating detonation combustion chamber with supercritical combined injection structure of the embodiment of the present application;

[0043] Figure 3 is the cross-sectional structure schematic diagram of the rotating detonation combustion chamber with supercritical combined injection structure of the embodiment of the present application from another perspective;

[0044] Figure 4 is Figure 2 is the local enlarged structure schematic diagram at A in FIG. 8;

[0045] Figure 5 is the explosion structure schematic diagram of the rotating detonation combustion chamber with supercritical combined injection structure of the embodiment of the present application;

[0046] Figure 6 is Figure 3 is the local enlarged structure schematic diagram at B in FIG. 9.

[0047] Explanation of reference signs: 1, inner cylinder; 11, inner cylinder body; 111, inner cylinder cooling cavity; 1111, first oil inlet channel; 1112, first regenerative cooling microchannel; 12, inner cylinder oil injection ring; 121, inner cylinder oil injection cavity; 122, first group of injection holes; 1221, first injection hole; 1222, second injection hole; 13, air inlet cone; 2, outer cylinder; 21, outer cylinder body; 211, first air inlet cylinder section; 212, second air inlet cylinder section; 213, combustion cylinder section; 214, outer cylinder cooling cavity; 2141, second oil inlet channel; 2142, second regenerative cooling microchannel; 22, outer cylinder oil injection ring; 221, outer cylinder oil injection cavity; 222, second group of injection holes; 2221, third injection hole; 2222, fourth injection hole; 223, adjusting waist hole; 23, combustion cavity; 24, throat; 25, air inlet cavity; 26, outer cylinder oil inlet pipe; 3, first ring pipe; 31, first oil guide branch pipe; 32, first insertion pipe; 4, second ring pipe; 41, second oil guide branch pipe; 42, second insertion pipe; 5, flow-around shell; 6, rib plate; 61, oil inlet flow channel; 7, inner cylinder oil inlet pipe; 8, opening and closing member; 81, connecting ring; 82, opening and closing pad; 83, lever; 9, sealing member. DETAILED DESCRIPTION

[0048] The following will be described in detail below with reference to the accompanying drawings. Figures 1-6 The present application is further described in detail.

[0049] Reference will be made to Figure 1 and Figure 2The rotating detonation combustion chamber with the supercritical combined injection structure provided by the embodiment of the application comprises an inner cylinder 1 and an outer cylinder 2, and the outer cylinder 2 is sleeved outside the inner cylinder 1. The inner cylinder 1 comprises an inner cylinder body 11 and an inner cylinder oil injection ring 12, the inner cylinder oil injection ring 12 is sleeved outside the inner cylinder body 11 and is integrally formed with the inner cylinder body 11, and an inner cylinder injection oil cavity 121 is formed in the inner cylinder oil injection ring 12. An inner cylinder cooling cavity 111 is processed in the side wall of the inner cylinder body 11, the inner cylinder cooling cavity 111 comprises a first oil inlet channel 1111 and a plurality of first regenerative cooling microchannels 1112, the first oil inlet channel 1111 is arranged at both ends of the inner cylinder cooling cavity 111, and the plurality of first regenerative cooling microchannels 1112 are communicated between the two first oil inlet channels 1111. A flow-around shell 5 is further fixed on the inner side wall of the inner cylinder body 11, and the flow-around shell 5 is arranged at intervals around the axis of the inner cylinder body 11; in this embodiment, four flow-around shells 5 are arranged. Referring to FIG. 2, a rib plate 6 is fixed on the outer side wall of the inner cylinder 1, the rib plate 6 is arranged at intervals around the axis direction of the inner cylinder 1, and one end of the rib plate 6 is fixedly connected with the inner side wall of the outer cylinder 2. An oil inlet flow channel 61 is arranged in the rib plate 6, and one end of the rib plate 6 is located in the flow-around shell 5, so that the oil inlet flow channel 61 is communicated with the flow-around shell 5; the other end of the oil inlet flow channel 61 is communicated with an inner cylinder oil inlet pipe 7, and one end of the inner cylinder oil inlet pipe 7 is located outside the outer cylinder 2. After the oil is injected along the inner cylinder oil inlet pipe 7, the oil enters the oil inlet flow channel 61, the flow-around shell and the inner cylinder cooling cavity 111 in sequence, and then enters the inner cylinder injection oil cavity 121 along the inner cylinder cooling cavity 111. This design not only enhances the structural strength of the inner cylinder 1, but also effectively improves the cooling effect of the fuel.

[0050] With reference to Figure 3 And Figure 4 The outer cylinder 2 comprises an outer cylinder body 21 and an outer cylinder oil injection ring 22, the inner side wall of the outer cylinder body 21 and the outer side wall of the inner cylinder body 11 form a combustion cavity 23 and an air inlet cavity 25; the inner side wall of the outer cylinder oil injection ring 22 and the outer side wall of the inner cylinder oil injection ring 12 form a throat 24, and the throat 24 is communicated between the combustion cavity 23 and the air inlet cavity 25. The area surrounded by the inner wall at one end of the combustion cavity 23 gradually decreases towards the direction close to the throat 24, and the area surrounded by the inner wall at one end of the air inlet cavity 25 gradually decreases towards the direction close to the throat 24. This convergent-divergent type design helps to improve the mixing effect and combustion speed of the gas. The inner cylinder 1 is integrally formed with an air inlet cone 13 at one end close to the air inlet cavity 25, and the cross-sectional area of the air inlet cone 13 gradually decreases away from the inner cylinder oil injection ring 12. This design can reduce the air inlet resistance, ensure that the gas enters the air inlet cavity 25 smoothly, and improve the combustion efficiency.

[0051] With reference to Figure 3The outer cylinder 2 is provided with an outer cylinder cooling cavity 214 in the side wall, and the outer cylinder oil injection ring 22 is provided with an outer cylinder oil injection cavity 221; the outer cylinder cooling cavity 214 comprises a second oil inlet channel 2141 and a plurality of regenerative cooling microchannels, and the outer cylinder cooling cavity 214 is provided with the second oil inlet channel 2141 at both ends, and each regenerative cooling microchannel is connected between the two second oil inlet channels 2141. The inner cylinder oil injection cavity 121 and the outer cylinder oil injection cavity 221 are connected with the throat 24. The inner cylinder 1 and the outer cylinder 2 are respectively provided with oil supply and cooling, so that high-efficiency combustion and cooling are realized.

[0052] With reference to Figure 3 The outer cylinder body 21 comprises a first air inlet cylinder segment 211, a second air inlet cylinder segment 212 and a combustion cylinder segment 213, and a ignition interface is further fixed on the combustion cylinder segment 213 and connected with the combustion cavity 23. The first air inlet cylinder segment 211 and the second air inlet cylinder segment 212 are detachably connected through flanges and bolts, the second air inlet cylinder segment 212 and the combustion cylinder segment 213 are also detachably connected through flanges, and the outer cylinder oil injection ring 22 is clamped between the second air inlet cylinder segment 212 and the combustion cylinder segment 213, so as to realize detachable connection on the outer cylinder body 21. The segmented design of the outer cylinder 2 facilitates maintenance and replacement, and improves the flexibility of the system.

[0053] With reference to Figure 4 And Figure 5 The outer cylinder body 21 is provided with a plurality of outer cylinder oil inlet pipes 26 which are arranged at intervals around the axis of the combustion cylinder segment 213 and are connected with the same second oil inlet channel 2141. The combustion cylinder segment 213 is further sleeved with the first ring pipe 3, and the second air inlet cylinder segment 212 is further sleeved with the second ring pipe 4; the first ring pipe 3 is connected with a plurality of first insertion pipes 32 on one side, the second ring pipe 4 is connected with a plurality of second insertion pipes 42 on one side, and the first insertion pipes 32 are inserted into the second insertion pipes 42, so as to realize the connection between the first ring pipe 3 and the second ring pipe 4. The first ring pipe 3 is connected with a first oil guide branch pipe 31, and the first oil guide branch pipe 31 is arranged at intervals around the axis of the first ring pipe 3 and is connected with one second oil inlet channel 2141 in the outer cylinder cooling cavity 214 at one end; the second ring pipe 4 is connected with a second oil guide branch pipe 41, and the second oil guide branch pipe 41 is arranged at intervals around the axis of the first ring pipe 3 and is connected with the outer cylinder oil injection cavity 221 at one end. Such a double-ring pipe design ensures uniform distribution of fuel, improves the stability and reliability of the system. After the oil is injected into the outer cylinder oil inlet pipe 26, the oil flows into the outer cylinder cooling cavity 214, the second oil guide branch pipe 41, the second ring pipe 4 and the first ring pipe 3 in sequence, and then enters the outer cylinder oil injection cavity 221 along the first oil guide branch pipe 31.

[0054] With reference to Figure 6The first injection hole group 122 is arranged on the inner side wall of the throat 24, and comprises a plurality of first injection holes 1221 and second injection holes 1222. The diameter of the first injection hole 1221 is smaller than that of the second injection hole 1222.

[0055] Further, the first injection holes 1221 are arranged at equal intervals around the axis of the inner cylinder 1, and each of the adjacent two first injection holes 1221 is provided with a second injection hole 1222. The third injection holes 2221 are arranged at equal intervals around the axis of the outer cylinder 2, and each of the adjacent two third injection holes 2221 is provided with a fourth injection hole 2222. The second injection hole 1222 and the fourth injection hole 2222 are arranged in one-to-one correspondence. The arrangement of the first injection hole group 122 and the second injection hole group ensures the uniform distribution of fuel in the entire throat 24, thereby improving the combustion efficiency.

[0056] Referring to Figure 5 and Figure 6 , the inner cylinder 1 is provided with an opening and closing member 8. The opening and closing member 8 comprises a connecting ring 81 and an opening and closing pad 82. The connecting ring 81 is sleeved on the outer cylinder oil injection ring 12 and is rotationally connected with the outer cylinder oil injection ring 12. The connecting ring 81 is arranged at intervals and has two connecting rings 81. The opening and closing pad 82 is fixed between the two connecting rings 81. The opening and closing pad 82 is arranged at intervals around the axis of the connecting ring 81, and the opening and closing pad 82 is arranged in one-to-one correspondence with the second injection hole 1222. Figure 4 Referring to , the connecting ring 81 is fixed with a lever 83, and the outer cylinder oil injection ring 22 is provided with an adjusting waist hole 223. One end of the lever 83 is slidably arranged in the adjusting waist hole 223. The adjusting waist hole 223 is provided with a sealing member 9. The sealing member 9 can be a flexible diaphragm. The flexible diaphragm is fixed at the adjusting waist hole 223 to seal the adjusting waist hole 223 when the lever 83 slides. Such a design not only ensures the sealing of the system, but also facilitates manual adjustment by the operator.

[0057] In other embodiments, the sealing member 9 can also be a sealing piece larger than the adjusting waist hole 223, and the sealing piece is slidably connected to one side of the adjusting waist hole 223.

[0058] When the automatic switching of the injection holes is realized in the starting stage and the normal operation stage of the combustion chamber, the optimal injection effect is ensured. The first injection hole 1221 and the third injection hole 2221 are suitable for the initial injection of liquid fuel, and the second injection hole 1222 and the fourth injection hole 2222 are suitable for the injection of fuel in the supercritical state. The opening and closing of the second injection hole 1222 and the fourth injection hole 2222 can be realized by the opening and closing of the second injection hole 1222 and the fourth injection hole 2222. This design can adjust the size of the injection hole according to different working conditions, and ensure the optimal injection effect of the fuel at different temperatures.

[0059] The implementation principle of the embodiment is: through the independent oil supply and cooling system of the inner cylinder 1 and the outer cylinder 2, the effective protection of the inner wall of the inner cylinder 1 and the outer cylinder 2 is realized, and the efficient injection and combustion of fuel are ensured. Especially through the change of the physical properties of the fuel in the supercritical state, the problem of easy blockage of the traditional injection system under high temperature conditions is solved, and the reliability and life of the combustion chamber are improved. In addition, the modular design and flexible injection hole adjustment mechanism make the combustion chamber adapt to various working conditions, and improve the applicability and economy of the system.

[0060] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A rotating detonation combustion chamber with a supercritical combined injection structure, characterized in that, include: The inner cylinder (1) and the outer cylinder (2) are fitted around the inner cylinder (1). The inner cylinder (1) includes an inner cylinder body (11) and an inner cylinder oil injection ring (12). The inner cylinder oil injection ring (12) is fitted around and fixed to the inner cylinder body (11). An inner cylinder cooling chamber (111) is provided in the side wall of the inner cylinder body (11). An inner cylinder injection oil chamber (121) is provided in the inner cylinder oil injection ring (12). The inner cylinder cooling chamber (111) is connected to the inner cylinder injection oil chamber (121), and the inner cylinder cooling chamber (111) is also connected to the outside. The outer cylinder (2) includes an outer cylinder body (21) and an outer cylinder oil injection ring (22). The outer cylinder (2) and the inner cylinder (1) form a combustion chamber (23), a throat (24) and an air intake chamber (25), and the throat (24) is connected between the combustion chamber (23) and the air intake chamber (25); the outer cylinder (2) has an outer cylinder cooling chamber (214) in the side wall, and the outer cylinder has an outer cylinder injection chamber (221) in the outer cylinder injection ring (22). The outer cylinder cooling chamber (214) is connected to the outer cylinder injection chamber (221), and the outer cylinder cooling chamber (214) is also connected to the outside. The inner cylinder injection chamber (121) and the outer cylinder injection chamber (221) are both connected to the throat (24); The inner cylinder cooling chamber (111) includes a first oil inlet channel (1111) and multiple first regenerative cooling microchannels (1112), each of the first regenerative cooling microchannels (1112) being connected to the first oil inlet channel (1111); the outer cylinder cooling chamber (214) includes a second oil inlet channel (2141) and multiple second regenerative cooling microchannels (2142), each of the second regenerative cooling microchannels (2142) being connected to the second oil inlet channel (2141); The inner cylinder injection chamber (121) has a first nozzle group (122) on its inner wall near the throat (24). The first nozzle group (122) includes multiple first nozzles (1221) and second nozzles (1222), and the diameter of the first nozzles (1221) is smaller than that of the second nozzles (1222). The outer cylinder injection chamber (221) has a second nozzle group (222) on its inner wall near the throat (24). The second nozzle group (222) includes multiple third nozzles (2221) and fourth nozzles (2222), and the diameter of the third nozzles (2221) is smaller than that of the fourth nozzles (2222). The inner cylinder (1) is also provided with an opening and closing member (8), which is used to open or close the second nozzles (1222) and the fourth nozzles (2222) at the same time.

2. The rotary detonation combustion chamber with a supercritical combined injection structure according to claim 1, characterized in that, The outer cylinder body (21) includes a first air intake section (211), a second air intake section (212), and a combustion cylinder section (213). The first air intake section (211) and the second air intake section (212) are detachably connected, and the second air intake section (212) and the combustion cylinder section (213) are detachably connected. The outer cylinder oil injection ring (22) is located between the second air intake section (212) and the combustion cylinder section (213).

3. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 2, characterized in that, The outer cylinder (2) is provided with an outer cylinder oil inlet pipe (26), which is connected to the first oil inlet channel (1111); the outer cylinder (2) is also fitted with a first ring pipe (3) and a second ring pipe (4), and the first ring pipe (3) and the second ring pipe (4) are connected to each other; the first ring pipe (3) is connected to a first oil guide branch pipe (31), one end of the first oil guide branch pipe (31) is connected to the outer cylinder cooling chamber (214); the second ring pipe (4) is connected to a second oil guide branch pipe (41), one end of the second oil guide branch pipe (41) is connected to the outer cylinder injection oil chamber (221).

4. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 1, characterized in that, A flow-around shell (5) is also fixed on the inner side wall of the inner cylinder (1), and the flow-around shell (5) is connected to the inner cylinder cooling chamber (111); a rib plate (6) is fixed on the outer side wall of the inner cylinder (1), and multiple rib plates (6) are spaced apart around the axis of the inner cylinder (1); an oil inlet channel (61) is provided in the rib plate (6), and the oil inlet channel (61) is connected to the flow-around shell (5), and the oil inlet channel (61) is connected to the inner cylinder oil inlet pipe (7), one end of the inner cylinder oil inlet pipe (7) is located outside the outer cylinder (2).

5. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 1, characterized in that, The first spray hole (1221) is provided at equal intervals around the axis of the inner cylinder (1), and a second spray hole (1222) is provided between each two adjacent first spray holes (1221); the third spray hole (2221) is provided at equal intervals around the axis of the outer cylinder (2), and a fourth spray hole (2222) is provided between each two adjacent third spray holes (2221), and the second spray hole (1222) and the fourth spray hole (2222) are arranged opposite to each other; the opening and closing component (8) includes a connecting ring (81) and an opening and closing pad (82), the connecting ring (81) is sleeved on the outer side of the inner cylinder oil injection ring (12) and rotatably connected to the inner cylinder oil injection ring (12), and the opening and closing pad (82) is provided at equal intervals around the axis of the connecting ring (81), and the opening and closing pad (82) is arranged corresponding to the fourth spray hole (2222).

6. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 5, characterized in that, A lever (83) is fixed on the opening and closing pad (82). An adjustment waist hole (223) is provided on the side wall of the outer cylinder oil spray ring (22). One end of the lever (83) is slidably disposed in the adjustment waist hole (223). A sealing element (9) is provided at the adjustment waist hole (223) to seal the adjustment waist hole (223) when the lever (83) slides.

7. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 1, characterized in that, An intake cone (13) is provided at one end of the inner cylinder (1) near the intake chamber (25), and the cross-sectional area of ​​the intake cone (13) gradually decreases in the direction away from the inner cylinder oil injection ring (12).

8. A rotating detonation combustion chamber with a supercritical combined injection structure according to claim 1, characterized in that, The area enclosed by the inner wall of one end of the combustion chamber (23) gradually decreases towards the throat (24), and the area enclosed by the inner wall of one end of the air intake chamber (25) gradually decreases towards the throat (24).

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