A steam generator injection device and engine ground test system

Abstract

The present application relates to the technical field of steam generator, and discloses a steam generator injection device and an engine ground test system.The steam generator injection device comprises: an injection base, which is internally provided with a fuel large collecting cavity, the fuel large collecting cavity is communicated with a fuel inlet, and the injection base is provided with a fuel injection hole and an oxidant injection hole on one side thereof; and a top cover, which is fixedly installed on one side of the injection base, the fuel injection hole and the oxidant injection hole are respectively arranged on the opposite sides of the injection base, and the top cover and the injection base are surrounded to form an oxidant large collecting cavity, the oxidant large collecting cavity is communicated with the oxidant injection hole.Through the arrangement of the oxidant large collecting cavity and the fuel large collecting cavity and the synchronous injection of the array type injection holes with parallel outlets, the mixture of the oxidant and the fuel can be effectively prevented from being ignited before being injected from the respective injection holes, and the occurrence of the injector ablation failure caused by the oxidant and fuel weld cracking and cavity stringing can be avoided at the source.

Description

Technical Field

[0001] This invention relates to the field of steam generator technology, specifically to a steam generator injection device and an engine ground test system. Background Technology

[0002] As the core power source of modern aerospace technology, ground-based high-altitude simulation tests, as an important means of verifying the performance of aerospace engines, have become an indispensable part of the aerospace engine development process. By simulating combustion, exhaust, and other operating conditions in high-altitude environments, ground-based high-altitude simulation tests can effectively evaluate the performance and reliability of aerospace engines under actual flight conditions.

[0003] During ground-based high-altitude simulated test firings of aerospace engines, the combustion gases produced need to be expelled via steam ejection to ensure the test environment optimally replicates the actual operating conditions. With increasingly demanding test scenarios, to guarantee the realism and reliability of the tests, current ground-based high-altitude simulated test firings of aerospace engines require steam temperatures exceeding 300℃, chamber pressures exceeding 1.8MPa, and mass flow rates exceeding 350kg / s.

[0004] In existing technologies, the injection surface of steam generator injectors will undergo localized ablation due to prolonged exposure to high temperature and pressure under high chamber pressure conditions. This leads to structural damage and performance degradation of the injector, resulting in a decrease in steam injection efficiency. It is difficult to guarantee the reliability of the injector during long-term continuous operation, which affects the accuracy of the results of the entire aerospace engine ground test. Summary of the Invention

[0005] In view of this, the present invention provides a steam generator injection device and an engine ground test system to solve the problem that the steam generator injector is easily ablated and damaged during the ground high-altitude simulation test of aerospace engines, which affects the accuracy of the test results.

[0006] In a first aspect, the present invention provides a steam generator injection device, comprising:

[0007] The injection base has a fuel collection chamber inside, which is continuously arranged along the circumference of the injection base and is connected to the fuel inlet. Multiple fuel injection holes and multiple oxidant injection holes are arranged in an array on one side of the injection base. All fuel injection holes are connected to the fuel collection chamber and are parallel to the outlet of the oxidant injection holes.

[0008] A top cover is fixedly installed on one side of the injection base. The top cover and the fuel injection hole are respectively located on opposite sides of the injection base. The top cover and the injection base enclose a large oxidant collection chamber, which is connected to the oxidant injection hole. An oxidant inlet is provided on the top cover.

[0009] The steam generator injection device is used in the engine ground test system to generate ejector steam during high-altitude simulated engine tests. This ejector steam is then used to expel the combustion gases produced by the engine. The steam generator injection device injects fuel and oxidizer into the combustion chamber, where they are ignited by an igniter. The mixture then mixes with water to produce high-temperature steam with stable pressure and flow rate. In this embodiment, liquid alcohol is used as the fuel, and liquid oxygen is used as the oxidizer. During operation, the oxidizer enters the large oxidizer collection chamber formed by the top cover and the injection base through the oxidizer inlet on the top cover, and is then ejected through an array of oxidizer injection holes. Simultaneously, fuel enters the large fuel collection chamber continuously arranged circumferentially along the injection base through the fuel inlet, and is ejected through multiple fuel injection holes connected to it. All fuel injection holes and oxidizer injection holes are parallel to each other in their outlet direction, ensuring that the two working fluids mix in the combustion chamber after ejection and are ignited to produce high-temperature combustion gases. By integrating the oxidizer and fuel collection chambers into the large oxidizer collection chamber formed by the top cover and the injection base, and the large fuel collection chamber within the circumferential cavity of the injection base, respectively, and using an array of parallel injection holes for synchronous ejection, it is possible to effectively prevent the oxidizer and fuel from mixing and igniting before being ejected from their respective injection holes. This avoids the occurrence of injector ablation and other failures caused by weld cracking and cross-contamination of oxidizer and fuel, thereby improving the reliability and service life of the injection device under high temperature and high chamber pressure conditions and ensuring the accuracy of the results of aerospace engine ground tests.

[0010] In one optional embodiment, the injection base is provided with a plurality of small fuel collection chambers, each of which is connected to the large fuel collection chamber, and the inlet end of the fuel injection hole is connected to the small fuel collection chamber.

[0011] Fuel is first distributed from the large fuel collection chamber to multiple interconnected small fuel collection chambers, and then injected through fuel injection holes connected to the small collection chambers. This staged distribution method enables the fuel to be more evenly distributed before injection, effectively reducing the flow deviation between fuel injection holes, thereby promoting more uniform mixing and combustion of fuel and oxidizer in the combustion chamber.

[0012] In one alternative embodiment, the plurality of fuel collection chambers are arranged in parallel to each other.

[0013] The parallel arrangement of multiple fuel collection chambers within the injection base reduces the complexity of fluid distribution, simplifies the processing, and ensures that fuel is delivered to each fuel collection chamber at a uniform pressure and flow rate, and then ejected from the fuel collection chamber through the fuel injection hole, further improving the uniformity and consistency of fuel injection.

[0014] In one optional embodiment, the injection base is provided with a plurality of small oxidant collection chambers, each of which is connected to the large oxidant collection chamber, and the inlet end of the oxidant injection hole is connected to the small oxidant collection chamber.

[0015] The oxidant enters the large oxidant collection chamber through the oxidant inlet on the top cover, and is then diverted into multiple small oxidant collection chambers. Finally, it is ejected through oxidant injection holes that communicate with the small collection chambers. By molding the small oxidant collection chambers and fuel collection chambers together within the injection base in an integrated manner, the design avoids injector erosion and other failures caused by weld cracking and cross-contamination of oxidant and fuel, thus improving the structural reliability of the product.

[0016] In one optional embodiment, the fuel collection chamber and the oxidizer collection chamber are arranged alternately. This ensures that the fuel jets and oxidizer jets ejected from them are spatially close to each other, shortening the mixing distance between the two working fluids. The fuel jets and oxidizer jets ejected from the fuel injection hole and oxidizer injection hole, respectively, can quickly form a uniformly mixed combustible mixture, improving combustion efficiency and stability.

[0017] In one alternative embodiment, the injection base is circumferentially mounted with a fuel input disc, and the fuel inlets extend radially through the fuel input disc, with multiple fuel inlets spaced circumferentially along the fuel input disc.

[0018] Fuel enters the large fuel collection chamber within the injection base through multiple radially arranged fuel inlets spaced circumferentially on the fuel input disc. This multi-inlet, circumferentially symmetrical feeding reduces fuel flow unevenness within the large fuel collection chamber, ensuring balanced fuel pressure across all circumferential regions, thus providing a stable and consistent fuel supply to all fuel injection orifices.

[0019] In one optional embodiment, the injection base is provided with a cooling hole, one end of which is connected to the fuel large liquid collection chamber, and the other end penetrates one side of the injection base. The cooling hole and the fuel injection hole are located on the same side of the injection base, and the cooling hole and the fuel injection hole are arranged at an angle to each other.

[0020] Part of the fuel is diverted from the fuel collection chamber to the cooling holes, which spray the fuel into the combustion chamber at a certain angle. This achieves active cooling and protection of the injection base using liquid fuel, preventing the injection base from being ablated by high-temperature gas backflow or radiation.

[0021] In one optional embodiment, multiple cooling holes are spaced circumferentially along the injection base. The fuel injection holes are perpendicular to the injection base, while the cooling holes are angled towards it, with their outlets inclined away from the fuel injection holes. These cooling holes surround the fuel and oxidizer injection holes. The multiple cooling holes, spaced along the periphery of the injection base and with their outlets inclined away from the central injection hole area, form a cooling barrier around the array of fuel and oxidizer injection holes. This cooling barrier not only cools the injection base panel but also effectively blows away the high-temperature combustion gases using the outwardly inclined fuel jet, preventing the flame from approaching the injection surface. The injection surface of the injection base receives reliable cooling and isolation protection.

[0022] In one optional embodiment, the injection base and the fuel input disc are integrally formed. The injection base and fuel input disc are manufactured as a single component using an integral molding process, thereby eliminating any possible connecting welds and sealing interfaces between them. This fundamentally avoids fuel leakage due to premature mixing of fuel and oxidant caused by weld cracking or seal failure, leading to erosion of the injection base's inner cavity and improving the structural integrity and long-term operational reliability of the entire injection device.

[0023] In one optional embodiment, an oxidant pipeline is installed on the top cover, and the oxidant inlet is located within the oxidant pipeline. The oxidant is introduced through the oxidant pipeline on the top cover, which provides a stable working fluid input channel, facilitating optimized flow of the oxidant into the large oxidant collection chamber and ensuring a stable oxidant supply.

[0024] In one optional embodiment, an oxidant baffle is fixedly installed inside the large oxidant collection chamber, the baffle facing the outlet of the oxidant pipeline, and the baffle has oxidant through holes. An oxidant baffle with through holes is installed inside the large oxidant collection chamber directly opposite the outlet of the oxidant pipeline. The oxidant baffle effectively blocks and buffers the high-speed working fluid flow from the oxidant pipeline, reducing the oxidant velocity and allowing it to diffuse evenly throughout the large oxidant collection chamber through the through holes. This prevents erosion caused by the high-speed oxidant fluid directly impacting the distal wall of the chamber and avoids uneven oxidant pressure distribution within the multiple small oxidant collection chambers.

[0025] Secondly, the present invention also provides an engine ground test system having the steam generator injection device described in the present invention.

[0026] Since the engine ground test system includes a steam generator injection device, which has the same effect as the steam generator injection device, it will not be described in detail here. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the internal structure of the steam generator injection device provided in an embodiment of the present invention.

[0029] Figure 2 This is a bottom view of the steam generator injection device provided in an embodiment of the present invention. Figure 2 Only one fuel inlet is shown.

[0030] Figure 3 This is a schematic diagram of the structure of the oxidant separator provided in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Injection base; 2. Top cover; 3. Fuel input disc; 4. Oxidant pipeline; 5. Fuel inlet; 6. Oxidant inlet; 7. Large fuel collection chamber; 8. Large oxidant collection chamber; 9. Small fuel collection chamber; 10. Small oxidant collection chamber; 11. Fuel injection hole; 12. Oxidant injection hole; 13. Cooling hole; 14. Oxidant baffle; 15. Oxidant through hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, a steam generator injection device is provided, including an injection base 1 and a top cover 2.

[0035] The injection base 1 has a fuel collection chamber 7 inside, which is continuously arranged along the circumference of the injection base 1 and is connected to the fuel inlet 5. Multiple fuel injection holes 11 and multiple oxidant injection holes 12 are arranged in an array on one side of the injection base 1. All fuel injection holes 11 are connected to the fuel collection chamber 7, and their outlets are parallel to those of the oxidant injection holes. A top cover 2 is fixedly installed on one side of the injection base 1. The top cover 2 and the fuel injection holes 11 are respectively located on opposite sides of the injection base 1. The top cover 2 and the injection base 1 enclose a large oxidant collection chamber 8, which is connected to the oxidant injection holes 12. An oxidant inlet 6 is provided on the top cover 2.

[0036] The steam generator injection system is used in engine ground test systems to generate ejector steam during high-altitude simulated engine tests. This ejector steam is then used to expel the combustion gases produced by the engine. After injecting fuel and oxidizer into the combustion chamber, they are ignited by an igniter and then mixed with water to produce high-temperature steam with stable pressure and flow rate. In this embodiment, liquid alcohol is used as the fuel, and liquid oxygen is used as the oxidizer.

[0037] When the steam generator injection device is working, the oxidant enters the oxidant large liquid collection chamber 8 formed by the top cover 2 and the injection base 1 through the oxidant inlet 6 on the top cover 2, and is then sprayed out through the array of oxidant injection holes 12; at the same time, the fuel enters the fuel large liquid collection chamber 7 continuously arranged around the injection base 1 through the fuel inlet 5, and is sprayed out through multiple fuel injection holes 11 connected to it; all the fuel injection holes 11 and the oxidant injection holes 12 are parallel to each other in the outlet direction, so that the two working fluids can be mixed in the combustion chamber after being sprayed out and then ignited to produce high-temperature gas.

[0038] By integrating the oxidizer and fuel collection chambers into the oxidizer large collection chamber 8 formed by the top cover 2 and the injection base 1, and the fuel large collection chamber 7 in the circumferential cavity of the injection base 1, and using parallel array-type injection holes for synchronous injection, it is possible to effectively prevent the oxidizer and fuel from mixing and igniting before being ejected from their respective injection holes. This avoids the occurrence of malfunctions such as injector ablation caused by cracking of the oxidizer and fuel welds and cross-contamination of the cavity. It also improves the reliability and service life of the injection device under high temperature and high chamber pressure conditions, and ensures the accuracy of the results of aerospace engine ground tests.

[0039] In one embodiment, the injection base 1 has multiple small fuel collection chambers 9 formed inside. Each small fuel collection chamber 9 is in communication with a large fuel collection chamber 7 that is continuously arranged around the circumference of the injection base 1, and the inlet end of each fuel injection hole 11 is connected to a corresponding small fuel collection chamber 9. Multiple fuel injection holes 11 are connected to each small fuel collection chamber 9. The small fuel collection chambers 9 can preferably adopt a cylindrical, rectangular, or other regular geometric shape. Multiple small fuel collection chambers 9 can be arranged in parallel to each other, or they can adopt other regular layouts such as ring or matrix according to the flow distribution requirements.

[0040] Fuel is first distributed from the large fuel collection chamber 7 to the multiple small fuel collection chambers 9, and then injected outward through fuel injection holes 11 that communicate with each small collection chamber. This staged distribution structure can improve the uniformity of fuel distribution before injection, reduce the flow deviation between each fuel injection hole 11, thereby promoting more complete and uniform mixing and combustion of fuel and oxidant in the combustion chamber, and improving combustion efficiency.

[0041] In this embodiment, the fuel collection chamber 9 is selected as a cylindrical chamber, and multiple fuel collection chambers 9 are arranged in parallel to each other. The parallel layout of multiple fuel collection chambers 9 within the injection base 1 reduces the complexity of fluid distribution, simplifies the processing technology, and ensures that fuel can be delivered to each fuel collection chamber 9 with uniform pressure and flow rate, and then ejected from the fuel collection chamber 9 through the fuel injection hole 11, further improving the uniformity and consistency of fuel injection.

[0042] In one embodiment, the injection base 1 is further provided with a plurality of small oxidant collection chambers 10. Each small oxidant collection chamber 10 is connected to a large oxidant collection chamber 8 formed by the top cover 2 and the injection base 1, and the inlet end of each oxidant injection hole 12 is connected to a corresponding small oxidant collection chamber 10. Each small oxidant collection chamber 10 is connected to two rows of multiple oxidant injection holes 12.

[0043] The oxidizer first enters the large oxidizer collection chamber 8 from the oxidizer inlet 6 on the top cover 2, and is then diverted to the small oxidizer collection chambers 10, finally being injected into the combustion chamber through the oxidizer injection hole 12. By integrally molding the small oxidizer collection chambers 10 and the small fuel collection chambers 9 within the same injection base 1 component, the weld seams caused by welding chambers of different materials in traditional designs can be completely eliminated from the structural design. This fundamentally avoids the risk of oxidizer and fuel mixing due to weld cracking, which could lead to premature combustion and injector erosion, thus improving the overall structural reliability and service life of the injection device.

[0044] In this embodiment, the fuel collection chamber 9 is a rectangular trough-shaped chamber structure. Multiple fuel collection chambers 9 and oxidizer collection chambers 10 are arranged alternately adjacent to each other within the injection base 1. This ensures that the fuel jets and oxidizer jets ejected from their respective injection holes are immediately spatially adjacent after leaving the injection surface, shortening the distance required for the two working fluids to diffuse and mix. This allows for the rapid formation of a uniformly mixed combustible mixture, significantly improving the combustion efficiency, flame stability, and temperature field uniformity of the combustion chamber.

[0045] In one embodiment, an annular fuel inlet disk 3 is mounted on the circumferential outer side of the injection base 1. Multiple radially extending fuel inlet channels 5 are spaced apart along the circumferential direction on the fuel inlet disk 3. Fuel enters the annular fuel collection chamber 7 inside the injection base 1 through the circumferentially distributed fuel inlets 5. This multi-inlet, circumferentially symmetrical feeding method improves the uniformity of fuel flow distribution within the annular collection chamber, avoids the generation of local flow dead zones or high-speed zones, and ensures that the fuel pressure obtained by each area of ​​the injection base 1 remains highly balanced. This provides a stable and consistent fuel supply with consistent flow and pressure to all fuel injection holes 11, ensuring the symmetry and stability of combustion.

[0046] To facilitate installation and integration with other structures, multiple flange holes are spaced apart circumferentially on the annular fuel input disc 3, with the fuel inlet 5 positioned between adjacent flange holes. Figure 2 In the diagram, only one fuel inlet 5 is shown. In actual applications, one fuel inlet 5 can be set between each pair of adjacent flange holes, or the arrangement can be made according to the design.

[0047] In one embodiment, the injection base 1 is provided with a cooling hole 13. One end of the cooling hole 13 is connected to the fuel collection chamber 7, and the other end extends obliquely through to the side surface of the injection base facing the combustion chamber. The cooling hole 13 and the fuel injection hole 11 are located on the same surface of the injection base 1, and their axes are arranged at a certain angle, for example, between 15° and 75°. Part of the fuel is diverted from the fuel collection chamber 7 into the cooling hole 13 and sprayed at a certain angle onto the surface of the injection base 1 or the combustion chamber space. This low-temperature fuel jet can actively cool the surface of the injection base 1, achieving active thermal protection for the injection base 1 and effectively preventing overheating, ablation, or deformation of the injection surface material caused by high-temperature combustion gas backflow or strong thermal radiation.

[0048] Specifically, multiple cooling holes 13 are spaced apart along the circumferential edge region of the injection base 1. The axis of the fuel injection hole 11 is perpendicular to the surface of the injection base 1, while the axis of the cooling hole 13 forms an acute angle with the surface of the injection base 1, and the outlet direction of the cooling hole 13 is inclined away from the concentrated area of ​​the fuel injection hole 11 and the oxidizer injection hole 12. The circumferentially arranged cooling holes 13 together form a continuous cooling barrier around the concentrated area of ​​the fuel injection hole 11 and the oxidizer injection hole 12. The cooling barrier directly cools the injection base 1 panel by absorbing heat from fuel evaporation, and at the same time uses its outwardly inclined jet flow to purge the high-temperature combustion gas attached to the injection surface, effectively preventing the flame from approaching and stabilizing the injection surface, providing a cold source guarantee for stable combustion in the concentrated area of ​​the fuel injection hole 11 and the oxidizer injection hole 12 and for long-term thermal protection of the injection surface.

[0049] In this embodiment, the injection base 1 and the fuel input disk 3 are manufactured using an integral molding process to form a single integral component, thereby eliminating the possible connection welds and sealing interfaces between the two. This fundamentally avoids the burning of the inner cavity of the injection base 1 caused by fuel leakage due to premature mixing of fuel and oxidant caused by weld cracking or sealing failure, thus improving the structural integrity and long-term operational reliability of the entire injection device.

[0050] In one embodiment, an oxidant pipeline 4 is installed on the top cover 2, and an oxidant inlet 6 is located inside the oxidant pipeline 4. The oxidant is introduced through the oxidant pipeline 4 on the top cover 2, which provides a stable working fluid input channel, which helps to optimize the flow of the oxidant into the oxidant collection chamber 8 and ensures a stable oxidant supply.

[0051] In one embodiment, an oxidant baffle 14 is fixedly installed inside the large oxidant collection chamber 8, facing the outlet of the oxidant pipeline 4. The oxidant baffle 14 has multiple uniformly distributed oxidant through holes 15. An oxidant baffle 14 with through holes is installed inside the large oxidant collection chamber 8 directly opposite the outlet of the oxidant pipeline 4. The oxidant baffle 14 effectively blocks and buffers the high-speed working fluid flow from the oxidant pipeline 4, reducing the oxidant velocity and allowing it to diffuse evenly throughout the large oxidant collection chamber 8 through the through holes. This prevents erosion caused by the high-speed oxidant fluid directly impacting the distal wall of the chamber and avoids uneven oxidant pressure distribution within the multiple small oxidant collection chambers 10.

[0052] Furthermore, in order to prevent the oxidant from accumulating in the dead corners of the large oxidant collection chamber 8, which would prevent some of the oxidant from flowing into the small oxidant collection chamber 10, a flow guide groove is provided on the side of the injection base 1 facing the large oxidant collection chamber 8. The flow guide groove covers at least the inlet ends of all the small oxidant collection chambers 10, and the corners of the flow guide groove are rounded.

[0053] The steam generator injection device provided in this embodiment is a highly reliable checkerboard-style three-impact injector, which includes an integrated injection base 1 and fuel input plate 3, a hemispherical oxidant top cover 2 and oxidant baffle 14, and vertically designed oxidant injection holes 12 and fuel injection holes 11. The top cover 2 is located on top of the injection base 1, and together with the injection base 1, it forms a large oxidant collection chamber 8. At the same time, the oxidant baffle 14 reduces the impact velocity of the oxidant. The oxidant injection holes 12 enter the combustion chamber vertically, mix with the fuel in the combustion chamber, and are ignited by an igniter set on the side of the combustion chamber to generate high-temperature combustion gas.

[0054] The top cover 2 has an oxidant working fluid inlet, which is connected to the large oxidant collection chamber 8. The injection base 1 has a small oxidant collection chamber 10, which is connected to the large collection chamber. The injection base 1 also has a fuel working fluid inlet, which is connected to the large fuel collection chamber 7. The injection base 1 has a small fuel collection chamber 9, which is connected to the large collection chamber. The injection base 1 has a checkerboard-style arrangement of oxidant injection holes 12 and fuel injection holes 11. The oxidant inlet 6 is connected to the large oxidant collection chamber 8, and the large oxidant collection chamber 8 is connected to the small oxidant collection chamber 10. The outlet of the small oxidant collection chamber 10 is designed as the oxidant injection hole 12. The fuel inlet 5 is connected to the large fuel collection chamber 7, and the large fuel collection chamber 7 is connected to the small fuel collection chamber 9. The outlet of the small fuel collection chamber 9 is provided with the fuel injection hole 11. The axis of the oxidizer injection holes 12 is perpendicular to the bottom surface of the injection base 1, and the axis of the fuel injection holes 11 is also perpendicular to the bottom surface of the injection base 1. The oxidizer injection holes 12 are arranged in a pattern of one row corresponding to two rows of fuel injection holes 11. A set of cooling holes 13 are provided around the injection base 1 to inject cooler fuel outwards, protecting the injection base 1 from ablation during the test. Both the oxidizer injection holes 12 and the fuel injection holes 11 are arranged in a checkerboard pattern, with smaller fuel injection holes 11 arranged on the outermost ring of the injection base 1 for cooling. The oxidizer injection holes 12 and the fuel injection holes 11 are evenly distributed on the checkerboard pattern.

[0055] The axis of the oxidizer inlet 6 is perpendicular to the top plane of the injection base 1, and the axis of the fuel inlet 5 is parallel to the top plane of the injection base 1. The hemispherical top cover 2, the injection base 1, and the oxidizer pipeline 4 are all welded together by fusion welding. In this embodiment, the oxidizer is liquid oxygen, and the fuel is alcohol.

[0056] This embodiment presents a highly reliable checkerboard-style three-impact injector design. The oxidizer collection chamber 10 and the fuel collection chamber 9 are integrated into a single unit, preventing injector erosion and other failures caused by weld cracking and cross-contamination of the oxidizer and fuel from the design stage, thus improving the product's structural reliability. Furthermore, the injector employs a vertical injection method during operation, mixing and burning at a location far from the injection surface, while simultaneously utilizing fuel edge cooling. This combination significantly reduces the probability of injection surface failure and effectively protects the burner injector under high-temperature and high-pressure operating conditions, improving the overall reliability of the test system.

[0057] According to an embodiment of the present invention, another aspect provides an engine ground test system having the steam generator injection device described in this invention. The engine is an aircraft engine or a space engine. The outlets of the fuel injection port 11 and the oxidizer injection port of the steam generator injection device are both arranged facing the combustion chamber. The oxidizer and fuel respectively enter their respective collection chambers through the oxidizer inlet 6 pipe provided on the top cover 2 and the fuel inlet 5 flange provided on the flange, and then enter the combustion chamber through the injection ports arranged in the injector, where a high-temperature combustion gas is generated using an igniter. By integrating the oxidizer and fuel collection chambers into the oxidizer large collection chamber 8 formed by the top cover 2 and the injection base 1, and the fuel large collection chamber 7 in the circumferential cavity of the injection base 1, and using parallel array-type injection holes for synchronous injection, it is possible to effectively prevent the oxidizer and fuel from mixing and igniting before being ejected from their respective injection holes. This avoids the occurrence of malfunctions such as injector ablation caused by cracking of the oxidizer and fuel welds and cross-contamination of the cavity. It also improves the reliability and service life of the injection device under high temperature and high chamber pressure conditions, and ensures the accuracy of the results of aerospace engine ground tests.

[0058] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A steam generator injection device, characterized in that, include: The injection base (1) has a fuel collection chamber (7) inside. The fuel collection chamber (7) is continuously arranged along the circumference of the injection base (1). The fuel collection chamber (7) is connected to the fuel inlet (5). Multiple fuel injection holes (11) and multiple oxidant injection holes (12) are arranged in an array on one side of the injection base (1). The fuel injection holes (11) are all connected to the fuel collection chamber (7). The outlets of the fuel injection holes (11) and the oxidant injection holes (12) are parallel. The top cover (2) is fixedly installed on one side of the injection base (1). The top cover (2) and the fuel injection hole (11) are respectively located on opposite sides of the injection base (1). The top cover (2) and the injection base (1) enclose to form an oxidant large liquid collection chamber (8). The oxidant large liquid collection chamber (8) is connected to the oxidant injection hole (12). An oxidant inlet (6) is provided on the top cover (2).

2. The steam generator jet device according to claim 1, wherein The injection base (1) is provided with a plurality of small fuel collection chambers (9), all of which are connected to the large fuel collection chamber (7), and the inlet end of the fuel injection hole (11) is connected to the small fuel collection chambers (9).

3. The steam generator jet device according to claim 2, wherein The multiple fuel collection chambers (9) are arranged in parallel to each other.

4. The steam generator jet of claim 2, wherein The injection base (1) is provided with multiple small oxidant collection chambers (10), each of which is connected to the large oxidant collection chamber (8). The inlet end of the oxidant injection hole (12) is connected to the small oxidant collection chamber (10).

5. The steam generator jet device according to claim 4, wherein The fuel collection chamber (9) and the oxidant collection chamber (10) are arranged alternately.

6. The steam generator jet device according to any one of claims 1 to 5, characterized in that The injection base (1) is circumferentially equipped with a fuel input disk (3), and the fuel inlet (5) penetrates the fuel input disk (3) radially. Multiple fuel inlets (5) are arranged at circumferential intervals along the fuel input disk (3).

7. The steam generator jet device according to any one of claims 1 to 5, characterized in that The injection base (1) is provided with a cooling hole (13). One end of the cooling hole (13) is connected to the fuel large liquid collection chamber (7), and the other end penetrates one side of the injection base (1). The cooling hole (13) and the fuel injection hole (11) are located on the same side of the injection base (1), and the cooling hole (13) and the fuel injection hole (11) are arranged at an angle.

8. The steam generator jet device according to any one of claims 1 to 5, characterized in that An oxidant pipeline (4) is installed on the top cover (2), and the oxidant inlet (6) is located inside the oxidant pipeline (4).

9. The steam generator jet device according to claim 8, wherein An oxidant baffle (14) is fixedly installed inside the oxidant collection chamber (8). The oxidant baffle (14) is positioned facing the outlet of the oxidant pipeline (4). An oxidant through hole (15) is provided on the oxidant baffle (14).

10. An engine ground test system characterized by, It has a steam generator injection device as described in any one of claims 1 to 9.

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