A windmill-driven oil pump high-speed combustion engine

Abstract

The application discloses a high-speed combustion engine driven by a windmill, comprising a pipe body, a combustion stabilizing structure, an oil pump and a windmill, a pipe cavity of the pipe body is used for receiving high-speed airflow and emitting burned gas, the combustion stabilizing structure is installed in the pipe cavity of the pipe body, the combustion stabilizing structure comprises a conical part and a supporting plate part, the conical part is provided with a fuel cavity, the fuel cavity is provided with a plurality of first fuel injection holes, the supporting plate part is connected between the conical part and the pipe body, the oil pump is arranged in the fuel cavity, the first fuel injection holes are located at a fuel output side of the oil pump, the windmill is arranged in the pipe cavity of the pipe body and is rotatably connected to a bottom end of the conical part through a rotary bearing, and the windmill can rotate under the action of the airflow in the pipe body and drive the oil pump to rotate. The high-speed combustion engine has the advantages that: on the one hand, the windmill is driven by the airflow to drive the oil pump, so that an external energy source is not needed, weight is reduced, and cost is lowered; on the other hand, the faster the airflow is, the more oil is supplied, combustion stability is ensured, and self-adaptive oil supply is realized.

Description

Technical Field

[0001] This invention relates to the field of high-speed combustion engine technology, and in particular to a high-speed combustion engine with a windmill-driven oil pump. Background Technology

[0002] The technological development of circular axisymmetric combustion chambers for high-speed combustion engines stems from the demand for stable combustion under wide operating conditions, low-resistance and high-efficiency thermal management and engineering in high-speed propulsion. The core is to solve the defects of boundary layer accumulation at the corners of two-dimensional rectangular combustion chambers, uneven heat load, and sharp performance drop at high Mach numbers. At the same time, it is adapted to the integrated design of high-speed propulsion systems. With its advantages of uniform circumferential heat load, strong resistance to back pressure, and easy structural integration, it has become the preferred solution in the field of high-speed propulsion.

[0003] In the combustion chamber of axisymmetric high-speed combustion engines, research on combustion stabilization structures has always revolved around the core contradiction of "difficulty in flame anchoring and high heat load under high-speed airflow": although traditional wall concave cavities can stabilize combustion by relying on the recirculation zone, the flame's proximity to the wall causes the heat flux density to exceed the material's tolerance limit. The introduction of the central cone has become the key to breaking the deadlock—it is integrated into the front end of the combustion chamber with a streamlined conical structure. The aerodynamic constraint of the cone can regulate the airflow inside the combustion chamber, reduce the mutual interference between shock waves and combustion heat release, and confine the high-temperature airflow to the center of the combustion chamber, thus stabilizing combustion while effectively reducing the heat load on the wall.

[0004] Currently, the mainstream methods for pumping fuel in axisymmetric high-speed combustion chambers include electric pumps, air turbine fuel pumps, and intake turbine-driven fuel pumps. Electric pumps generally use brushless DC motors or permanent magnet synchronous motors, which consume a lot of power and consume a large amount of onboard power. Air turbine and intake turbine-driven fuel pumps drive the turbine to rotate by drawing high-pressure airflow from an external gas cylinder or intake manifold, which in turn drives the fuel pump to output high-pressure fuel. The former requires an external gas cylinder, and the latter requires intake and exhaust channels, resulting in large weight and high cost. Summary of the Invention

[0005] Therefore, the present invention provides a high-speed combustion engine with a windmill-driven oil pump, which is lightweight and reduces costs.

[0006] To solve the above-mentioned technical problems, the present invention provides a high-speed combustion engine for a windmill-driven oil pump, comprising: The tube body, whose cavity is used to receive high-speed airflow and eject combustion gases; A combustion stabilization structure is installed inside the cavity of the pipe body. The combustion stabilization structure includes a conical part and a support plate part. The central axis of the conical part is coaxial with the central axis of the pipe body, and the apex of the conical part faces the air inlet of the pipe body. The conical part is provided with a fuel chamber for temporarily storing fuel. The fuel chamber is provided with a plurality of first fuel injection holes, which are evenly distributed around the central axis of the conical part on the outer side wall of the conical part for injecting fuel. The support plate part connects the conical part and the pipe body. An oil pump is located inside the fuel chamber. When the oil pump rotates, it can pump fuel into the fuel chamber. The first fuel injection hole is located on the fuel output side of the oil pump. A windmill is located inside the cavity of the pipe body and is rotatably connected to the bottom end of the conical part via a slewing bearing. The windmill can rotate under the action of airflow in the pipe body and drive the oil pump to rotate.

[0007] Optionally, the fuel chamber extends through the bottom surface of the conical portion, the drive shaft of the oil pump is connected to the rotating shaft of the windmill, and the drive shaft of the oil pump or the rotating shaft of the windmill is connected to the inner wall of the fuel chamber through the slewing bearing.

[0008] Optionally, the blades of the windmill are curved in an S-shape, with the angle of attack gradually decreasing from the blade root to the blade tip.

[0009] Optionally, the flame-stabilizing structure includes multiple support plates, which are evenly distributed around the conical portion and each extends radially along the conical portion.

[0010] Optionally, the pipe wall of the pipe body is provided with a first fuel input channel, at least a portion of the support plate is provided with a second fuel input channel, the fuel chamber is provided with a fuel inlet located on the fluid input side of the oil pump, the second fuel input channel connects the first fuel input channel and the fuel inlet of the fuel chamber, and the first fuel input channel and the second fuel input channel are used to transport fuel.

[0011] Optionally, the fuel chamber is provided with a fuel outlet located on the fluid output side of the oil pump, and at least a portion of the support plate is also provided with a first fuel output channel, and the pipe wall of the pipe body is also provided with a second fuel output channel. The first fuel output channel connects the fuel outlet of the fuel chamber and the second fuel output channel. The first fuel output channel and the second fuel output channel are used to transport fuel, and the second fuel output channel is provided with a second fuel nozzle for spraying fuel.

[0012] Optionally, the tube body includes an isolation section, an expansion section, and a combustion section connected sequentially along the airflow direction, and the combustion stabilization structure is located at one end of the expansion section near the combustion section.

[0013] Optionally, both the isolation section and the combustion section are cylindrical, and the inner diameter of the isolation section is smaller than that of the combustion section. The expansion section is frustum-shaped, and its inner diameter gradually increases along the airflow direction.

[0014] Optionally, the pipe body includes a first pipe section, a second pipe section, and a third pipe section connected sequentially along the airflow direction, wherein the inner cavity of the first pipe section is the isolation section, the inner cavity of the second pipe section is the expansion section, and the inner cavity of the third pipe section is the combustion section.

[0015] Optionally, the slewing bearing is a cylindrical roller bearing.

[0016] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The high-speed combustion engine of the windmill-driven oil pump in the present invention couples the oil pump, windmill and combustion stabilization structure together. The windmill rotates under the action of high-speed airflow, thereby driving the oil pump to rotate, playing the role of stabilizing combustion and supplying oil. On the one hand, the airflow drives the windmill to drive the oil pump, eliminating the need for external energy, reducing weight and lowering costs; on the other hand, the faster the airflow, the more oil is supplied, ensuring stable combustion and achieving adaptive oil supply. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a longitudinal cross-sectional schematic diagram of the high-speed combustion engine of the windmill-driven oil pump disclosed in this invention; Figure 2 This is a schematic diagram showing the connection between the tube body and the flame-stabilizing structure disclosed in this invention. Figure 3 This is a schematic diagram showing the connection of the oil pump, windmill, and rotary bearing disclosed in this invention.

[0019] The components include: 1. Pipe body; 11. First fuel input channel; 13. Isolation section; 14. Expansion section; 15. Combustion section; 16. First pipe section; 17. Second pipe section; 18. Third pipe section; 2. Flame stabilization structure; 21. Conical part; 22. Support plate part; 23. Fuel chamber; 231. First fuel nozzle; 24. Second fuel input channel; 3. Oil pump; 4. Windmill; 5. Rotary bearing. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] See Figures 1 to 3As shown, this invention discloses an embodiment of a high-speed combustion engine with a windmill-driven oil pump.

[0022] The high-speed combustion engine for the aforementioned windmill-driven oil pump includes: Pipe body 1, whose cavity is used to receive high-speed airflow and eject combustion gases; A combustion stabilization structure 2 is installed inside the cavity of the tube body 1. The combustion stabilization structure 2 includes a conical part 21 and a support plate part 22. The central axis of the conical part 21 is coaxial with the central axis of the tube body 1, and the apex of the conical part 21 faces the air inlet of the tube body 1. The conical part 21 is provided with a fuel chamber 23 for temporarily storing fuel. The fuel chamber 23 is provided with a plurality of first fuel injection holes 231. The plurality of first fuel injection holes 231 are evenly distributed around the central axis of the conical part 21 on the outer side wall of the conical part 21 for injecting fuel. The support plate part 22 is connected between the conical part 21 and the tube body 1. Oil pump 3 is located in the fuel chamber 23. When the oil pump 3 rotates, it can pump fuel into the fuel chamber 23. The first fuel injection hole 231 is located on the fuel output side of the oil pump 3. The windmill 4 is located inside the cavity of the pipe body 1 and is rotatably connected to the bottom end of the tapered part 21 via a slewing bearing 5. The windmill 4 can rotate under the action of the airflow in the pipe body 1 and drive the oil pump 3 to rotate.

[0023] Specifically, pipe body 1 serves as the main flow channel of the engine, used to receive high-speed airflow, supply fuel for combustion, and eject post-combustion gases. The combustion stabilization structure 2 consists of a conical section 21 and a support plate section 22, used for fixation, airflow guidance, and stabilization of the combustion zone. The conical section 21 is the core of the combustion stabilization structure, with its apex facing the air inlet. It contains a fuel chamber 23 that extends through the bottom surface, used to guide compressed airflow. The fuel chamber 23, located within the conical section 21, temporarily stores fuel, houses the oil pump 3, and provides space for fuel injection. First fuel injection holes 231 are evenly distributed on the outer wall of the conical section 21, used to atomize and eject the pressurized fuel from the fuel chamber 23. The support plate section 22 connects the conical section 21 to pipe body 1, fixing the combustion stabilization structure 2 and ensuring structural coaxiality and strength. The oil pump 3, located within the fuel chamber 23, has a drive shaft connected to the rotating shaft of the windmill 4, used to pressurize the fuel and deliver it to the injection holes. The windmill 4 is located inside the pipe body 1, at the bottom of the conical part 21, and outside the fuel chamber 23. It is driven to rotate by airflow to provide power to the oil pump 3. The rotary bearing 5 connects the drive shaft of the oil pump 3 (or the rotating shaft of the windmill 4) to the inner wall of the fuel chamber 23, so as to achieve smooth rotation and reduce friction.

[0024] During operation, the high-speed airflow enters the pipe body 1 and flows through the conical section 21 of the combustion stabilization structure 2, where it is guided, compressed, and accelerated. Simultaneously, the high-speed airflow impacts the fan 4, driving it to rotate around the slewing bearing 5. The fan 4 drives the oil pump 3 within the fuel chamber 23 to rotate synchronously, pressurizing the fuel and pumping it to the output side of the fuel chamber 23. The pressurized fuel is atomized and sprayed out through the first fuel nozzles 231 evenly arranged on the outer wall of the conical section 21, fully mixing with the high-speed airflow and burning stably within the recirculation zone formed by the combustion stabilization structure 2. The high-temperature, high-pressure gas generated by combustion is ejected from the rear end of the pipe body 1, generating thrust. The entire system utilizes the airflow's own energy to drive the oil pump, achieving automatic and continuous fuel supply without the need for an external power source or additional drive device.

[0025] The above technical solution couples the oil pump, windmill, and combustion stabilization structure together. The windmill rotates under the action of high-speed airflow, which in turn drives the oil pump to rotate, playing the role of stabilizing combustion and supplying oil. On the one hand, the airflow drives the windmill to drive the oil pump, eliminating the need for external energy, reducing weight and lowering costs. On the other hand, the faster the airflow, the more oil is supplied, ensuring stable combustion and achieving adaptive oil supply.

[0026] In this embodiment, the fuel chamber 23 penetrates the bottom surface of the conical portion 21, the drive shaft of the oil pump 3 is connected to the rotating shaft of the windmill 4, and the drive shaft of the oil pump 3 or the rotating shaft of the windmill 4 is connected to the inner wall of the fuel chamber 23 through the rotary bearing 5.

[0027] Specifically, the fuel chamber 23 penetrates the bottom surface of the conical part 21, forming an opening on the bottom surface of the conical part 21. The drive shaft of the oil pump 3 is connected to the rotating shaft of the windmill 4 through a coupling, and the drive shaft of the oil pump 3 or the rotating shaft of the windmill 4 is connected to the opening on the bottom surface of the conical part 21 through a slewing bearing 5.

[0028] Through the above technical solution, the wind turbine's rotating shaft is connected to the oil pump drive shaft via a coupling, efficiently transmitting rotational power to the oil pump and driving it to start.

[0029] In this embodiment, the blades of the windmill 4 are curved in an S-shape, and the angle of attack of the blades gradually decreases from the blade root to the blade tip.

[0030] Specifically, the overall profile of wind turbine blades features a continuous, smooth S-shaped curved structure, unlike straight blades or single-arc blades. This improves airflow along the spanwise direction and reduces aerodynamic noise and airflow separation. The angle of attack (Angle of Attack) is the angle between the airfoil chord of the blade profile and the direction of the incoming velocity. The angle of attack directly determines the blade's lift, drag, and aerodynamic efficiency. A gradually decreasing angle of attack means that from the blade root to the tip, along the spanwise direction, the angle of attack of each airfoil section continuously and smoothly decreases. This is a spanwise twist design, aiming to bring the entire blade close to the ideal angle of attack at the operating speed, thereby improving overall wind energy utilization efficiency. Through the above technical solution, the wind turbine blades adopt a curved S-shaped structure, and the angle of attack of the blades gradually decreases from the blade root to the blade tip; this structural design can adapt to the flow characteristics of high-speed airflow and can rotate smoothly and efficiently under the impact of high-speed airflow.

[0031] In this embodiment, the above-mentioned stable combustion structure 2 includes multiple support plates 22, which are evenly distributed around the tapered portion 21 and each extends radially along the tapered portion 21.

[0032] Specifically, the support plate 22 is a plate-shaped component in the flame stabilization structure 2 that serves to support, guide, divert, and stabilize the flame. Multiple support plates 22 are evenly distributed at equal angular intervals along the circumference. The support plates 22 extend outward from the center along the radial direction of the conical portion 21.

[0033] With the above technical solution, multiple support plates are evenly arranged around the conical part, which can make the airflow more evenly distributed in the circumferential direction, with good flow field symmetry, which is conducive to improving combustion stability; the overall structure is evenly stressed and reliably supported, and can still maintain structural stability in high temperature and high speed airflow, thus improving the overall reliability and service life of the device.

[0034] In this embodiment, the pipe wall of the pipe body 1 is provided with a first fuel input channel 11, at least part of the support plate portion 22 is provided with a second fuel input channel 24, the fuel chamber 23 is provided with a fuel inlet located on the fluid input side of the oil pump 3, the second fuel input channel 24 connects the first fuel input channel 11 and the fuel inlet of the fuel chamber 23, and the first fuel input channel 11 and the second fuel input channel 24 are used to transport fuel.

[0035] Specifically, the first fuel input channel 11 is located inside the pipe wall of the pipe body 1 and is used for transporting fuel. The second fuel input channel 24 is located inside the support plate portion 22 and is used for transporting fuel. The fuel inlet is located on the fuel chamber 23 and is the interface for fuel entry, situated on the fluid input side of the oil pump 3.

[0036] During operation, fuel enters through the first fuel input channel 11 and is transported to the fuel inlet of the fuel chamber 23 through the second fuel input channel 24 connected to it. When the oil pump 3 is working, it draws fuel from the fuel chamber 23 and supplies it to the outside, realizing continuous and stable fuel delivery.

[0037] The above technical solution utilizes the internal space of the pipe body and support plate to arrange fuel channels, completing fuel transportation without increasing the external volume. It features a compact structure, reasonable flow field and oil circuit layout, and reliable fuel supply.

[0038] In this embodiment, the fuel chamber 23 is provided with a fuel outlet located on the fluid output side of the oil pump. At least a portion of the support plate portion 22 is also provided with a first fuel output channel (not shown in the figure), and the pipe wall of the pipe body 1 is also provided with a second fuel output channel (not shown in the figure). The first fuel output channel connects the fuel outlet of the fuel chamber 23 and the second fuel output channel. The first fuel output channel and the second fuel output channel are used to transport fuel. The second fuel output channel is provided with a second fuel nozzle (not shown in the figure) for spraying fuel.

[0039] Specifically, the fuel outlet is located on the fuel chamber 23, on the fluid output side of the oil pump, serving as an opening for fuel output. A first fuel output channel is located inside the support plate 22, serving as a channel for transporting fuel. A second fuel output channel is located inside the pipe wall of the pipe body 1, also serving as a channel for transporting fuel. A second fuel injection hole is formed on the second fuel output channel, used to inject fuel and achieve fuel injection.

[0040] During operation, a portion of the fuel in the fuel chamber 23 is ejected through the first fuel nozzle 231, and another portion is output through the fuel outlet. The fuel flows sequentially through the first fuel output channel and the second fuel output channel, and is finally ejected outward through the second fuel nozzle, thus achieving stable fuel delivery and injection, providing fuel supply for combustion, and cooling the support plate at the same time.

[0041] The above technical solution allows fuel to be injected from the inner wall of the pipe to the outside, while simultaneously cooling the pipe and the support plate.

[0042] In this embodiment, the cavity of the tube body 1 includes an isolation section 13, an expansion section 14 and a combustion section 15 connected sequentially along the airflow direction, and the combustion stabilization structure 2 is disposed at one end of the expansion section 14 near the combustion section 15.

[0043] Specifically, the isolation section 13 is used to pre-treat the high-speed airflow, eliminate turbulence, and provide a stable intake environment for the expansion section 14; the expansion section 14 is used to install the combustion stabilization structure 2, and the combustion section 15 is used to achieve combustion.

[0044] Through the above technical solution, the tube body includes an isolation section, an expansion section, and a combustion section, which improves combustion stability and thrust efficiency.

[0045] In this embodiment, both the isolation section 13 and the combustion section 15 are cylindrical, and the inner diameter of the isolation section 13 is smaller than the inner diameter of the combustion section 15. The expansion section 14 is frustum-shaped, and its inner diameter gradually increases along the airflow direction.

[0046] Specifically, the overall cavity of pipe body 1 is a circular axisymmetric structure, which has advantages over rectangular combustion chambers such as lower heat load, lighter weight, and no corner flow effect. The cavity of pipe body 1 is designed according to the "equal-expansion-equal" flow area principle, with an expansion half-cone angle of 2.6° and a final expansion ratio of 1.8 for the combustion chamber. Isolation section 13 is cylindrical with a small inner diameter, used for rectification and stabilization of high-speed airflow. The small inner diameter enhances the axial consistency of the airflow, reduces turbulence, and provides stable intake conditions for the subsequent expansion section 14. Expansion section 14 is frustum-shaped with a gradually increasing inner diameter. The frustum-shaped expansion structure reduces the airflow velocity in the combustion zone, allowing for thorough mixing of fuel and airflow, while providing sufficient working space for the stable combustion structure and improving ignition stability. Combustion section 15 is cylindrical with a large inner diameter. The large inner diameter reduces exhaust resistance and accelerates the expansion of combustion products, thereby increasing the engine's thrust output.

[0047] Through the above technical solution, the tube cavity is designed according to the "equal-expansion-equal" flow area principle, which optimizes the energy distribution of airflow and improves the overall efficiency of the engine.

[0048] In this embodiment, the pipe body 1 includes a first pipe section 16, a second pipe section 17, and a third pipe section 18 connected sequentially along the airflow direction. The inner cavity of the first pipe section 16 is the isolation section 13, the inner cavity of the second pipe section 17 is the expansion section 14, and the inner cavity of the third pipe section 18 is the combustion section 15.

[0049] Specifically, the isolation section 13, expansion section 14 and combustion section 15 have different apertures. Therefore, the first pipe section 16, the second pipe section 17 and the third pipe section 18 are used to form the isolation section 13, the expansion section 14 and the combustion section 15 respectively.

[0050] Through the above technical solution, the pipe body includes multiple pipe sections, which can easily form the above-mentioned isolation section, the above-mentioned expansion section and the above-mentioned combustion section.

[0051] In this embodiment, the slewing bearing 5 is a cylindrical roller bearing.

[0052] Specifically, the raceway of the cylindrical roller bearing is in line contact with the roller, which can withstand a large radial load and accurately support the stable combustion structure 2, ensuring that its rotation axis is completely coaxial with the tube cavity, thus avoiding wobble or shaking during high-speed rotation.

[0053] The above technical solution uses cylindrical roller bearings for the slewing bearing, which is suitable for connecting the engine body and the combustion stability structure.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-speed combustion engine with a windmill-driven oil pump, characterized in that, include: The tube body, whose cavity is used to receive high-speed airflow and eject combustion gases; A combustion stabilization structure is installed inside the cavity of the pipe body. The combustion stabilization structure includes a conical part and a support plate part. The central axis of the conical part is coaxial with the central axis of the pipe body, and the apex of the conical part faces the air inlet of the pipe body. The conical part is provided with a fuel chamber for temporarily storing fuel. The fuel chamber is provided with a plurality of first fuel injection holes, which are evenly distributed around the central axis of the conical part on the outer side wall of the conical part for injecting fuel. The support plate part connects the conical part and the pipe body. An oil pump is located inside the fuel chamber. When the oil pump rotates, it can pump fuel into the fuel chamber. The first fuel injection hole is located on the fuel output side of the oil pump. A windmill is located inside the cavity of the pipe body and is rotatably connected to the bottom end of the conical part via a slewing bearing. The windmill can rotate under the action of airflow in the pipe body and drive the oil pump to rotate.

2. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The fuel chamber extends through the bottom surface of the conical section, the drive shaft of the oil pump is connected to the rotating shaft of the windmill, and the drive shaft of the oil pump or the rotating shaft of the windmill is connected to the inner wall of the fuel chamber through the slewing bearing.

3. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The windmill blades are curved in an S-shape, with the angle of attack gradually decreasing from the blade root to the blade tip.

4. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The combustion stabilization structure includes multiple support plates, which are evenly distributed around the conical portion and each extends radially along the conical portion.

5. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The pipe body has a first fuel input channel on its wall and at least a portion of the support plate has a second fuel input channel. The fuel chamber has a fuel inlet located on the fluid input side of the oil pump. The second fuel input channel connects the first fuel input channel and the fuel inlet of the fuel chamber. The first fuel input channel and the second fuel input channel are used to transport fuel.

6. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The fuel chamber is provided with a fuel outlet located on the fluid output side of the oil pump. At least a portion of the support plate is also provided with a first fuel output channel, and the pipe wall of the pipe body is also provided with a second fuel output channel. The first fuel output channel connects the fuel outlet of the fuel chamber and the second fuel output channel. The first fuel output channel and the second fuel output channel are used to transport fuel. The second fuel output channel is provided with a second fuel nozzle for spraying fuel.

7. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The tube body includes an isolation section, an expansion section, and a combustion section connected sequentially along the airflow direction, and the combustion stabilization structure is located at one end of the expansion section near the combustion section.

8. The high-speed combustion engine with a windmill-driven oil pump according to claim 7, characterized in that, Both the isolation section and the combustion section are cylindrical, and the inner diameter of the isolation section is smaller than that of the combustion section. The expansion section is frustum-shaped, and its inner diameter gradually increases along the airflow direction.

9. The high-speed combustion engine with a windmill-driven oil pump according to claim 7, characterized in that, The pipe body includes a first pipe section, a second pipe section, and a third pipe section connected sequentially along the airflow direction. The inner cavity of the first pipe section is the isolation section, the inner cavity of the second pipe section is the expansion section, and the inner cavity of the third pipe section is the combustion section.

10. The high-speed combustion engine with a windmill-driven oil pump according to claim 1, characterized in that, The slewing bearing is a cylindrical roller bearing.

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