Particle separator inner wall component anti-icing system and aircraft engine

Abstract

The present invention discloses an anti-icing system for an inner wall component of a particle separator, wherein a front outer wall is partially concave to form a concave wall, and an impact hole connected to an anti-icing interlayer is opened on the concave wall, and then an exhaust baffle is covered on the front outer wall to enclose the concave wall to form an exhaust cavity connected to the impact hole, and at the same time, an exhaust gap connected to the exhaust cavity is formed by maintaining a preset distance with the front outer wall at the rear end of the concave wall to realize buried exhaust, and finally the various components are enclosed to form an inner flow channel connected to the exhaust gap and through which mainstream gas can flow, which greatly reduces exhaust mixing loss and interference of exhaust gas on the movement trajectory of supercooled water droplets in the mainstream gas, eliminates the possibility of supercooled water droplets colliding and clearing non-anti-icing areas of the casing under exhaust interference, and forms a protective gas film in the exhaust area of ​​the front outer wall, reduces the impact efficiency of supercooled water droplets, and reduces the anti-icing load of the exhaust area. At the same time, the buried exhaust port is not easily blocked by ice, thereby improving the anti-icing response rate.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engines, and in particular to an anti-icing system for an inner wall assembly of a particle separator. Furthermore, the present invention also relates to an aircraft engine comprising the anti-icing system for an inner wall assembly of a particle separator. Background Art

[0002] When a helicopter encounters meteorological conditions containing supercooled water droplets, the supercooled water droplets that hit the windward surface will freeze. The most significant ice formation is on the helicopter rotor and engine inlet. Rotor ice will cause the helicopter's lift to decrease, and engine inlet ice will cause the internal flow aerodynamic characteristics to deteriorate and power to drop. If the accumulated ice falls off, it may damage other engine components and cause more serious consequences. Therefore, anti-icing measures are usually required for the windward surface of the engine inlet to ensure the engine's all-weather operation capability.

[0003] The engine's integral inertial particle separator utilizes the different inertial forces generated by sand and dust particles when turning in a steeply curved hump-shaped flow channel. It flings solid particles with greater inertial forces toward the periphery and discharges them from the peripheral cleaning flow channel. Structurally, this steep hump-shaped internal flow channel and its ancillary structures are called inner wall components. Since the inner wall component has a large windward area, the engine is more susceptible to icing when operating in a low-temperature environment. Therefore, an anti-icing system needs to be designed for the inner wall component.

[0004] Existing interior wall component anti-icing systems, such as Figure 1 and Figure 2 As shown, the anti-icing hot air of the inner wall assembly enters the interlayer formed by the rear outer wall and inner wall from the rear mounting edge, flows forward through the interlayer formed by the front outer wall and inner wall, and then exits into the main channel through the exhaust holes at the front end of the front outer wall. This hot air flow in the narrow channel heats the metal wall surface, achieving the anti-icing function, while the hot air is simultaneously discharged through the exhaust holes. The hot air is discharged through an open exhaust method, with the exhaust holes located at the front end of the front outer wall. The exhaust holes are evenly distributed along the circumference, and the center lines of the exhaust holes form an acute angle with the front outer wall. This exhaust method can meet the exhaust function and has a simple structure.

[0005] However, the main problem is that the particle separator principle determines that the slope of its front outer wall is relatively large. In order to meet the processability of the hole, the angle between the center line of the exhaust hole and the wall cannot be too small, resulting in a large angle between the exhaust direction and the mainstream direction. Experiments have shown that due to the high exhaust speed, the exhaust will form a strong aerodynamic interference at this location, increasing the mixing loss of the exhaust and the mainstream. More importantly, it affects the motion trajectory of the supercooled water droplets in the mainstream, causing the impact area of ​​the supercooled water droplets to change, which may cause supercooled water droplets to hit areas where there were no water droplets originally, thereby causing local failure of the anti-icing system. Summary of the Invention

[0006] The present invention provides an anti-icing system for the inner wall assembly of a particle separator and an aircraft engine, so as to solve the technical problems that the anti-icing system for the inner wall assembly of a particle separator in the existing aircraft engine increases the exhaust mixing loss and easily interferes with the movement trajectory of supercooled water droplets, which may cause local failure of the anti-icing system.

[0007] According to one aspect of the present invention, an anti-icing system for an inner wall assembly of a particle separator is provided, comprising a cleaning casing, a front outer wall, a rear outer wall, an inner wall, a front mounting edge connected to the front outer wall and the inner wall respectively, a rear mounting edge connected to the rear outer wall and the inner wall respectively, and an anti-icing interlayer for hot air to flow through formed by the front outer wall, the rear outer wall, the inner wall, the front mounting edge and the rear mounting edge. The system also comprises a concave wall which is located on the side of the front outer wall close to the front mounting edge and is concave inwardly toward the front mounting edge, an impact hole opened on the concave wall and connected to the anti-icing interlayer, and an exhaust baffle which is attached to the front outer wall at the front end of the concave wall and maintains a preset distance from the front outer wall at the rear end of the concave wall. The exhaust baffle and the concave wall enclose an exhaust cavity connected to the impact hole. The preset distance between the exhaust baffle and the front outer wall at the rear end of the concave wall is an exhaust gap connected to the exhaust cavity. The cleaning casing, the exhaust baffle, the front outer wall and the rear outer wall enclose an inner flow channel for mainstream gas flow connected to the exhaust gap.

[0008] As a further improvement of the above technical solution:

[0009] Furthermore, the flow area of ​​the exhaust gap is not less than the total flow area of ​​all impact holes on the concave wall.

[0010] Furthermore, the outer slope of the front outer wall at the rear end of the concave wall and the inner slope of the exhaust baffle at the rear end of the concave wall are consistent.

[0011] Furthermore, the exhaust baffle at the rear end of the concave wall is bent toward the front outer wall close to the rear end of the concave wall.

[0012] Furthermore, the concave wall includes a first wall surface arranged near the front outer wall of the concave wall front end, a second wall surface arranged near the front outer wall of the concave wall rear end, and a third wall surface arranged between the first wall surface and the second wall surface, and the impact hole is arranged on the third wall surface.

[0013] Furthermore, exhaust support plates are arranged in the exhaust gap and are respectively connected to the exhaust baffle at the rear end of the concave wall and the front outer wall at the rear end of the concave wall, and a plurality of exhaust support plates are arranged at intervals along the circumferential direction.

[0014] Furthermore, a plurality of impact holes are provided along the circumferential direction of the concave wall, and a plurality of rows of impact holes are provided along the axial direction of the concave wall.

[0015] Furthermore, the ratio of the hole length to the hole diameter of the impact hole is in the range of 0.5-1.5; and / or the diameter of the impact hole is in the range of 0.6-1.6 mm; and / or the exhaust baffle and the concave wall maintain an impact spacing, and the ratio of the impact spacing to the impact hole diameter is in the range of 1-4; and / or the ratio of the spacing between two adjacent impact holes in the circumferential direction to the impact holes is in the range of 3-10.

[0016] Furthermore, the middle and rear ends of the cleaning case are provided with anti-icing structures, and the normal extension line of the exhaust baffle at the rear end of the concave wall intersects with the inner flow channel profile line of the cleaning case and the intersection is located at the middle or rear end of the cleaning case.

[0017] According to another aspect of the present invention, an aircraft engine is provided, which includes the above-mentioned particle separator inner wall assembly anti-icing system.

[0018] The present invention has the following beneficial effects:

[0019] The anti-icing system of the particle separator inner wall assembly of the present invention comprises a front outer wall, a rear outer wall, an inner wall, a front mounting edge and a rear mounting edge which are enclosed to form an anti-icing interlayer through which hot air passes. The front outer wall is partially concave to form a concave wall, and an impact hole connected to the anti-icing interlayer is provided on the concave wall. The exhaust baffle is then covered on the front outer wall, and the covering area includes the concave wall and appropriately extends toward the front outer wall at the rear end of the concave wall to enclose with the concave wall to form an exhaust cavity connected to the impact hole. At the same time, a preset distance is maintained with the front outer wall at the rear end of the concave wall to enclose to form an exhaust gap connected to the exhaust cavity, and then the exhaust baffle is passed through the front outer wall. By clearing the casing, the exhaust baffle, the front outer wall and the rear outer wall, an inner flow channel is formed which is connected to the exhaust gap and through which the mainstream gas can flow, so that the hot air flows through the anti-icing interlayer, the impact hole, the exhaust cavity and the exhaust gap in sequence through the rear mounting edge and is discharged into the inner flow channel. Under the action of the exhaust gap, the flow direction of the hot air discharged into the inner flow channel is consistent with the flow direction of the mainstream gas at the exhaust point or deviates to the outer side of the front outer wall at the rear end of the concave wall, which greatly reduces the interference of the hot air on the movement trajectory of the supercooled water droplets in the mainstream gas and reduces the mixing loss of the hot air and the mainstream gas. The exhaust area of ​​the front outer wall at the rear end of the concave wall is covered by an air film, which reduces the impact efficiency of supercooled water droplets in the exhaust area and reduces the anti-icing load of the exhaust area. When the anti-icing function is not turned on, the outlet of the exhaust gap is on the leeward side and will not be blocked by ice, which greatly improves the response speed of the hot air. In this solution, the concave wall is partially formed on the front outer wall and the exhaust baffle covers the front outer wall to form an exhaust cavity and an exhaust gap, so as to realize embedded exhaust. Compared with the existing open exhaust, the exhaust direction of the hot air avoids the mainstream gas as much as possible. On the basis of meeting the structure and function of the anti-icing system, the exhaust mixing loss and the interference of the exhaust on the movement trajectory of supercooled water droplets in the mainstream gas are greatly reduced, and the possibility of supercooled water droplets impacting and clearing the non-anti-icing area of ​​the casing under the interference of the exhaust is eliminated. A protective air film is formed in the exhaust area of ​​the front outer wall, which reduces the impact efficiency of supercooled water droplets and reduces the anti-icing load of the exhaust area. At the same time, the embedded exhaust port is not easily blocked by ice, which improves the anti-icing response rate. It is highly practical and suitable for wide promotion and application.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 A schematic diagram of the structure of an existing particle separator inner wall component anti-icing system;

[0023] Figure 2 A schematic diagram of the partial structure of an existing particle separator inner wall assembly anti-icing system;

[0024] Figure 3 is a schematic structural diagram of an inner wall assembly of a particle separator according to a preferred embodiment of the present invention;

[0025] Figure 4 2 is a schematic structural diagram of an anti-icing system for an inner wall assembly of a particle separator according to a preferred embodiment of the present invention;

[0026] Figure 5 It is a partial structural diagram of the anti-icing system of the particle separator inner wall assembly according to a preferred embodiment of the present invention.

[0027] Legend:

[0028] 1. Clear the casing; 2. Front outer wall; 21. Concave wall; 22. Impact hole; 3. Rear outer wall; 4. Inner wall; 5. Front mounting edge; 6. Rear mounting edge; 7. Exhaust baffle; 8. Exhaust support plate. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are 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.

[0030] Figure 1 A schematic diagram of the structure of an existing particle separator inner wall component anti-icing system; Figure 2 A schematic diagram of the partial structure of an existing particle separator inner wall assembly anti-icing system; Figure 3 is a schematic structural diagram of an inner wall assembly of a particle separator according to a preferred embodiment of the present invention; Figure 4 2 is a schematic structural diagram of an anti-icing system for an inner wall assembly of a particle separator according to a preferred embodiment of the present invention; Figure 5 It is a partial structural diagram of the anti-icing system of the particle separator inner wall assembly according to a preferred embodiment of the present invention.

[0031] like Figure 3 and Figure 5As shown, the anti-icing system of the particle separator inner wall assembly of this embodiment includes a cleaning casing 1, a front outer wall 2, a rear outer wall 3, an inner wall 4, a front mounting edge 5 connected to the front outer wall 2 and the inner wall 4 respectively, a rear mounting edge 6 connected to the rear outer wall 3 and the inner wall 4 respectively, and an anti-icing interlayer for hot air to flow through, which is formed by the front outer wall 2, the rear outer wall 3, the inner wall 4, the front mounting edge 5 and the rear mounting edge 6. It is characterized in that it also includes a concave wall 21 on the side of the front outer wall 2 close to the front mounting edge 5 and concave inwardly toward the front mounting edge 5. , an impact hole 22 opened on the concave wall 21 and connected to the anti-icing interlayer, and an exhaust baffle 7 attached to the front outer wall 2 at the front end of the concave wall 21 and maintaining a preset distance from the front outer wall 2 at the rear end of the concave wall 21. The exhaust baffle 7 and the concave wall 21 enclose an exhaust cavity connected to the impact hole 22. The preset distance between the exhaust baffle 7 and the front outer wall 2 at the rear end of the concave wall 21 is an exhaust gap connected to the exhaust cavity. The casing 1, the exhaust baffle 7, the front outer wall 2 and the rear outer wall 3 enclose an inner flow channel for mainstream gas flow that is connected to the exhaust gap.Specifically, in the anti-icing system of the particle separator inner wall assembly of the present invention, the front outer wall 2, the rear outer wall 3, the inner wall 4, the front mounting edge 5 and the rear mounting edge 6 are enclosed to form an anti-icing interlayer through which hot air passes, the front outer wall 2 is partially concave to form a concave wall 21, and an impact hole 22 connected to the anti-icing interlayer is opened on the concave wall 21, and then the exhaust baffle 7 is covered on the front outer wall 2, and the covering area includes the concave wall 21 and appropriately extends to the front outer wall 2 at the rear end of the concave wall 21 to enclose the concave wall 21 to form an exhaust cavity connected to the impact hole 22, while maintaining a preset distance with the front outer wall 2 at the rear end of the concave wall 21 to surround The exhaust gap connected to the exhaust cavity is formed, and then the inner flow channel connected to the exhaust gap and through which the mainstream gas can flow is formed by clearing the casing 1, the exhaust baffle 7, the front outer wall 2 and the rear outer wall 3, so that the hot air flows through the anti-icing interlayer, the impact hole 22, the exhaust cavity and the exhaust gap in sequence through the rear mounting edge 6 and is discharged into the inner flow channel. Under the action of the exhaust gap, the flow direction of the hot air discharged into the inner flow channel is consistent with the flow direction of the mainstream gas at the exhaust point or deviates to the outer side of the front outer wall 2 at the rear end of the concave wall 21, which greatly reduces the interference of the hot air on the movement trajectory of the supercooled water droplets in the mainstream gas, and The mixing loss of hot air and mainstream gas is reduced, and the kinetic energy of the hot air is fully utilized. The exhaust area of ​​the front outer wall 2 at the rear end of the concave wall 21 is covered with an air film, which reduces the impact efficiency of supercooled water droplets in the exhaust area and reduces the anti-icing load of the exhaust area. When the anti-icing function is not turned on, since the outlet of the exhaust gap is on the leeward side, it will not be blocked by ice, which greatly improves the response speed of the hot air. In this solution, the exhaust cavity and the exhaust gap are formed by partially forming the concave wall 2 and the exhaust baffle 7 covering the front outer wall 2 to realize buried exhaust. Compared with the existing Some open exhaust systems allow the exhaust direction of hot air to avoid the mainstream gas as much as possible. On the basis of meeting the structure and function of the anti-icing system, it greatly reduces the exhaust mixing loss and the interference of the exhaust on the movement trajectory of supercooled water droplets in the mainstream gas, eliminating the possibility of supercooled water droplets impacting and clearing the non-anti-icing area of ​​the casing 1 under the interference of the exhaust. In addition, a protective air film is formed in the exhaust area of ​​the front outer wall 2, which reduces the impact efficiency of supercooled water droplets and reduces the anti-icing load of the exhaust area. At the same time, the buried exhaust port is not easily blocked by ice, which improves the anti-icing response rate, is highly practical, and is suitable for wide promotion and application. Optionally, the front mounting edge 5 is connected to the front outer wall 2 and the inner wall 4 respectively by welding or riveting. Optionally, the exhaust baffle 7 is connected to the front outer wall 2 at the front end of the recessed wall 21 by welding or riveting. Optionally, the rear mounting edge 6 is connected to the rear outer wall 3 and the inner wall 4 respectively by welding or riveting. It should be understood that the anti-icing of the middle end of the exhaust baffle 7 (the area corresponding to the concave wall 21) is mainly achieved by the impact heating of the hot air discharged through the impact hole 22, the anti-icing of the exhaust baffle 7 at the rear end of the concave wall 21 is mainly achieved by the flow heat exchange of hot air in the exhaust gap, and the anti-icing of the exhaust baffle 7 at the front end of the concave wall 21 (the part connected to the front outer wall 2 at the front end of the concave wall 21) is mainly achieved by the heat conduction of hot air.It should be understood that the preset spacing determines the hot air flow area in the exhaust gap. Therefore, the preset spacing is selected based on the required flow area of ​​the exhaust gap. It should be understood that the front end of the concave wall 21 refers to the end of the concave wall 21 close to the mainstream gas inlet, and the rear end of the concave wall 21 refers to the end of the concave wall 21 away from the mainstream gas inlet.

[0032] In this embodiment, the flow area of ​​the exhaust gap is not less than the total flow area of ​​all the impact holes 22 on the concave wall 21 . When the flow area of ​​the exhaust gap is smaller than the combined flow area of ​​all the impact holes 22 on the concave wall 21 , the velocity of hot air discharged through the impact holes 22 is limited by the exhaust gap and slowed, potentially failing to meet the anti-icing requirements of the exhaust baffle 7 . Therefore, the flow area of ​​the exhaust gap is larger than the combined flow area of ​​all the impact holes 22 on the concave wall 21 to ensure the flow velocity of the hot air discharged through the impact holes 22 . Furthermore, in actual use, the anti-icing effect is improved by increasing the flow rate of hot air. However, in manufacturing, the size of the exhaust gap is interrelated with other components, such as the exhaust baffle 7 . Enlarging the exhaust gap often affects the manufacturing of other components, while enlarging the impact holes 22 does not. In other words, enlarging the impact holes 22 is more appropriate. Therefore, the flow area of ​​the exhaust gap is larger than the combined flow area of ​​all the impact holes 22 on the concave wall 21 to ensure sufficient room for the impact holes 22 to expand, thereby increasing the flow rate of hot air. Furthermore, the manufacturing precision of the holes is higher than that of the exhaust gap, making it easier to precisely control the flow rate of hot air.

[0033] In this embodiment, the front outer wall 2 is made of metal, while the rear outer wall 3 and inner wall 4 are made of composite materials. Specifically, metal has a higher thermal conductivity than composite materials, but is heavier. Because the front outer wall 2 is located at the entrance of the mainstream airflow, the anti-icing load is relatively large, and anti-icing of the front outer wall 2 at the front end of the recessed wall 21 is primarily achieved through thermal conduction. Therefore, the front outer wall 2 is made of metal to achieve a higher thermal conductivity and provide anti-icing during the flow of hot air. The anti-icing load of the rear outer wall 3 and inner wall 4 is relatively small. Therefore, the rear outer wall 3 and inner wall 4 are made of composite materials to achieve a lower thermal conductivity. While achieving anti-icing, it also prevents heat loss, reduces the weight of the particle separator, and enhances overall performance. Optionally, the exhaust baffle 7 is made of metal. It should be understood that the specific selection of metal materials is well known to those skilled in the art and will not be elaborated on here. It should be understood that the specific selection of composite materials is well known to those skilled in the art and will not be elaborated on here.

[0034] like Figure 5As shown, in this embodiment, the outer slope of the front outer wall 2 at the rear end of the concave wall 21 is consistent with the inner slope of the exhaust baffle 7 at the rear end of the concave wall 21. Specifically, because the outer slope of the front outer wall 2 at the rear end of the concave wall 21 and the inner slope of the exhaust baffle 7 at the rear end of the concave wall 21 are consistent, the flow direction of the hot air discharged from the exhaust gap is consistent with the flow direction of the mainstream gas, thereby reducing exhaust mixing losses and interference with the trajectory of supercooled water droplets in the mainstream gas. At the same time, an air film is formed in the exhaust area of ​​the front outer wall 2, reducing the impact efficiency of supercooled water droplets and alleviating the anti-icing load.

[0035] In this embodiment, the exhaust baffle 7 at the rear end of the concave wall 21 is curved toward the front outer wall 2 at the rear end of the concave wall 21. Specifically, by curving the exhaust baffle 7 at the rear end of the concave wall 21 toward the front outer wall 2 at the rear end of the concave wall 21, the flow direction of the hot air discharged from the exhaust gap deviates from the flow direction of the mainstream gas, thereby reducing exhaust mixing losses and interference with the trajectory of supercooled water droplets in the mainstream gas. At the same time, the discharged hot air directly impacts the front outer wall 2, enhancing the anti-icing effect of the front outer wall 2.

[0036] like Figure 5 As shown, in this embodiment, the concave wall 21 includes a first wall surface located near the front outer wall 2 at the front end of the concave wall 21, a second wall surface located near the front outer wall 2 at the rear end of the concave wall 21, and a third wall surface located between the first and second wall surfaces. The impact holes 22 are located on the third wall surface. Specifically, hot air is discharged into the exhaust chamber through the impact holes 22 on the third wall surface, and then discharged into the inner flow channel through the exhaust gap. Optionally, the slope of the third wall surface is consistent with the slope of the exhaust baffle 7. Optionally, the outer surface of the second wall surface and the inner surface of the exhaust baffle 7 form a meridional convergence flow channel to increase the exhaust velocity. It should be understood that since the first wall surface is located near the front outer wall 2 at the front end of the concave wall 21 and correspondingly near the exhaust baffle 7 at the front end of the concave wall 21, to enhance the anti-icing effect of the front outer wall 2 and the exhaust baffle 7 at the front end of the concave wall 21, the axial distance between the first wall surface should be minimized to promote the impact holes 22 on the third wall surface to face forward, thereby enhancing the anti-icing effect.

[0037] like Figure 5 As shown, in this embodiment, exhaust support plates 8 are arranged within the exhaust gap, connected to the exhaust baffle 7 at the rear end of the concave wall 21 and the front outer wall 2 at the rear end of the concave wall 21, respectively. Multiple exhaust support plates 8 are arranged circumferentially at intervals. Specifically, the exhaust baffle 7 is supported by multiple exhaust support plates 8 to form the exhaust gap, with the predetermined spacing equal to the circumferential length of the exhaust support plates 8. Optionally, the circumferential cross-section of the exhaust support plates 8 can be an airfoil, an airfoil-like shape, or a narrow rectangular shape.

[0038] like Figure 5As shown, in this embodiment, a plurality of impact holes 22 are provided along the circumference of the concave wall 21, and multiple rows of impact holes 22 are provided along the axial direction of the concave wall 21. Specifically, the multiple impact holes 22 and the multiple rows of impact holes 22 are evenly distributed to increase the exhaust flow rate of hot air, thereby enhancing the anti-icing effect on the exhaust baffle 7.

[0039] In this embodiment, the ratio of the length to the diameter of the impact hole 22 is in the range of 0.5-1.5; and / or the diameter of the impact hole 22 is in the range of 0.6-1.6 mm; and / or the exhaust baffle 7 maintains an impact spacing with the concave wall 21, and the ratio of the impact spacing to the diameter of the impact hole 22 is in the range of 1-4; and / or the ratio of the spacing between two adjacent impact holes 22 in the circumferential direction to the ratio of the impact holes 22 is in the range of 3-10. Specifically, when the ratio of the length to the diameter of the impact hole 22 is in the range of 0.5-1.5, the anti-icing effect is relatively good; when the diameter of the impact hole 22 is in the range of 0.6-1.6 mm, the anti-icing effect is relatively good; when the exhaust baffle 7 maintains an impact spacing with the concave wall 21, and the ratio of the impact spacing to the diameter of the impact hole 22 is in the range of 1-4, the anti-icing effect is relatively good; and when the ratio of the spacing between two adjacent impact holes 22 in the circumferential direction to the ratio of the impact holes 22 is in the range of 3-10, the anti-icing effect is relatively good. It should be understood that the spacing between two adjacent impact holes 22 in the axial direction should be determined according to the impact amount of the supercooled water droplets in the impact area on the exhaust baffle 7, that is, the more the impact amount of the supercooled water droplets in the corresponding impact area, the smaller the spacing, and the smaller the impact amount of the supercooled water droplets in the corresponding impact area, the larger the spacing.

[0040] In this embodiment, an anti-icing structure is provided at the middle and rear ends of the scavenger case 1. The extended normal line of the exhaust baffle 7 at the rear end of the concave wall 21 intersects the inner flow path profile of the scavenger case 1, with the intersection being located at the middle or rear end of the scavenger case 1. Specifically, because the extended normal line of the exhaust baffle 7 at the rear end of the concave wall 21 intersects the inner flow path profile of the scavenger case 1, with the intersection being located at the middle or rear end of the scavenger case 1, when hot air discharged from the exhaust gap impacts the mainstream air, supercooled water droplets in the mainstream air can only impact the middle or rear end of the scavenger case 1. The middle or rear end of the scavenger case 1 is protected by the anti-icing structure, preventing localized failure of the anti-icing system. Optionally, the anti-icing structure includes a flow layer formed by the outer and inner walls of the scavenger case 1, through which the hot air flows, flowing through the flow layer and passing through the middle and rear ends of the scavenger case 1. It should be understood that the extension direction of the normal line of the exhaust baffle 7 is the same as the exhaust direction of the hot air.

[0041] The aircraft engine of this embodiment includes the aforementioned particle separator inner wall assembly anti-icing system. Specifically, the aircraft engine utilizes the aforementioned particle separator inner wall assembly anti-icing system to prevent local anti-icing failure of the particle separator inner wall assembly while simultaneously achieving anti-icing of the particle separator inner wall assembly. This reduces mixing losses between hot air and mainstream gas, and further enhances the anti-icing effect in the exhaust region of the front outer wall 2.

[0042] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An anti-icing system for an inner wall assembly of a particle separator, comprising a cleaning casing (1), a front outer wall (2), a rear outer wall (3), an inner wall (4), a front mounting edge (5) connected to the front outer wall (2) and the inner wall (4), respectively, a rear mounting edge (6) connected to the rear outer wall (3) and the inner wall (4), respectively, and an anti-icing interlayer for hot air to flow through formed by the front outer wall (2), the rear outer wall (3), the inner wall (4), the front mounting edge (5) and the rear mounting edge (6), characterized in that: It also includes a concave wall (21) located on a side of the front outer wall (2) close to the front mounting edge (5) and concave inwardly toward the front mounting edge (5), an impact hole (22) opened on the concave wall (21) and connected to the anti-icing interlayer, and an exhaust baffle (7) attached to the front outer wall (2) at the front end of the concave wall (21) and maintaining a preset distance from the front outer wall (2) at the rear end of the concave wall (21), the exhaust baffle (7) and the concave wall (21) enclose an exhaust cavity connected to the impact hole (22), the preset distance between the exhaust baffle (7) and the front outer wall (2) at the rear end of the concave wall (21) is an exhaust gap connected to the exhaust cavity, and the scavenger casing (1), the exhaust baffle (7), the front outer wall (2) and the rear outer wall (3) enclose an inner flow channel for the flow of mainstream gas connected to the exhaust gap; The concave wall (21) comprises a first wall surface arranged on the front outer wall (2) near the front end of the concave wall (21), a second wall surface arranged on the front outer wall (2) near the rear end of the concave wall (21), and a third wall surface arranged between the first wall surface and the second wall surface, and the impact hole (22) is arranged on the third wall surface; The outer surface of the second wall and the inner surface of the exhaust baffle (7) form a meridian contraction flow channel.

2. The particle separator inner wall component anti-icing system according to claim 1, characterized in that: The flow area of ​​the exhaust gap is not less than the total flow area of ​​all the impact holes (22) on the concave wall (21).

3. The particle separator inner wall component anti-icing system according to claim 1, characterized in that: The outer slope of the front outer wall (2) at the rear end of the concave wall (21) and the inner slope of the exhaust baffle (7) at the rear end of the concave wall (21) are consistent.

4. The particle separator inner wall assembly anti-icing system according to claim 1, characterized in that: The exhaust baffle (7) at the rear end of the concave wall (21) is bent and arranged in a direction close to the front outer wall (2) at the rear end of the concave wall (21).

5. The particle separator inner wall component anti-icing system according to any one of claims 1 to 4, characterized in that: An exhaust support plate (8) is arranged in the exhaust gap and is connected to the exhaust baffle (7) at the rear end of the concave wall (21) and the front outer wall (2) at the rear end of the concave wall (21). A plurality of exhaust support plates (8) are arranged at intervals along the circumferential direction.

6. The particle separator inner wall component anti-icing system according to any one of claims 1 to 4, characterized in that: A plurality of impact holes (22) are provided along the circumference of the concave wall (21), and a plurality of rows of impact holes (22) are provided along the axial direction of the concave wall (21).

7. The particle separator inner wall assembly anti-icing system according to claim 6, characterized in that: The ratio of the hole length to the hole diameter of the impact hole (22) is in the range of 0.5-1.5; and / or The impact hole (22) has a diameter ranging from 0.6 to 1.6 mm; and / or The exhaust baffle (7) and the concave wall (21) maintain an impact distance, and the ratio of the impact distance to the diameter of the impact hole (22) ranges from 1 to 4; and / or The ratio of the spacing between two adjacent impact holes (22) in the circumferential direction to the impact holes (22) is in the range of 3-10.

8. The particle separator inner wall assembly anti-icing system according to any one of claims 1 to 4, characterized in that: The middle and rear ends of the cleaning case (1) are provided with anti-icing structures, and the normal extension line of the exhaust baffle (7) at the rear end of the concave wall (21) intersects with the inner flow channel profile line of the cleaning case (1), and the intersection point is located at the middle or rear end of the cleaning case (1).

9. An aircraft engine, characterized in that: The invention comprises an anti-icing system for an inner wall assembly of a particle separator according to any one of claims 1 to 8.

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