Rot-free particle separator and aircraft engine

Abstract

This application discloses a non-rotating particle separator. Its inner wall is a rotating curved surface, with the point where the distance between the inner wall and the center line of rotation is greatest forming a vertex. An outer wall surrounds the inner wall, and the outer and inner walls together form a separation channel. One end of the separation channel is an inlet, and the other end is an outlet. The cross-sectional area of ​​the separation channel gradually increases from the vertex position towards the inlet and outlet positions. A flow divider is disposed at the outlet end of the separation channel, dividing the outlet into a cleaning channel near the outer wall and a gas channel near the inner wall. The inner wall forms a windward surface from the inlet to the vertex position, with an exhaust port on the windward surface. The inner wall forms a leeward surface from the outlet to the vertex position, with an intake port on the leeward surface. A guide channel is disposed between the intake and exhaust ports, located outside the separation channel. A pumping device is disposed within the guide channel to transport gas from the intake port to the exhaust port. This application addresses the technical problem of the contradiction between air intake loss and fine sand separation efficiency, improving fine sand separation efficiency while minimizing the impact on air intake loss.

Description

Technical Field

[0001] This invention relates to the field of aircraft turboshaft engine technology, and in particular, to a non-rotating particle separator. Background Technology

[0002] During takeoff, landing, and hovering / flight near the ground, helicopters generate airflow under the rotor that picks up various debris such as sand, dust, leaves, grass, and birds from the ground. This debris is then ingested into the engine, causing serious damage and reducing its performance and lifespan. Sand and dust are the most damaging to the engine and are the most difficult to protect against. To address this, various helicopter propulsion protection devices have been invented. Currently, the most commonly used sand and dust protection device is the integrated particle separator. Integrated particle separators are suitable for different helicopter models and have all-weather operation capabilities. The integrated particle separator uses a special design of the airflow channel within the intake component to create a sharp bend or rotation in the airflow. Taking advantage of the fact that the inertia of sand and dust is greater than that of air, it separates these debris from the engine inlet airflow. Integrated particle separators are further divided into pre-rotating particle separators and non-rotating particle separators. Non-rotating particle separators have higher separation efficiency and lower total intake pressure loss than pre-rotating separators and are the mainstream of modern integrated particle separators.

[0003] The flow channel of a non-rotating particle separator consists of an inner wall, an outer wall, a splitting lip, and support plates or blades. Its main characteristic is a curved, bifurcated flow channel. The channel area before the apex of the inner wall hump gradually decreases with airflow, while the channel area after the apex gradually increases. It primarily utilizes the high inertia of sand and dust particles as they sharply bend in the airflow, causing them to detach from the airflow trajectory and enter the cleaning channel outside the splitting lip for discharge. Generally, increasing the height of the hump on the inner wall of the particle separator increases the separation efficiency of the non-rotating particle separator for fine sand; however, increasing the hump height also leads to increased air intake losses. Therefore, there is a trade-off between the pressure loss and the fine sand separation efficiency of the particle separator. Summary of the Invention

[0004] This invention provides a non-rotating particle separator to solve the technical problem of the contradiction between air intake loss and fine sand separation efficiency, thereby improving fine sand separation efficiency while reducing air intake loss.

[0005] According to one aspect of the present invention, a non-rotating particle separator is provided, comprising an inner wall arranged in the form of a rotational curved surface, wherein the point where the distance between the inner wall and the rotational center line is the greatest forms an apex; an outer wall surrounding the inner wall, the outer wall and the inner wall together forming a separation channel, one end of the separation channel being an inlet and the other end being an outlet, the cross-sectional area of ​​the separation channel gradually increasing from the apex position towards the inlet and outlet positions; a flow divider disposed at the outlet end of the separation channel, the flow divider dividing the outlet of the flow divider channel into a purging channel near the outer wall and a gas channel near the inner wall; the inner wall forming a windward surface from the inlet to the apex position of the separation channel, an exhaust port disposed on the windward surface, and a leeward surface from the outlet to the apex position of the separation channel, an intake port disposed on the leeward surface, a guide channel disposed between the intake port and the exhaust port, the guide channel being located outside the separation channel, and a pumping device disposed within the guide channel to transport gas from the intake port to the exhaust port.

[0006] By adopting the above technical solution, the airflow discharged from the exhaust port is blown into the separator channel from the windward side of the inner wall, blowing the fine sand towards the part near the outer wall, thereby improving the separation efficiency of fine sand. At the same time, a large separation area will be generated in the apex area. If the low-energy airflow in the separation area enters the main channel, the total pressure loss of the main channel outlet will increase significantly. The pumping device can draw in the low-energy airflow in the separation area through the air inlet and then supply it to the exhaust port for blowing. This not only reduces the total pressure loss, but also completes the internal circulation of air, so that the blowing port does not need to introduce airflow from the outside. This solves the technical problem of the contradiction between air intake loss and fine sand separation efficiency, and has a small impact on air intake loss while improving the fine sand separation efficiency.

[0007] Optionally, the pumping device includes a centrifugal fan installed in the air guide channel and a motor that drives the centrifugal fan to rotate. The centrifugal fan rotates under the drive of the motor, so that the air pressure at the end of the air guide channel near the air inlet is lower than the air pressure at the end of the air guide channel near the air outlet.

[0008] By adopting the above technical solution, the centrifugal fan can pressurize the gas drawn in from the intake port, making the airflow blown out from the exhaust port more energetic, thus better blowing the fine sand towards the part near the outer wall and improving the separation efficiency.

[0009] Optionally, the diverter is formed into a diverter lip near the inlet of the separation channel, and the distance between the diverter lip and the rotation center line of the inner wall is less than the distance between the apex and the center line.

[0010] By adopting the above technical solution, the position of the diversion lip is lower than the position of the apex, so that the airflow needs to make a sharp turn after passing the apex before entering the gas channel below the diversion lip. Due to inertia, impurities such as fine sand cannot turn in time and will collide with the side of the diversion lip closest to the diversion channel, and then be discharged from the diversion channel. Therefore, this setting of the diversion lip can effectively improve the separation efficiency.

[0011] Optionally, the outlet direction of the exhaust port is perpendicular to the windward side of the inner wall.

[0012] By adopting the above technical solution, the gas discharged from the exhaust port is blown into the separation channel from a vertical angle to the windward side, which is roughly perpendicular to the main airflow in the separation channel. This makes the sand and dust in the main airflow have a stronger tendency to leave the inner wall, while having less impact on the flow field of the main channel, that is, the overall performance is better.

[0013] Optionally, the ratio of the cross-sectional area of ​​the intake port to the cross-sectional area of ​​the exhaust port is greater than two.

[0014] By adopting the above technical solution, when the cross-sectional area of ​​the air intake is large, the power loss of the centrifugal fan motor during air intake can be reduced, thereby reducing the power consumption of the particle separator.

[0015] Optionally, the pressure ratio of the centrifugal fan is less than two, and the ratio of the airflow rate blown from the exhaust port to the total airflow rate in the separation channel is not greater than 2.5%.

[0016] By adopting the above technical solution, the temperature of the gas will rise during the compression process. When the air pressure ratio is too high, the temperature of the air entering the separation channel from the exhaust port will be too high, which will lead to an increase in the temperature of the gas discharged from the particle separator outlet, resulting in a decrease in the performance of the turboshaft engine. When the flow rate of the air entering the separation channel from the exhaust port is too high, it will have a significant impact on the trajectory of the main airflow in the separation channel, which will significantly increase the total pressure loss of the main airflow outlet.

[0017] Optionally, the air guiding channel includes: an air intake chamber, located on the inner wall away from the separation channel, and connected to the air intake port; an exhaust chamber, located on the inner wall away from the separation channel, and connected to the exhaust port; and a compression chamber, connecting the air intake chamber and the exhaust chamber. The centrifugal fan is located inside the compression chamber, and the motor is located on the outer wall of the compression chamber, with the motor output shaft extending into the compression chamber and connected to the centrifugal fan.

[0018] Optionally, the air intake and exhaust ports are perforated, and multiple air intake and exhaust ports are spaced apart on the inner wall along the circumference. The air intake chamber and exhaust chamber are annular along the circumference of the inner wall, with the air intake chamber connected to all air intake ports and the exhaust chamber connected to all exhaust ports.

[0019] By adopting the above technical solution, multiple intake and exhaust ports are distributed circumferentially, which can make the main airflow in all directions of the separation channel more uniform, have less impact on the flow field, and thus reduce pressure loss.

[0020] Optionally, the intake and exhaust ports are annular, rotating around the center line of the inner wall.

[0021] By adopting the above technical solution, the annular air inlet and outlet can make the airflow completely consistent in all directions of the inner circumference, which has little impact on the flow field and thus reduces pressure loss.

[0022] According to another aspect of the invention, an aircraft engine is also provided, which includes the aforementioned irrotational particle separator.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The airflow discharged from the exhaust port is blown into the separator channel from the windward side of the inner wall, blowing the fine sand towards the part near the outer wall, thereby improving the separation efficiency of the fine sand;

[0025] 2. The pumping device can draw in low-energy airflow from the separation area through the air inlet and then supply it to the exhaust port for blowing. This not only reduces the total pressure loss but also completes the internal circulation of air, so that the blowing port does not need to introduce airflow from the outside, thus solving the technical problem of the contradiction between air intake loss and fine sand separation efficiency.

[0026] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 The results are numerical simulations of the motion trajectory of 5μm diameter sand particles in the flow channel of a non-rotating particle separator.

[0029] Figure 2 The results are numerical simulations of the motion trajectory of 300μm diameter sand particles in the flow channel of a non-rotating particle separator.

[0030] Figure 3 The numerical simulation results show the motion trajectory of a 5μm diameter sand particle in the flow channel of the non-rotating particle separator in this embodiment of the application.

[0031] Figure 4 This is a schematic diagram of the structure of the irrotational particle separator according to an embodiment of this application.

[0032] Legend:

[0033] 1. Exhaust port; 2. Exhaust chamber; 3. Exhaust chamber inlet pipe; 4. Centrifugal fan; 5. Motor; 6. Inlet; 7. Inlet chamber; 8. Inlet chamber outlet pipe; 9. Inner wall; 10. Outer wall; 11. Diverter; 12. Apex; 13. Diverter lip; 14. Pumping device; 15. Inlet; 16. Outlet. Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a uniform non-rotating particle separator and an aero-engine.

[0037] During takeoff, landing, hovering, and flight, helicopters experience airflow from the rotor that picks up various foreign objects from the ground and sucks them into the engine, causing serious damage, reducing engine performance and lifespan. Sand and dust, in particular, cause the most severe damage and are the most difficult to protect against. To address this, various helicopter power protection devices have been invented. Currently, the most commonly used sand and dust protection devices include filters installed before the helicopter's air intake, multi-tube particle separators, and integrated particle separators that are part of the engine. Among the three types of particle separators, the screen separator has the highest efficiency, achieving a fine sand separation efficiency of up to 99%. However, it is bulky and requires frequent cleaning or replacement, making maintenance difficult. The multi-tube particle separator is the next most efficient, with a fine sand separation efficiency greater than 90%. It does not require frequent cleaning, but its size is also relatively large, increasing the aircraft's external drag, and it cannot operate for extended periods in icing environments. The integral particle separator has a lower separation efficiency than the previous two, but its fine sand separation efficiency is still greater than 80%. It is suitable for different helicopter models and is the only one of the three particle separators with all-weather operation capabilities. It also has multiple other functions, such as air intake, load-bearing, and lubricating oil cooling. Therefore, modern advanced turboshaft engines, such as the T700, T800, RTM322, and T901 turboshaft engines, all feature integral particle separators.

[0038] An integrated particle separator is an intake component of a turboshaft engine, the power plant of a helicopter. Through a special design of its own flow channels, the airflow undergoes a sharp turn or rotation, utilizing the fact that dust and other foreign objects have greater inertia than air to separate them from the engine inlet airflow. Integrated particle separators are further divided into pre-swirl particle separators and non-swirl particle separators. Non-swirl particle separators have higher separation efficiency and lower total intake pressure loss than pre-swirl separators; therefore, they are the mainstream type of modern integrated particle separator.

[0039] The principle of the non-rotating particle separator is that fine sand (dust particles with a diameter of less than 30μm) mainly utilizes its own inertia when the dust particles make a sharp turn in the airflow to break away from the airflow trajectory and enter the cleaning channel outside the splitting lip for discharge. Figure 1 This is the result of numerical simulation of the motion trajectory of 5μm diameter sand particles in the flow channel of a non-rotating particle separator. Coarse sand (dust with a diameter greater than 100μm) mainly utilizes the property of sand colliding and rebounding with the wall surface to focus the rebounded sand into the cleaning channel and be discharged. Figure 2 The results are numerical simulations of the motion trajectory of 300μm diameter sand particles in the flow channel of a non-rotating particle separator.

[0040] Generally speaking, increasing the height of the hump on the inner wall of a particle separator increases the separation efficiency of a non-rotating particle separator for fine sand, but the opposite is true for coarse sand; increasing the hump height may actually reduce the separation efficiency of the non-rotating particle separator for coarse sand. On the other hand, increasing the hump height also increases the air intake loss of the particle separator. Therefore, the air intake loss, coarse sand separation efficiency, and fine sand separation efficiency of the particle separator are contradictory, and a compromise design is necessary to achieve an optimal balance among the three.

[0041] Studies have found that blowing external gas into the particle separator channel from the windward side of the hump, directing fine sand towards the area near the outer wall, can improve the separation efficiency of the fine sand. The closer the blowing airflow is to the apex of the windward side of the hump, the more significant the improvement in fine sand separation efficiency. However, at the same time, a large separation area is generated at the top of the hump, and the closer to the apex, the larger the separation area becomes. The low-energy airflow within the separation area, after entering the main flow channel, significantly increases the total pressure loss at the outlet of the main flow channel. Numerical simulation results show that the total pressure loss of the main flow channel of the particle separator is 3-4 times that of a conventional irrotational particle separator. Furthermore, if high-pressure airflow from the engine compressor is used as the air source, due to the increasingly higher pressure ratio and fewer stages in modern turboshaft engines, the pressure and temperature of the airflow drawn from the intermediate stages of the compressor are also increasing. Generally speaking, the airflow temperature at the bleed air inlet of a modern turboshaft engine is greater than the temperature of the external atmosphere by more than 260°C. This leads to an increasing direct power loss in the engine due to bleed air, and the high-temperature bleed airflow entering the particle separator increases the total temperature of the airflow at the particle separator outlet by more than 8 degrees Celsius. The combined effect of these two factors can cause a performance degradation of over 20% in turboshaft engines, potentially even to the point of rendering the engine malfunctioning. Therefore, the existing air-blowing solution is too costly to be practically applied in engineering.

[0042] Reference Figure 3The non-rotating particle separator of this embodiment includes an inner wall 9, an outer wall 10, and a flow divider 11. The inner wall 9 is a curved surface of revolution, with a hump formed in the middle of the inner wall 9 protruding away from the center line of revolution. The distance between the inner wall 9 and the center point of revolution is greatest at the apex 12 of the hump. The outer wall 10 is also a curved surface of revolution. In one specific embodiment, the center line of revolution of the outer wall 10 is coaxial with the center line of revolution of the inner wall 9. The outer wall 10 surrounds the inner wall 9, and the outer wall 10 and the inner wall 9 together form a separation channel. One end of the separation channel is an inlet 15, and the other end is an outlet 16. The cross-sectional area of ​​the separation channel gradually increases from the apex 12 towards the inlet 15 and the outlet 16.

[0043] The diverter 11 is located at the air outlet 16 end of the separation channel. The diverter 11 divides the air outlet 16 of the separation channel into a purging channel near the outer wall 10 and a gas channel near the inner wall 9. The diverter 11 forms a diverter lip 13 at the end near the inlet 15 of the separation channel. The distance between the diverter lip 13 and the rotation center line of the inner wall 9 is less than the distance between the vertex 12 and the center line. The distance between the diverter lip and the rotation center line of the inner wall 9 is less than the distance between the vertex 12 and the center line. That is, the radius of the diverter lip 13 is lower than the highest vertex 12 of the hump. The diverter lip 13 is not visible from the particle separator inlet 15. The diverter lip 13 is hidden.

[0044] The inner wall 9 forms a windward surface from the inlet 15 of the separation channel to the top 12, and an exhaust port 1 is provided on the windward surface. The inner wall 9 forms a leeward surface from the outlet 16 of the separation channel to the top 12, and an intake port 6 is provided on the leeward surface. An air guide channel is provided between the intake port 6 and the exhaust port 1. The air guide channel is located outside the separation channel. A pumping device 14 is provided in the air guide channel to transport the gas from the intake port 6 to the exhaust port 1.

[0045] Figure 3 This is a flow path diagram of the airflow in the flow channel of the novel particle separator with both intake and blowing functions proposed in this invention. As can be seen from the diagram, the intake port 6 reduces the large separation area formed by the blowing airflow and draws away the low-energy airflow, thus ensuring that only high-energy airflow flows into the main flow channel. CFD numerical simulation results show that the total pressure loss at the main flow outlet 16 of the particle separator is only about 0.2% higher than that of a conventional (non-blowing) irrotational particle separator. Simultaneously, the numerical simulation results of the particle trajectory ( Figure 3 This indicates that 100% of 5μm diameter sand particles can still be separated. While improving separation efficiency, the impact on total pressure loss is small. Furthermore, this solution does not require adjustment of the height of the inner wall 9 hump. Larger diameter sand particles, such as 300μm sand particles, will enter the cleaning channel after colliding and rebounding with the outer wall 10 without being affected. This achieves a good balance between the air pressure loss, coarse sand separation efficiency, and fine sand separation efficiency of the particle separator.

[0046] Experiments revealed that the direction of the air inlet significantly impacts performance. In one specific embodiment of this application, the outlet direction of the exhaust port 1 is perpendicular to the windward side of the inner wall 9, allowing the air to enter perpendicular to the wall surface. This strengthens the tendency of sand and dust to leave the inner wall 9 while minimizing the impact on the flow field of the main channel, resulting in optimal overall performance. The air inlet is generally positioned a certain distance in front of the apex 12 of the hump. Being too close to the apex 12 will result in a large separation area, while being too far will lead to poor separation. Simultaneously, the location of the intake port 6 is also crucial. Iterative calculations are required during the design process to ensure that the intake port 6 effectively draws in all the separated airflow generated by the air inlet. If the separator airflow enters the main channel, the total pressure loss of the main channel will be too large.

[0047] The air intake 6 is located on the leeward side behind the hump. Larger fine sand particles, such as those larger than 5 micrometers, are not easily drawn into the air intake 6 due to inertia and are far from the leeward side. Because the smaller the sand particle size, the better the flowability, some smaller sand particles, such as those smaller than 3 micrometers, will enter the air intake 6 with the airflow. Since these particles are small, they have little impact on the pumping device 14.

[0048] Reference Figure 4 The air guiding channel includes an intake chamber 7, an exhaust chamber 2, and a compression chamber. The intake chamber 7 is located on the inner wall 9 away from the separation channel and is connected to the intake port 6. The exhaust chamber 2 is located on the inner wall 9 away from the separation channel and is connected to the exhaust port 1. The compression chamber connects the intake chamber 7 and the exhaust chamber 2. The pumping device 14 is located in the air guiding channel. An intake chamber outlet pipe 8 is provided between the compression chamber and the intake chamber 7. The intake chamber outlet pipe 8 is fixedly connected to the compression chamber inlet 15 and the intake chamber 7 outlet respectively through flanges. An exhaust chamber inlet pipe 3 is provided between the compression chamber and the exhaust chamber 2. The exhaust chamber inlet pipe 3 is fixedly connected to the compression chamber outlet and the exhaust chamber inlet respectively through flanges.

[0049] In one specific embodiment of this application, the intake port 6 and exhaust port 1 are perforated, and multiple intake ports 6 and exhaust ports 1 are spaced apart along the circumference of the inner wall 9. This circumferential distribution of multiple intake ports 6 and exhaust ports 1 ensures a more uniform main airflow in all directions of the separation channel, minimizing the impact on the flow field and thus reducing pressure loss. Furthermore, the equal spacing between the intake ports 6 and the equal distance between the exhaust ports 1 further enhances the uniformity of the flow field distribution within the separation channel. In another specific embodiment of this application, both the intake port 6 and exhaust port 1 are annular narrow slits rotating around the center line of the inner wall 9. This ensures that the blowing airflow is completely consistent in all directions around the circumference of the inner wall 9, minimizing the impact on the flow field and further reducing pressure loss.

[0050] The pumping device 14 includes a centrifugal fan 4 disposed in the air guide channel and a motor 5 that drives the centrifugal fan 4 to rotate. The centrifugal fan 4 rotates under the drive of the motor 5, so that the air pressure at the end of the air guide channel near the air intake port 6 is lower than the air pressure at the end of the air guide channel near the exhaust port 1. The centrifugal fan 4 is disposed in the compression chamber, and the motor 5 is disposed on the outer wall 10 of the compression chamber, and the output shaft extends into the compression chamber and is connected to the centrifugal fan 4.

[0051] When the ratio of the cross-sectional area of ​​the intake port 6 to the cross-sectional area of ​​the exhaust port 1 is greater than 2, the larger cross-sectional area of ​​the intake port 6 can reduce the power loss of the centrifugal fan 4 motor 5 during intake, thus reducing the power consumption of the particle separator. When the ratio of the cross-sectional area of ​​the intake port 6 to the cross-sectional area of ​​the exhaust port 1 is less than 2, the intake port is too small, and the centrifugal fan needs to increase its speed to increase the airflow velocity at the intake port in order to obtain the same volume of gas. At the same time, if the airflow velocity at the intake port is too fast, the pressure loss of the main airflow in the gas channel will increase.

[0052] The pressure ratio of centrifugal fan 4 is less than two. At this time, the temperature rise of the airflow at the outlet 16 of centrifugal fan 4 is generally less than 75°. The ratio of the airflow rate blown out from the exhaust port 1 to the total airflow rate in the separation channel is not greater than 2.5%. Therefore, the temperature rise of the airflow at the outlet 16 of the particle separator caused by the blowing airflow is less than 2 degrees. At the same time, since the intake loss is basically not increased, the impact of the device of this invention on engine performance is less than 5%, and it is engineering feasible.

[0053] By comprehensively analyzing the movement trajectories of sand particles of different sizes and employing both blowing and suction measures, the new particle separator achieves a total separation efficiency of 4-5 percentage points for standard fine sand with a diameter of 0-200μm and an average diameter of approximately 30μm, compared to ordinary particle separators. This significantly improves the service life of turboshaft engines in sandy environments, while the intake loss of the particle separator is essentially the same as that of ordinary particle separators.

[0054] This application discloses an aero-engine including the aforementioned irrotational particle separator.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A non-rotational particle separator, characterized in that, include: The inner wall (9) is set as a rotating curved surface, and the vertex (12) is formed at the point where the distance between the inner wall (9) and the center line of rotation is the largest. The outer wall (10) surrounds the outer wall (9). The outer wall (10) and the inner wall (9) together form a separation channel. One end of the separation channel is the inlet (15), and the other end of the separation channel is the air outlet (16). The cross-sectional area of ​​the separation channel gradually increases from the vertex (12) position to the inlet (15) and the air outlet (16) position. A diverter (11) is provided at the air outlet (16) end of the separation channel. The diverter (11) divides the air outlet (16) of the diverter channel into a purging channel near the outer wall (10) and a gas channel near the inner wall (9). The inner wall (9) forms a windward surface from the entrance (15) of the separation channel to the top (12), and an exhaust port (1) is provided on the windward surface. The inner wall (9) forms a leeward surface from the air outlet (16) of the separation channel to the top (12), and an air inlet (6) is provided on the leeward surface. An air guide channel is provided between the air inlet (6) and the exhaust port (1). The air guide channel is located outside the separation channel. A pumping device (14) is provided in the air guide channel to transport the gas from the air inlet (6) to the exhaust port (1). The pumping device can draw in the low-energy airflow in the separation area through the air inlet and then supply it to the exhaust port for blowing.

2. The non-rotating particle separator according to claim 1, characterized in that: The pumping device (14) includes a centrifugal fan (4) installed in the air guide channel and a motor (5) that drives the centrifugal fan (4) to rotate. The centrifugal fan (4) rotates under the drive of the motor (5), so that the air pressure at the end of the air guide channel near the air inlet (6) is less than the air pressure at the end of the air guide channel near the air outlet (1).

3. The non-rotating particle separator according to claim 1, characterized in that: The diverter (11) forms a diverter lip (13) near the inlet (15) of the separation channel. The distance between the diverter lip (13) and the rotation center line of the inner wall (9) is less than the distance between the vertex (12) and the center line.

4. The non-rotating particle separator according to claim 1, characterized in that: The outlet direction of the exhaust port (1) is perpendicular to the windward side of the inner wall (9).

5. The non-rotating particle separator according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the intake port (6) to the cross-sectional area of ​​the exhaust port (1) is greater than 2.

6. The non-rotating particle separator according to claim 2, characterized in that: The pressure ratio of the centrifugal fan (4) is less than 2, and the ratio of the airflow rate blown out from the exhaust port (1) to the total airflow rate in the separation channel is not greater than 2.5%.

7. The non-rotating particle separator according to claim 6, characterized in that, The air guiding channel includes: The suction chamber (7) is located on the inner wall (9) away from the separation channel, and the suction chamber (7) is connected to the suction port (6); The exhaust chamber (2) is located on the side of the inner wall (9) away from the separation channel, and the exhaust chamber (2) is connected to the exhaust port (1); The compression chamber connects the intake chamber (7) and the exhaust chamber (2). The centrifugal fan (4) is located inside the compression chamber, and the motor (5) is located on the outer wall (10) of the compression chamber. The output shaft of the motor (5) extends into the compression chamber and connects with the centrifugal fan (4).

8. The non-rotating particle separator according to claim 7, characterized in that: The air intake (6) and the exhaust (1) are perforated. Multiple air intakes (6) and exhausts (1) are arranged at intervals along the circumference on the inner wall (9), and the air intakes (6) and exhausts (1) correspond one to one.

9. The non-rotating particle separator according to claim 7, characterized in that: Both the intake port (6) and the exhaust port (1) are annular around the center line of the inner wall (9).

10. An aircraft engine, characterized in that: Includes the irrotational particle separator according to any one of claims 1-9.

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