Air inlet channel and aero-engine

Abstract

The utility model discloses an air inlet channel and an aero-engine. An air inlet channel comprises a lip, an inner wall plate, an outer wall plate, a front partition frame, a rear partition frame and an anti-icing system, the anti-icing system comprises an anti-icing air guiding pipe, the anti-icing air guiding pipe is connected with the lip, fixed to the rear partition frame through a flange connecting piece and connected with a fan cabin after penetrating through the rear partition frame, and the rear partition frame is of a honeycomb sandwich structure. Comprising a front wall layer away from the fan cabin, a rear wall layer adjacent to the fan cabin, and a core layer between the front wall layer and the rear wall layer, the rear wall layer comprises an air guide hole used for guiding cooling air flow from the fan cabin into the rear bulkhead, the core layer comprises a cooling hole used for guiding the cooling air flow to flow in the rear bulkhead, and the front wall layer comprises an exhaust hole used for guiding the cooling air flow to flow in the rear bulkhead. The exhaust hole is used for exhausting cooling airflow out of the rear partition frame and guiding the cooling airflow into a front and rear partition frame cavity formed by the front partition frame, the rear partition frame, the inner wall plate and the outer wall plate, the outer wall plate comprises an exhaust device, and the exhaust device is used for exhausting the cooling airflow out of the front and rear partition frame cavity.

Description

Technical Field

[0001] The utility model relates to the field of aeroengine nacelles, in particular to an air inlet and an aeroengine. Background Art

[0002] The aircraft engine nacelle is mainly used to fix the engine on the aircraft, optimize the engine aerodynamic flow field and protect the engine from external damage. The engine nacelle is mainly composed of the air inlet, fan compartment and other components. The air inlet is the front-end component of the engine, which is mainly used to shape the external airflow introduced through the air inlet lip and guide the rectified airflow into the engine through the fan blades. The air inlet is mainly composed of the lip, inner wall panel, outer wall panel, front bulkhead, rear bulkhead, anti-icing system and other components, and is connected to the fan compartment through the rear bulkhead.

[0003] Since the surface of the air inlet lip is prone to ice formation when the aircraft is flying at a relatively low temperature, an anti-icing system is usually set in the air inlet to prevent the lip from ice formation, so as to introduce anti-icing hot air into the lip. The anti-icing system draws air from the engine core cabin through the anti-icing air duct, passes through the fan cabin, the front and rear bulkhead cavities, and finally introduces the hot air into the lip to realize the anti-icing function of the nacelle. The front and rear bulkhead cavities are composed of the front bulkhead, the rear bulkhead, the inner wall plate, and the outer wall plate. The rear bulkhead and the inner and outer wall plates are both honeycomb sandwich composite structures, which are a laminated composite structure with a lightweight core material sandwiched between two thin skins, and the limited use temperature of this structure is relatively low. Since the anti-icing air duct in the anti-icing system is fixed to the rear bulkhead through a flange connector, its high-temperature wall surface transfers heat to the rear bulkhead through heat conduction, and the anti-icing air duct transfers heat to the front and rear bulkhead cavities through thermal radiation to heat the inner and outer wall plates, thereby causing the temperature of the rear bulkhead and the inner and outer wall plates to exceed their limited use temperature.

[0004] Therefore, in order to prevent the composite structure of the rear bulkhead and inner and outer wall panels from overheating, or to reduce the outer surface temperature of the anti-icing system, it is necessary to cool the local high temperature area of ​​the rear bulkhead, the front and rear bulkhead cavities, and the outer surface of the anti-icing system. Utility Model Content

[0005] It should be understood that the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention as claimed.

[0006] According to one aspect of the utility model, an air inlet is provided, comprising a lip, an inner wall panel, an outer wall panel, a front bulkhead, a rear bulkhead and an anti-icing system, wherein the anti-icing system comprises an anti-icing air duct, wherein the anti-icing air duct is connected to the lip, fixed to the rear bulkhead by a flange connector, and passes through the rear bulkhead, wherein the rear bulkhead is connected to a fan compartment, wherein the rear bulkhead is a honeycomb sandwich structure, comprising a front wall layer away from the fan compartment, a rear wall layer adjacent to the fan compartment, and a core layer between the front wall layer and the rear wall layer, wherein the rear wall layer comprises an air duct hole, wherein the air duct hole is arranged on the outside of the anti-icing air duct and is not connected to the flange connector of the anti-icing system for fixing relative to the rear wall layer. The connecting holes overlap, the air inlet holes are used to introduce the cooling airflow from the fan compartment into the rear bulkhead, the core layer includes cooling holes, the cooling holes are located on the side walls of the honeycomb core grid of the core layer, and are used to guide the cooling airflow to flow in the rear bulkhead, the front wall layer includes exhaust holes, the exhaust holes are arranged on the outside of the anti-icing system and do not overlap with the flange connection holes of the anti-icing system for fixing relative to the front wall layer, the exhaust holes are used to discharge the cooling airflow from the rear bulkhead and guide it into the front and rear bulkhead cavities formed by the front bulkhead, the rear bulkhead, the inner wall panels and the outer wall panels, and the outer wall panels include exhaust devices, the exhaust devices are used to discharge the cooling airflow from the front and rear bulkhead cavities.

[0007] In the above-mentioned air inlet duct, the air inlet hole is closer to the axis of the anti-icing system than the air outlet hole.

[0008] In the above-mentioned air inlet duct, the outflow direction of the exhaust hole is inclined toward the anti-icing system.

[0009] In the above-mentioned air inlet, a single air intake hole or a single exhaust hole is inside a single honeycomb core cell.

[0010] In the above-mentioned air inlet duct, the cooling holes on the opposite side walls of the honeycomb core cells of the core layer do not completely overlap with each other.

[0011] In the above-mentioned air intake duct, the total effective air intake area of ​​all the air intake holes of the rear bulkhead is greater than or equal to the effective area of ​​the air intake device of the fan compartment.

[0012] In the above-mentioned air inlet duct, the total effective flow area of ​​all cooling holes of a single honeycomb core cell of the rear bulkhead is greater than or equal to the total effective air inlet area of ​​the single honeycomb core cell.

[0013] In the above-mentioned air intake duct, the total effective exhaust area of ​​all the exhaust holes of the rear bulkhead is greater than or equal to the total effective air intake area of ​​all the air intake holes of the rear bulkhead.

[0014] In the above-mentioned air intake duct, the exhaust device is arranged close to the front bulkhead.

[0015] In the above-mentioned air intake duct, the effective exhaust area of ​​the exhaust device is greater than or equal to the total effective exhaust area of ​​all the exhaust holes of the rear bulkhead.

[0016] In the above-mentioned air inlet, the anti-icing system further includes an outer sleeve or an insulation blanket outside the anti-icing air duct.

[0017] The rear bulkhead in the above-mentioned air inlet duct can introduce the cooling airflow of the fan compartment into the rear bulkhead, perform internal cooling on the local over-temperature area of ​​the rear bulkhead, and then discharge it into the front and rear bulkhead cavities of the air inlet duct through the exhaust holes on the rear bulkhead frame, thereby cooling the high-temperature hot surfaces in the cavity, especially the outer surface of the anti-icing system, to avoid shortening or failure of the fatigue life of the rear bulkhead and inner and outer wall panel structures due to excessive temperature.

[0018] According to another aspect of the utility model, an aircraft engine is provided, comprising the above-mentioned air inlet duct.

[0019] The rear bulkhead in the air inlet used by the above-mentioned aircraft engine can introduce the cooling airflow of the fan compartment into the rear bulkhead, perform internal cooling on the local over-temperature area of ​​the rear bulkhead, and then discharge the air into the front and rear bulkhead cavities of the air inlet through the exhaust holes on the rear bulkhead, thereby cooling the high-temperature hot surfaces in the cavity, especially the outer surface of the anti-icing system, to avoid shortening or failure of the fatigue life of the rear bulkhead and inner and outer wall panel structures due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present invention, and they are included and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with this specification serve to explain the principles of the present invention. In the accompanying drawings:

[0021] Figure 1 is a cross-sectional schematic diagram of an engine nacelle according to an embodiment;

[0022] Figure 2 is a cross-sectional schematic diagram of the front and rear bulkhead cavities of the air inlet according to an embodiment;

[0023] Figure 3 is a schematic diagram of an air duct according to an embodiment;

[0024] Figure 4 is a schematic diagram of a cooling hole according to an embodiment;

[0025] Figure 5A is a schematic diagram of an exhaust hole according to an embodiment;

[0026] Figure 5B Schematic diagram of the outflow direction of the exhaust hole according to an embodiment. DETAILED DESCRIPTION

[0027] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto but only by the claims. In the accompanying drawings, for illustrative purposes, the sizes of some of the elements may be enlarged and not drawn to scale. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts.

[0028] Although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning contained in each term.

[0029] In the description provided herein, numerous specific details are set forth. However, it should be understood that embodiments of the present invention may be practiced without these specific details. In other examples, well-known methods, structures, and techniques are not shown in detail to avoid confusing the understanding of the present invention.

[0030] Figure 1 It is a cross-sectional schematic diagram of an engine nacelle according to an embodiment. The nacelle air inlet includes a lip 10, an inner wall panel 6, an outer wall panel 2, a front bulkhead 9, and a rear bulkhead 5, wherein the front bulkhead 9, the rear bulkhead 5, the inner wall panel 6, and the outer wall panel 2 constitute the front and rear bulkhead cavities of the air inlet, and the rear bulkhead 5 is connected to the fan compartment. The air inlet also includes an anti-icing system, which includes an anti-icing air duct 8. The anti-icing air duct 8 is connected to the lip 10, fixed to the rear bulkhead 5 through the flange connector of the rear flange of the anti-icing air duct, and passes through the rear bulkhead 5, and is finally connected to the engine core cabin to introduce anti-icing hot air from the core cabin into the lip 10. In one embodiment, the anti-icing system further includes an outer sleeve 7, which is outside the anti-icing air duct 8 and fixed to the rear bulkhead 5 through a flange connector. The outer sleeve 7 is used to prevent the anti-icing hot air from diffusing in the front and rear bulkhead cavities after the anti-icing pipeline bursts and the jet impact heat exchange on the composite wall panels, causing the structure to fail due to high temperature. Although Figure 1 An outer sleeve 7 is shown, but the anti-icing system according to the embodiment of the present application does not necessarily include an outer sleeve. For example, in one embodiment, the anti-icing system further includes an insulation blanket (not shown), which is wrapped around the outside of the anti-icing air duct 8 to prevent the heat of the anti-icing pipeline from diffusing in the front and rear bulkhead cavities. An air intake device 4 is provided on the fan cover 3 of the nacelle fan compartment to introduce external cooling airflow into the fan compartment. The cooling airflow direction is shown by the arrow to ventilate and cool the fan compartment.

[0031] Since the rear bulkhead 5 is a honeycomb sandwich composite material structure, which is a laminated composite structure with a lightweight core material sandwiched between two thin skins, its limited use temperature is relatively low, while the anti-icing air duct 8 and the flange are subjected to high temperatures due to the heat convection heat transfer of the high-temperature bleed air in the tube. Since the flange is in direct contact with the rear bulkhead 5, the flange transfers heat to the rear bulkhead 5 through heat conduction, causing the temperature of the rear bulkhead to exceed its limited use temperature. Therefore, it is necessary to cool the rear bulkhead 5 of the air inlet to prevent it from having local over-temperature and affecting the structural reliability. In addition, since the anti-icing air duct 8 transfers heat to the front and rear bulkhead cavities through thermal radiation to heat the inner wall panels 6 and the outer wall panels 2, thereby causing the temperature of the inner and outer wall panels to exceed their limited use temperature, it is necessary to cool the outer surface of the anti-icing system and the inner and outer wall panels to prevent the temperature from exceeding the limited use temperature.

[0032] To this end, the utility model provides a cooling device for the front and rear bulkhead cavities of the engine nacelle, which introduces the cooling airflow of the nacelle fan compartment into the honeycomb sandwich structure of the rear bulkhead 5, cools the honeycomb sandwich structure by the flow of the cooling airflow inside the honeycomb core of the rear bulkhead 5, and further introduces the cooling airflow into the front and rear bulkhead cavities to cool the cavity structure and the outer surface of the anti-icing system, and the cooling airflow direction is shown by the arrow. In addition, an exhaust device 1 is provided on the outer wall panel 2, and the exhaust device 1 is used to discharge the cooling airflow out of the front and rear bulkhead cavities. In one embodiment, the exhaust device 1 is arranged close to the front bulkhead 9 to make the convective heat exchange in the front and rear bulkhead cavities more sufficient.

[0033] Figure 2 1 is a cross-sectional schematic diagram of the front and rear bulkhead cavities of the air inlet according to an embodiment. The anti-icing air duct 8 is fixed to the rear bulkhead 5 through the flange connection of the rear flange 15 of the anti-icing air duct. In one embodiment, when the anti-icing system includes an outer sleeve 7 outside the anti-icing air duct 8, the outer sleeve 7 is fixed to the rear bulkhead 5 through the flange connection of the rear flange 14 of the outer sleeve. Figure 2The outer sleeve 7 and the outer sleeve rear flange 14 are shown, but the anti-icing system according to the embodiment of the present application does not necessarily include an outer sleeve. For example, in one embodiment, the anti-icing system further includes an insulation blanket (not shown), which is wrapped around the outside of the anti-icing air duct 8. The rear bulkhead 5 is a honeycomb sandwich structure, including a front wall layer away from the fan compartment, a rear wall layer adjacent to the fan compartment, and a core layer between the front wall layer and the rear wall layer. The rear wall layer includes air bleed holes 11, which are used to introduce cooling airflow from the fan compartment into the rear bulkhead 5. The core layer includes cooling holes 12, which are located on the side walls of the honeycomb core grid of the core layer, and are used to guide the cooling airflow to flow in the rear bulkhead 5 to cool the rear bulkhead 5. The front wall layer includes exhaust holes 13, which are used to discharge cooling airflow out of the rear bulkhead 5 and guide it into the front and rear bulkhead cavities formed by the front bulkhead, the rear bulkhead, the inner wall panel and the outer wall panel, so as to cool the structures in the front and rear bulkhead cavities (for example, the outer surface of the anti-icing system, the outer wall panel, the inner wall panel, etc.). The direction of the cooling airflow is indicated by the arrow.

[0034] Figure 3 Schematic diagram of the air intake hole 11 according to one embodiment. The air intake hole 11 is arranged in the rear wall layer of the rear bulkhead. Figure 3 The large circle in the figure represents the hole through which the anti-icing air duct 8 passes through the rear bulkhead. The air duct hole 11 is arranged on the outside of the anti-icing air duct 8 and does not overlap with the flange connection hole of the anti-icing system (for example, the anti-icing air duct, the outer sleeve, etc.) for fixing relative to the rear wall layer. The air duct hole 11 is used to introduce the cooling airflow from the fan compartment into the rear bulkhead. In one embodiment, when the anti-icing system is fixed to the rear wall layer of the rear bulkhead by a flange connection, the air duct hole 11 does not overlap with the flange connection hole. In one embodiment, when the anti-icing system is fixed to the rear wall layer of the rear bulkhead by a flange connection penetrating the rear bulkhead, the air duct hole 11 does not overlap with the flange connection hole. The shape of the air duct hole 11 can be circular, elliptical, rectangular, etc., and is not limited to Figure 3 The shape shown. Any number of air bleed holes 11 can be set in a single honeycomb core cell, and any number of air bleed holes 11 can be set in the rear wall layer. In one embodiment, a single air bleed hole 11 is inside a single honeycomb core cell and is not arranged across the core cell. In one embodiment, the total effective air bleed area of ​​all the air bleed holes 11 of the rear bulkhead is greater than or equal to the effective area of ​​the air intake device of the fan compartment.

[0035] Figure 4 1 is a schematic diagram of a cooling hole 12 according to an embodiment. The cooling hole 12 is arranged on the side wall of the honeycomb core cell of the core layer, and is used to guide the cooling airflow to flow in the rear bulkhead. The shape of the cooling hole 12 can be circular, elliptical, rectangular, etc., but is not limited to Figure 4The shape shown. Any number of cooling holes can be set in a single honeycomb core cell, and any number of cooling holes can be set in the core layer. In one embodiment, the cooling holes 12 on the opposite side walls of the honeycomb core cell of the core layer do not completely overlap with each other, so that the cooling airflow can fully exchange heat with the surface of the honeycomb core cell. In one embodiment, the total effective flow area of ​​all cooling holes in a single honeycomb core cell is greater than or equal to the total effective air intake area of ​​the honeycomb core cell. When the rear wall layer corresponding to a single honeycomb core cell is provided with air ducting holes, the total effective air intake area of ​​the honeycomb core cell is the total effective air intake area of ​​all air ducting holes of the honeycomb core cell. When the rear wall layer corresponding to a single honeycomb core cell is not provided with air ducting holes, the total effective air intake area of ​​the honeycomb core cell is zero.

[0036] Figure 5A 1 is a schematic diagram of an exhaust hole 13 according to an embodiment. The exhaust hole 13 is arranged in the front wall layer of the rear bulkhead. Figure 5A The large circle in the figure represents the hole through which the anti-icing air duct 8 passes through the rear bulkhead. The exhaust hole 13 is arranged on the outside of the anti-icing system and does not overlap with the flange connection hole of the anti-icing system (for example, the anti-icing air duct, the outer sleeve, etc.) for fixing relative to the front wall layer. The exhaust hole 13 is used to discharge the cooling airflow out of the rear bulkhead and guide it into the front and rear bulkhead cavities. In one embodiment, when the anti-icing system is fixed to the front wall layer of the rear bulkhead by a flange connection, the exhaust hole 13 does not overlap with the flange connection hole. In one embodiment, when the anti-icing system is fixed to the front wall layer of the rear bulkhead by a flange connection penetrating the rear bulkhead, the exhaust hole 13 does not overlap with the flange connection hole. The cooling airflow guided into the front and rear bulkhead cavities can be used to cool the inner wall panels, outer wall panels, and the outer surface of the cooling system. In one embodiment, when the anti-icing system includes an outer sleeve disposed on the outside of the anti-icing air duct 8, the exhaust hole 13 is disposed on the outside of the outer sleeve and does not overlap with the flange connection hole of the anti-icing system (e.g., the anti-icing air duct, the outer sleeve) for fixing relative to the front wall layer, and is used to discharge the cooling airflow out of the rear bulkhead and guide it into the front and rear bulkhead cavities. In one embodiment, when the anti-icing system includes an insulation blanket disposed on the outside of the anti-icing air duct 8, the exhaust hole 13 is disposed on the outside of the insulation blanket and does not overlap with the flange connection hole of the anti-icing system (e.g., the anti-icing air duct) for fixing relative to the front wall layer, and is used to discharge the cooling airflow out of the rear bulkhead and guide it into the front and rear bulkhead cavities. The shape of the exhaust hole can be circular, elliptical, rectangular, etc., and is not limited to Figure 5A The shape shown. Any number of exhaust holes can be set in a single honeycomb core cell, and any number of exhaust holes can be set in the front wall layer. In one embodiment, a single exhaust hole is inside the honeycomb core cell and is not arranged across the core cell. In one embodiment, the total effective exhaust area of ​​all the exhaust holes of the rear bulkhead is greater than or equal to the total effective air intake area of ​​all the air intake holes of the rear bulkhead. In one embodiment, the effective exhaust area of ​​the exhaust device of the outer wall panel is greater than or equal to the total effective exhaust area of ​​all the exhaust holes of the rear bulkhead.

[0037] Figure 5B Schematic diagram of the outlet direction of the exhaust hole according to one embodiment. In one embodiment, the outlet direction of the exhaust hole is inclined toward the anti-icing system, so that the cooling airflow can fully contact and exchange heat with the outer surface of the anti-icing system, avoiding the cooling airflow from being directly discharged from the exhaust device on the outer wall panel. Figure 5B In the embodiment, the outlet direction of the exhaust hole is inclined toward the center of the anti-icing system compared with the axial direction of the bleed hole. In one embodiment, the bleed hole is closer to the axis of the anti-icing system than the exhaust hole to facilitate cooling of the flange of the anti-icing system.

[0038] The utility model introduces the ventilation cooling airflow of the fan compartment into the rear bulkhead of the air inlet duct, performs internal cooling on the local over-temperature area of ​​the honeycomb sandwich structure of the rear bulkhead frame, and then discharges the airflow into the front and rear bulkhead cavities of the air inlet duct through the exhaust holes on the honeycomb sandwich structure of the rear bulkhead frame, cools the high-temperature hot surfaces in the cavity, especially the outer surface of the anti-icing system, and the introduced cooling airflow is finally discharged into the atmosphere through the exhaust device provided on the outer wall panel of the air inlet duct.

[0039] By introducing the ventilation and cooling airflow of the fan compartment into the rear bulkhead and the front and rear bulkhead cavities of the nacelle air inlet, the utility model realizes the secondary utilization of the ventilation and cooling air of the fan compartment, and by sharing a set of air bleed and exhaust devices with the fan compartment, the economy of the structure is improved, and the failure rate increased by the increase in structure is reduced; by allowing the cooling airflow to flow inside the honeycomb sandwich structure of the rear bulkhead frame, the local over-temperature problem of the structure caused by the heat conduction of the high-temperature air bleed pipeline components of the anti-icing system is taken away, thereby avoiding the shortening of the fatigue life or failure of the rear bulkhead structure due to excessive temperature; by discharging the cooling airflow from the honeycomb sandwich structure of the rear bulkhead frame and then entering the front and rear bulkhead cavities of the air inlet, the convective heat exchange in the front and rear bulkhead cavities, especially near the anti-icing system, is strengthened, the temperature of the outer surface of the anti-icing system and the inner and outer wall panel structures is reduced, the structural thermal stress and the temperature reduction of the structural material performance are reduced, and the influence of high temperature on the structural life and structural safety is reduced.

[0040] References throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. Thus, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout this specification do not necessarily all refer to the same embodiment, but may refer to the same embodiment. Furthermore, in one or more embodiments, as will be apparent to one of ordinary skill in the art from this disclosure, the particular features, structures, or characteristics may be combined in any suitable manner.

[0041] Similarly, it should be appreciated that in the description of the exemplary embodiments of the present invention, for the purpose of streamlining the disclosure and assisting in the understanding of one or more of the various innovative aspects, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting the intention that the claimed utility model requires more features than the features explicitly recited in each claim. On the contrary, as reflected in the appended claims, the innovative aspects lie in fewer features than all the features of a single preceding disclosed embodiment. Therefore, the claims appended to the present invention are hereby expressly incorporated into this specific embodiment, wherein each claim itself represents a separate embodiment of the present invention.

[0042] In addition, although some embodiments described herein include some features included in other embodiments but do not include other features included in other embodiments, the combination of features of different embodiments is intended to fall within the scope of the present invention and form different embodiments as will be understood by those skilled in the art. For example, in the appended claims, any of the claimed embodiments may be used in any combination.

[0043] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. An air inlet, comprising a lip, an inner wall plate, an outer wall plate, a front bulkhead, a rear bulkhead and an anti-icing system, wherein the anti-icing system comprises an anti-icing air duct, the anti-icing air duct is connected to the lip, fixed to the rear bulkhead through a flange connector, and passes through the rear bulkhead, the rear bulkhead is connected to a fan compartment, and is characterized in that: The rear bulkhead is a honeycomb sandwich structure, comprising a front wall layer away from the fan compartment, a rear wall layer adjacent to the fan compartment, and a core layer between the front wall layer and the rear wall layer, wherein: The rear wall layer comprises an air bleed hole, which is arranged outside the anti-icing air bleed pipe and does not overlap with a flange connection hole of the anti-icing system for fixing relative to the rear wall layer, and the air bleed hole is used to introduce a cooling airflow from the fan compartment into the rear bulkhead, The core layer comprises cooling holes, which are located on the side walls of the honeycomb core cells of the core layer and are used to guide cooling airflow to flow in the rear bulkhead. The front wall layer includes an exhaust hole, which is arranged outside the anti-icing system and does not overlap with a flange connection hole of the anti-icing system for fixing relative to the front wall layer, and the exhaust hole is used to discharge the cooling airflow out of the rear bulkhead and guide it into the front and rear bulkhead cavities formed by the front bulkhead, the rear bulkhead, the inner wall panel and the outer wall panel, and The outer wall panel includes an exhaust device, which is used to exhaust the cooling airflow out of the front and rear bulkhead cavities.

2. The air intake duct according to claim 1, characterized in that: The air bleed hole is closer to the axis of the anti-icing system than the air exhaust hole.

3. The air intake duct according to claim 1, characterized in that: The outflow direction of the exhaust hole is inclined toward the anti-icing system.

4. The air intake duct according to claim 1, characterized in that A single air intake hole or a single exhaust hole is inside a single honeycomb core cell.

5. The air intake duct according to claim 1, characterized in that: The cooling holes on the opposite side walls of the honeycomb cells of the core layer do not completely overlap each other.

6. The air intake duct according to claim 1, characterized in that: The total effective air intake area of ​​all the air intake holes of the rear bulkhead is greater than or equal to the effective area of ​​the air intake device of the fan compartment.

7. The air intake duct according to claim 1, characterized in that: The total effective flow area of ​​all cooling holes of a single honeycomb core cell of the rear bulkhead is greater than or equal to the total effective air intake area of ​​the single honeycomb core cell.

8. The air intake duct according to claim 1, characterized in that: The total effective exhaust area of ​​all the exhaust holes of the rear bulkhead is greater than or equal to the total effective air intake area of ​​all the air intake holes of the rear bulkhead.

9. The air intake duct according to claim 1, characterized in that: The exhaust device is arranged close to the front bulkhead.

10. The air intake duct according to claim 1, characterized in that The effective exhaust area of ​​the exhaust device is greater than or equal to the total effective exhaust area of ​​all the exhaust holes of the rear bulkhead.

11. The air intake duct according to claim 1, characterized in that: The anti-icing system further includes an outer sleeve or an insulation blanket outside the anti-icing air duct.

12. An aircraft engine, characterized in that: Comprising the air inlet duct as claimed in any one of claims 1 to 11.

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