A strut jet and method of making a strut

Abstract

The application discloses a support plate injector and a support plate preparation method, and relates to the field of air-breathing engines, to solve the problem that a traditional high-temperature alloy support plate needs to be cooled by a coolant. The support plate injector comprises a support plate body having a mounting flange and an injection pipe connected thereto, a first channel is arranged through the inside of the mounting flange and the injection pipe, a plurality of injection holes are arranged on the side wall of the first channel, the plurality of injection holes are arranged at intervals along the extension direction of the first channel, and the mounting flange and the injection pipe are arranged in opposite inclinations, and the support plate body is used for injecting fuel into a combustion chamber through the injection holes; an oil inlet component has a connecting part and an oil inlet part connected thereto, a second channel is arranged through the inside of the connecting part and the oil inlet part and is communicated with the first channel, and the second channel is used for being communicated with a fuel supply source; and a fastening component is used for fixing the support plate body and the oil inlet component by penetrating through the connecting part and the outer wall of the combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of air-breathing engines, and more specifically to a support plate injector and a method for preparing the support plate. Background Technology

[0002] Currently, traditional high-temperature alloy support plates require fuel cooling during operation. As the incoming flow velocity increases, the corresponding increase in total incoming flow temperature and pressure, coupled with the reduction in coolant (fuel) supply, makes the thermal protection method of high-temperature alloy + active cooling insufficient. Therefore, it is necessary to use high-temperature resistant composite materials to manufacture the support plates. The support plates are integrally molded, and the overall structure is made of composite materials, while the combustion chamber body is mostly made of metal. This raises the issue of connecting dissimilar materials between the support plates and the combustion chamber body. The brittleness of composite materials makes it impossible to directly machine threaded holes. The support plates are connected to the combustion chamber by bolts. Furthermore, the composite material support plate structure is not repairable and may suffer structural damage after repeated long-term use. When the support plates need to be replaced, disassembly is inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide a support plate injector and a support plate preparation method, which facilitates the disassembly and replacement of the support plate after long-term use.

[0004] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a support plate injector, comprising: The support plate body has a connected mounting flange and injection pipe. A first channel is provided through the mounting flange and injection pipe. Multiple injection holes are opened on the side wall of the first channel near the injection pipe. The multiple injection holes are arranged at intervals along the extension direction of the first channel. The mounting flange and injection pipe are inclined relative to each other. The support plate body is used to inject fuel into the combustion chamber through the injection holes. The oil inlet component has a connecting part and an oil inlet part connected together. A second channel is provided through the interior of the connecting part and the oil inlet part. The second channel is connected to the first channel and is used to connect to the fuel supply source. Fastening components are used to secure the support plate body and the oil inlet components by passing through the connection and the outer wall of the combustion chamber.

[0005] Optionally, in the above-mentioned support plate injector, the support plate body includes a support plate preform and a composite coating covering the surface of the support plate preform. The material of the support plate preform is C / C-SiC ceramic matrix composite material or SiCf / SiC ceramic matrix composite material.

[0006] Optionally, in the above-mentioned support plate injector, the composite coating includes a SiC-HfC-SiC composite coating or a ZrC-SiC-ZrC composite coating.

[0007] The angle between the mounting flange and the windward side of the injection pipe near the upstream direction of the airflow is 40° to 50°.

[0008] Optionally, in the above-mentioned support plate injector, the windward side of the injection pipe near the upstream direction of the airflow is arc-shaped, and the leeward side of the injection pipe near the downstream direction of the airflow is square.

[0009] Optionally, the above-mentioned support plate injector also includes a reinforcing rib, which is disposed in the angle region between the mounting flange and the leeward side of the injection pipe near the downstream direction of the airflow.

[0010] Optionally, in the above-mentioned support plate injector, a sealing groove is provided on the side of the mounting flange near the oil inlet component, and the support plate injector also includes a sealing component disposed in the sealing groove.

[0011] Compared with the prior art, when adopting the above technical solution, the operator inserts the injection pipe of the support plate body through the outer wall of the combustion chamber and into the combustion chamber. The mounting flange overlaps the outer wall of the combustion chamber, and the connecting part of the fuel inlet component is pressed tightly against the outer wall of the combustion chamber. After the second channel is connected to the first channel, the support plate body and the fuel inlet component are fixed by fastening components passing through the connecting part and the outer wall of the combustion chamber, thus completing the installation of the support plate injector. Fuel is supplied by the fuel supply source and sequentially passes through the second channel, the first channel, and the injection hole to inject fuel into the combustion chamber. Compared with the traditional one-piece molded support plate, this application adopts a separate structure for the support plate body and the fuel inlet component, and the fastening components facilitate installation and disassembly. After repeated long-term use, the local structure of the support plate body is more prone to damage than the fuel inlet component due to the high-temperature working environment caused by the support plate body extending into the combustion chamber to inject fuel. When it is necessary to replace the support plate body, only the local structure of the support plate injector can be replaced, that is, only the support plate body is replaced, without having to replace the entire structure of the support plate injector after repeated use, which is convenient for operation.

[0012] In a second aspect, the present invention also provides a method for preparing a support plate, for preparing a support plate body of a support plate injector as described in any of the above claims, the method comprising: A contour mold is provided based on the structure of the support plate body; Carbon cloth is laid layer by layer on the surface of the mold, and the multiple layers of carbon cloth are needle-punched. The carbon cloth is overlapped at the overlap position, and the overlap is stitched along the generatrix direction parallel to the extension direction of the first channel to obtain the support plate matrix structure. The support plate matrix structure is densified by reactive melt infiltration to obtain the support plate preform. A composite coating is applied to the surface of the support preform using a chemical vapor deposition process to obtain the support body.

[0013] Optionally, in the above-mentioned method for preparing the support plate, the overlapping part is sewn along the generatrix direction parallel to the extension direction of the first channel by a sewing process, including: the overlapping part is sewn along the generatrix direction parallel to the extension direction of the first channel by a sewing process using 6K carbon fiber or 12K carbon fiber.

[0014] Optionally, in the above-mentioned method for preparing the support plate, the support plate substrate is densified by reactive melt infiltration, including: The substrate of the support plate was impregnated with a polycarbohafnium solution until the density reached 1.8 kg / cm³. 3 ; The support plate preform is obtained by cyclic impregnation with polycarbosilane solution until the support plate matrix is ​​densified.

[0015] Compared to traditional composite support plates, this application uses a needle punching and stitching molding process to obtain the support plate matrix structure. The matrix structure is then densified and covered with a composite coating. This allows the resulting support plate body to extend into the combustion chamber and be directly impacted by airflow under high pressure. The structural strength of the support plate body is ensured by appropriate carbon fiber orientation, the needle punching and stitching support plate preform reinforcement method, the prepared composite material, and the composite coating. This reduces fuel leakage and improves the support plate body's resistance to oxidation, ablation, and erosion. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a support plate injector provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the support plate body in a support plate injector provided in an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure; Figure 4 This is a schematic diagram of the ply structure at the end of the support plate body in a support plate injector provided in an embodiment of the present invention; Figure 5 This is a process flow diagram of a support plate preparation method provided in an embodiment of the present invention.

[0017] Figure label: 1-Support plate body; 11-Mounting flange; 12-Injection pipe; 121-First channel; 122-Injection hole; 13-Reinforcing rib; 14-Sealing groove; 2-Oil inlet component; 21-Connecting part; 211-Second channel; 22-Oil inlet part; 3-Fastening component; 4-Combustion chamber; 5-Carbon cloth. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] like Figures 1-4As shown in the figure, an embodiment of the present invention provides a support plate injector, comprising: a support plate body 1, an oil inlet component 2, and a fastening component 3.

[0024] The support plate body 1 has a connected mounting flange 11 and an injection pipe 12. A first channel 121 is provided through the inside of the mounting flange 11 and the injection pipe 12. The side wall of the first channel 121 near the injection pipe 12 is provided with multiple injection holes 122. The multiple injection holes 122 are arranged at intervals along the extension direction of the first channel 121. The mounting flange 11 and the injection pipe 12 are inclined relative to each other. The support plate body 1 is used to inject fuel into the combustion chamber 4 through the injection holes 122. The fuel inlet component 2 has a connected connecting part 21 and a fuel inlet part 22. A second channel 211 is provided through the inside of the connecting part 21 and the fuel inlet part 22. The second channel 211 communicates with the first channel 121 and is used to communicate with the fuel supply source. The fastening component 3 is used to fix the support plate body 1 and the fuel inlet component 2 through the connecting part 21 and the outer wall of the combustion chamber 4.

[0025] In specific implementation, such as Figure 1 As shown, the operator inserts the injection pipe 12 of the support plate body 1 through the outer wall of the combustion chamber 4 and into the interior of the combustion chamber 4. The mounting flange 11 overlaps the outer wall of the combustion chamber 4. Then, the connecting part 21 of the oil inlet component 2 is pressed tightly against the outer wall of the combustion chamber 4, and after the second channel 211 is connected to the first channel 121, the support plate body 1 and the oil inlet component 2 are fixed by the fastening component 3 passing through the connecting part 21 and the outer wall of the combustion chamber 4, thus completing the installation of the support plate injector. Fuel is supplied from the fuel supply source and injected into the combustion chamber 4 through the second channel 211, the first channel 121, and the injection hole 122. Compared to the traditional one-piece molded support plate, this application adopts a separate structure of support plate body 1 and oil inlet component 2, and uses fastening component 3 for easy installation and disassembly. After repeated long-term use, since the support plate body 1 extends into the combustion chamber 4 to inject fuel, the high-temperature working environment makes the local structure of the support plate body 1 more prone to damage than the oil inlet component 2. When it is necessary to replace the support plate body 1, only the local structure of the support plate injector can be replaced, that is, only the support plate body 1 needs to be replaced, without having to replace the entire structure of the support plate injector after repeated use, which is convenient for operation.

[0026] Specifically, in this embodiment, the support plate body 1 includes a support plate preform and a composite coating covering the surface of the support plate preform. The material of the support plate preform is a C / C-SiC ceramic matrix composite material or a SiCf / SiC ceramic matrix composite material. Since the support plate body 1 needs to inject fuel and contact the high-temperature airflow within the combustion chamber 4 during operation, the C / C-SiC ceramic matrix composite material used in the support plate preform of the support plate body 1 possesses ultra-high temperature resistance, thermal shock resistance, lightweight, corrosion resistance, high-temperature stability, and erosion resistance. Under extreme thermal shock, high pressure, and high-speed flow field environments, it can ensure the structural stability and functional reliability of the support plate body 1, extending its service life. Of course, the material of the support plate preform in the support plate body 1 can also be a SiCf / SiC ceramic matrix composite material or other composite materials, as long as the support plate body 1 can function normally under the high-temperature and high-pressure environment within the combustion chamber 4.

[0027] Specifically, in this embodiment, the composite coating includes a SiC-HfC-SiC composite coating or a ZrC-SiC-ZrC composite coating. Both the SiC-HfC-SiC and ZrC-SiC-ZrC composite coatings possess excellent high-temperature oxidation resistance, erosion resistance, and wear resistance, achieving uniform coverage on the surface of the support precast body and extending the service life of the support body 1 material under high-temperature and high-pressure environments. Of course, other composite coatings can also be applied to the surface of the support precast body. Operators can select appropriate composite coatings based on the actual support body 1 material to improve the strength and reliability of the support body 1 structure.

[0028] like Figure 2As shown, specifically, in this embodiment, the angle between the mounting flange 11 and the windward side of the injection pipe 12 near the upstream direction of the airflow is 40° to 50°. For example, the angle α between the mounting flange 11 and the windward side of the injection pipe 12 near the upstream direction of the airflow can be 40°, 42°, 45°, 47°, 50°, etc., and preferably, the angle α between the mounting flange 11 and the windward side of the injection pipe 12 near the upstream direction of the airflow is 45°. With this setup, operators can select different angles α for the injection pipe 12 according to actual work needs. Considering that an angle α that is too large or too small will have adverse effects, the injection pipe 12 adopts an angle α of 40°~50° during the operation of the combustion chamber 4. This allows the high-speed airflow to flow along the windward side of the injection pipe 12, forming a stable low-pressure backflow zone on the leeward side of the injection pipe 12 (i.e., the structural surface of the support plate body 1 near the downstream direction of the airflow). This ensures that the injection pipe 12 of the support plate body 1 has a suitable sweep angle relative to the airflow direction in the combustion chamber 4, guaranteeing the stability of the airflow in the combustion chamber 4, reducing the aerodynamic resistance generated by the airflow and the injection pipe 12, enhancing the fuel mixing effect, avoiding the risk of damage to the support plate body 1 structure due to local overheating, and extending the service life of the support plate injector.

[0029] Specifically, in this embodiment, the windward side of the injection pipe 12 near the upstream direction of the airflow is arc-shaped, and the leeward side of the injection pipe 12 near the downstream direction of the airflow is square. This configuration allows the airflow to flow more smoothly through the injection pipe 12, reducing the scouring effect of the airflow on the windward side of the injection pipe 12 and improving the aerodynamic efficiency of the combustion chamber 4. The square leeward side causes a sudden increase in the flow area after the airflow bypasses the windward side, forming a stable recirculation zone on the leeward side. This recirculation zone can entrain high-temperature combustion products, enhancing the turbulence effect of the airflow. This allows the airflow and fuel in the combustion chamber 4 to mix thoroughly. Simultaneously, the square leeward side provides better structural strength and rigidity, enabling it to withstand the pressure generated by the high-temperature, high-pressure gas in the combustion chamber 4. This ensures the stability of the support plate's shape and position during operation, preventing deformation or damage and extending the service life of the support plate body 1.

[0030] like Figures 1-3 As shown, specifically in this embodiment, the support plate injector further includes a reinforcing rib 13, which is disposed in the angle region between the mounting flange 11 and the injection pipe 12 near the leeward side of the downstream airflow. This arrangement allows the mounting flange 11 and the injection pipe 12 to maintain structural stability through the reinforcing rib 13 when the windward side of the injection pipe 12 is subjected to the impact force of the airflow during fuel injection into the combustion chamber 4, thus avoiding the risk of deformation and extending the service life of the support plate body 1.

[0031] like Figure 1 and Figure 2As shown, specifically in this embodiment, a sealing channel 14 is provided on the side of the mounting flange 11 near the oil inlet component 2, and the support plate injector also includes a sealing component disposed within the sealing channel 14. This arrangement prevents fuel leakage from the first channel 121 and the second channel 211 through the sealing component, and simultaneously avoids the risk of high-temperature, high-pressure gas inside the combustion chamber 4 leaking out through the gap between the mounting flange 11 and the connecting part 21. For example, the sealing component can be a graphite gasket, a rubber gasket, or other materials with sealing functions, as long as it ensures that fuel flowing in the first channel 121 and the second channel 211 within the support plate injector does not leak.

[0032] In other embodiments, a sealing channel 14 is also provided in the contact area between the connection portion 21 of the fuel inlet component 2 and the outer wall surface of the combustion chamber 4, and the fuel inlet component 2 and the combustion chamber 4 are sealed together by a sealing component. This arrangement can prevent fuel leakage from the gap at the connection between the first channel 121 and the second channel 211 by the sealing component.

[0033] like Figures 3-5 As shown, the present invention also provides a method for preparing a support plate, used to prepare a support plate body 1 of a support plate injector as described in any of the above claims, the method comprising: Step S100: A contour mold is provided based on the structure of the support plate body 1. Since the shape of the contour mold is exactly the same as the structure of the support plate body, it can provide a benchmark for the subsequent preparation process and avoid the risk of insufficient local structural strength of the support plate body due to uneven interlayer compaction and fiber direction deviation.

[0034] In step S200, carbon cloth 5 is laid layer by layer on the surface of the mold, and the multiple layers of carbon cloth 5 are needle-punched. The carbon cloth 5 is overlapped at the overlap position, and the overlap is stitched along the generatrix direction parallel to the extension direction of the first channel 121 to obtain the support plate base structure.

[0035] It should be noted that in step S200, needle punching is performed by treating the fiber cloth or composite pad material with needles, which carries some of the horizontal fibers in the fiber web to the Z direction, generating vertical fiber clusters. Relying on the force formed by the mutual entanglement between the fibers, a quasi-3D prefabricated body with certain strength in both the plane and the Z direction is formed, namely the support plate matrix structure.

[0036] In the composite material molding process, carbon cloth 5 is laid on the surface of the mold according to the three-dimensional geometry of the support plate body 1 through the needle punching and stitching molding process in step S200, so that the layup fits the shape of the mold perfectly.

[0037] like Figure 3As shown, for example, the end of the injection pipe 12 away from the mounting flange 11 has a complex structure with curved surfaces and corners, making it difficult to ensure uniform coverage compared to traditional planar layups. Therefore, a contour layup is used, adjusting the fiber direction and layup position sequentially to ensure that each layer of carbon cloth 5 tightly conforms to the three-dimensional contour of the contour mold, avoiding wrinkles, bubbles, or gaps. Specifically, at the end of the injection pipe 12 away from the mounting flange 11, a single piece of carbon cloth 5 can be fan-shaped or wedge-shaped, with multiple pieces of carbon cloth 5 laid up in a petal-like distribution along the circumferential direction. The circumferential edges of each piece of carbon cloth 5 overlap, and the overlapping areas are stitched together. This arrangement ensures the integrity of the carbon cloth 5 covering the surface of the contour mold during the layup process. The fan-shaped carbon cloth 5 can be distributed circumferentially in four, five, six, or eight layers, etc. The operator can select different layup numbers according to the actual structural strength requirements of the support plate body 1 to ensure the strength and toughness of the prepared support plate body 1 material. Specifically, the overlapping part is located on the leeward side of the injection pipe 12 corresponding to the support plate body 1 in the molding die. During the operation of the support plate body 1, the windward side of the injection pipe 12 directly bears the scouring and friction of the airflow in the combustion chamber 4, while the leeward side of the injection pipe 12 is subjected to less scouring by the airflow. The stress on the overlapping part is more stable, reducing the risk of wear and fatigue damage at the overlapping part, and extending the sealing performance of the joint and the overall service life of the support plate body 1.

[0038] Step S300: The support plate substrate structure is densified by reactive melt infiltration to obtain the support plate preform.

[0039] For example, the densification treatment of the support plate matrix structure can also be carried out by hot pressing sintering, hot isostatic pressing or other densification treatment methods, as long as the porosity of the support plate matrix structure surface is reduced and the fuel permeability is reduced.

[0040] In step S400, a composite coating is applied to the surface of the support plate preform using a chemical vapor deposition process to obtain the support plate body 1.

[0041] Compared to traditional support plates made of ceramic matrix composites, which often suffer from leakage issues due to internal pores, poor interfacial bonding, or microcracks formed during manufacturing, this application uses a needle-punching and stitching molding process to obtain the support plate matrix structure. This matrix structure is then densified and coated with a composite coating. This allows the resulting support plate body 1 to operate within the combustion chamber 4, directly impacted by airflow and under high pressure. The appropriate carbon fiber orientation, the needle-punching and stitching support plate preform reinforcement method, the prepared composite material, and the composite coating ensure the structural strength of the support plate body 1, thereby reducing fuel leakage and improving its oxidation resistance, ablation resistance, and erosion resistance.

[0042] Specifically, in step S200, the overlapping portion is sewn along the generatrix direction parallel to the extension direction of the first channel 121 using a sewing process, including: In step S200', the overlapping area is stitched together along the generatrix direction parallel to the extension direction of the first channel 121 using a stitching process with 6K or 12K carbon fiber. 6K carbon fiber has good fiber bundle flexibility and low threading resistance during stitching, allowing for more uniform fiber arrangement on complex curved surfaces (such as corners and areas of varying thickness) at the overlapping area, avoiding localized stress concentration caused by excessively thick fiber bundles and reducing the material fatigue life of the support plate substrate structure. 12K carbon fiber has good rigidity and bundle cohesion, avoiding the risk of buckling or deformation of the stitched support plate substrate structure due to external impact or vibration. Operators can choose different carbon fibers according to actual work requirements, as long as the stitched support plate substrate structure can operate normally under the high temperature and high pressure environment within the combustion chamber 4.

[0043] Specifically, the densification treatment of the support plate substrate by reactive melt infiltration in step S400 includes: Step S401: Impregnate the support plate substrate with a polycarbohafnium solution until the density reaches 1.8 kg / cm³. 3 ; Step S402: The support plate substrate is densified by cyclic impregnation with polycarbosilane solution to obtain the support plate preform.

[0044] The above steps complete the densification treatment of the support plate substrate. During multiple impregnation processes, the solution continuously fills the gaps at the fiber / matrix interface and the coating / matrix interface, reducing stress concentration at the interface, enhancing the overall material integrity, and gradually reducing or eliminating defects such as pores and cracks within the support plate substrate structure. This improves the density of the obtained support plate preform, optimizes its strength, toughness, oxidation resistance, and reduces its permeability. For example, the number of cyclic impregnations with the polycarbosilane solution can be 2, 4, 5, or 8 times, as long as the final support plate preform is densified.

[0045] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A plate-mounted injection device, characterized in that, include: The support plate body has a connected mounting flange and an injection pipe. A first channel is provided through the interior of the mounting flange and the injection pipe. Multiple injection holes are opened on the side wall of the first channel near the injection pipe. The multiple injection holes are arranged at intervals along the extension direction of the first channel. The mounting flange and the injection pipe are inclined relative to each other. The support plate body is used to inject fuel into the combustion chamber through the injection holes. The oil inlet component has a connecting part and an oil inlet part connected together. A second channel is provided through the interior of the connecting part and the oil inlet part. The second channel is connected to the first channel and is used to connect to a fuel supply source. Fastening components are used to secure the support plate body and the oil inlet component by passing through the connection and the outer wall of the combustion chamber.

2. The support plate injection device according to claim 1, characterized in that, The support plate body includes a support plate preform and a composite coating covering the surface of the support plate preform. The material of the support plate preform is C / C-SiC ceramic matrix composite material or SiCf / SiC ceramic matrix composite material.

3. The support plate injection device according to claim 2, characterized in that, The composite coating includes a SiC-HfC-SiC composite coating or a ZrC-SiC-ZrC composite coating.

4. The support plate injection device according to claim 1, characterized in that, The angle between the mounting flange and the windward side of the injection pipe near the upstream direction of the airflow is 40° to 50°.

5. The support plate injection device according to claim 1, characterized in that, The windward side of the injection pipe near the upstream direction of the airflow is arc-shaped, while the leeward side of the injection pipe near the downstream direction of the airflow is square.

6. The support plate injection device according to claim 1, characterized in that, It also includes reinforcing ribs, which are disposed in the angle region between the mounting flange and the leeward side of the injection pipe in the downstream direction of the airflow.

7. The support plate injection device according to claim 1, characterized in that, The mounting flange has a sealing groove on the side near the oil inlet component, and the support plate injector also includes a sealing component, which is disposed in the sealing groove.

8. A method for preparing a support plate, used to prepare the support plate body of the support plate injector as described in any one of claims 1 to 7, characterized in that, The method includes: A contour mold is provided based on the structure of the support plate body; Carbon cloth is laid layer by layer on the surface of the mold, and the multiple layers of carbon cloth are needle-punched. The carbon cloth is overlapped at the overlap position, and the overlap is stitched along the generatrix direction parallel to the extension direction of the first channel to obtain the support plate matrix structure. The support plate matrix structure is densified by reactive melt infiltration to obtain a support plate preform. The support plate body is obtained by applying a composite coating to the surface of the support plate preform using a chemical vapor deposition process.

9. The method for preparing the support plate according to claim 8, characterized in that, The overlapping portion is stitched along the generatrix direction parallel to the extension direction of the first channel using a stitching process, including: the overlapping portion is stitched along the generatrix direction parallel to the extension direction of the first channel using a needle punching and stitching process with 6K carbon fiber or 12K carbon fiber.

10. The method for preparing the support plate according to claim 8, characterized in that, The densification treatment of the support plate matrix by reactive melt infiltration includes: The support plate substrate was impregnated with a polycarbohafranco solution until the density reached 1.8 kg / cm³. 3 The support plate substrate is densified by cyclic impregnation with a polycarbosilane solution to obtain the support plate preform.

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