Air inlet cone with noise reduction effect and aero-engine comprising air inlet cone

Abstract

The invention provides an air inlet cone with a noise reduction effect and an aero-engine comprising the air inlet cone. An acoustic liner is laid on the surface of the air inlet cone, and the acoustic liner avoids the tip part of the air inlet cone; the acoustic liner comprises a perforated plate, at least one honeycomb interlayer and a back plate, the honeycomb interlayer is installed between the perforated plate and the back plate, and the back plate is fixed to the surface of the air inlet cone. On the premise that the appearance of the air inlet cone is guaranteed, the acoustic liner is arranged on the surface of the air inlet cone, meanwhile, the acoustic liner is arranged away from the tip part, the honeycomb laying space of the acoustic liner and the strength of the air inlet cone are guaranteed, and forward noise of a fan can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of noise reduction of aircraft engines, and in particular to an air intake cone with noise reduction effect and an aircraft engine comprising the same. Background Art

[0002] In the prior art, for high bypass ratio turbofan engines, fan noise is the main sound source. Noise reduction from the sound source can be achieved by adjusting parameters such as the number of fan blades, sweep angle, rotor-to-static distance, etc., or by achieving low noise design through gas dynamic shaping, such as low noise propeller wing design, and noise reduction solutions using additional parts such as trailing edge serrations.

[0003] From the perspective of transmission path, fan noise can be divided into forward-transmitted and backward-transmitted noise. Forward-transmitted noise is currently mainly reduced by laying acoustic lining on the fan casing and nacelle. Backward-transmitted noise is reduced by laying acoustic lining on the culvert casing. Usually, the acoustic lining is composed of perforated plates, honeycombs and back plates, with excellent noise reduction and vibration reduction performance and stable structure. The perforation rate and hole distribution of the perforated plates will affect the sound reduction performance. The larger the cavity of the honeycomb core, the higher the height, and the smaller the wall thickness, the better the sound reduction effect. Per unit length, the larger the area of ​​the acoustic lining, the better the sound absorption effect. Currently, acoustic linings are laid in static areas, such as casings.

[0004] However, the sound absorption band of the traditional single-degree-of-freedom perforated honeycomb acoustic lining is narrow.

[0005] Therefore, how to further reduce the noise level, develop fan inlet cone acoustic lining suitable for aircraft engines, increase the acoustic lining laying area, widen the sound absorption frequency band, and effectively improve the fan forward noise reduction has become a very important research field in this field.

[0006] In view of this, the inventor of the present application has designed an intake cone with noise reduction effect and an aircraft engine including the same, in order to overcome the above-mentioned technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the fan noise of an aircraft engine is too loud and the traditional noise reduction scheme is insufficient to suppress the fan forward noise, and to provide an air intake cone with noise reduction effect and an aircraft engine including the same.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] An air intake cone with noise reduction effect, used for an aircraft engine, characterized in that a sound lining is laid on the surface of the air intake cone, and the sound lining avoids the tip of the air intake cone;

[0010] The acoustic liner comprises a perforated plate, at least one honeycomb sandwich layer and a back plate, wherein the honeycomb sandwich layer is installed between the perforated plate and the back plate, and the back plate is fixed to the surface of the air intake cone.

[0011] According to one embodiment of the present invention, a metal wire mesh is provided on the outer surface of the perforated plate.

[0012] According to one embodiment of the present invention, the honeycomb interlayer is a single-layer honeycomb interlayer or a double-layer honeycomb interlayer.

[0013] According to one embodiment of the present invention, the honeycomb sandwich is manufactured by sintering TC4 powder using a selective laser melting additive manufacturing process.

[0014] According to one embodiment of the present invention, the honeycomb layer is manufactured by using a 3D printing process.

[0015] According to an embodiment of the present invention, an air intake cone metal substrate is used as the back plate.

[0016] According to one embodiment of the present invention, the honeycomb sandwich and the perforated plate are sequentially mounted on the air intake cone metal substrate.

[0017] According to an embodiment of the present invention, the acoustic liner is a detachable or integrated structure.

[0018] The present invention also provides an aircraft engine, which is characterized in that the aircraft engine includes an air intake cone and a fan with noise reduction effect as described above, and the air intake cone is connected to the inner flow channel of the fan.

[0019] The positive and progressive effects of the present invention are:

[0020] The invention discloses an air intake cone with noise reduction effect and an aero-engine comprising the same. Under the premise of ensuring the shape of the air intake cone, a sound liner is arranged on the surface of the air intake cone.

[0021] At the same time, the sound lining is arranged away from the tip, which not only ensures the honeycomb laying space and intake cone strength of the sound lining, but also effectively reduces the fan forward noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0023] Figure 1 It is a schematic diagram of the flow passage of the air intake cone with noise reduction effect of the present invention.

[0024] Figure 2 The figure is a schematic diagram of the structure of the acoustic liner in the air intake cone with noise reduction effect according to the present invention.

[0025] Figure 3 It is a surface schematic diagram of the air intake cone with noise reduction effect of the present invention.

[0026] Figure 4 The figure is a schematic diagram of the arrangement of a single-layer acoustic liner in an air intake cone having a noise reduction effect according to the present invention.

[0027] Figure 5 The figure is a schematic diagram of the arrangement of the double-layer acoustic liner in the air intake cone with noise reduction effect of the present invention.

[0028] Figure 6 The present invention is a schematic diagram of the detachable structure of the acoustic liner in the air intake cone with noise reduction effect.

[0029] Figure 7 The figure is a schematic diagram of the integrated structure of the sound liner in the air intake cone with noise reduction effect according to the present invention.

[0030] [Reference Signs]

[0031] Intake cone 10

[0032] Sound lining 20

[0033] Perforated plate 21

[0034] Honeycomb sandwich 22

[0035] Back panel 23

[0036] Wire Mesh 24

[0037] Fan 30 DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0040] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some 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 document.

[0041] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0042] Figure 1 It is a schematic diagram of the flow passage of the air intake cone with noise reduction effect of the present invention.

[0043] Figure 2 The figure is a schematic diagram of the structure of the acoustic liner in the air intake cone with noise reduction effect according to the present invention.

[0044] Figure 3 It is a surface schematic diagram of the air intake cone with noise reduction effect of the present invention.

[0045] like Figures 1 to 3 As shown, the present invention discloses an air intake cone with noise reduction effect, which is used for an aircraft engine. The surface of the air intake cone 10 is paved with an acoustic liner 20, and the acoustic liner 20 avoids the tip of the air intake cone 10.

[0046] The acoustic liner 20 includes a perforated plate 21, at least one honeycomb interlayer 22 and a back plate 23. The honeycomb interlayer 22 is installed between the perforated plate 21 and the back plate 23, and the back plate 23 is fixed to the surface of the air intake cone 10. According to specific sound source information, the acoustic liner structure can be designed, including the perforation rate, perforation method, honeycomb size and wall thickness.

[0047] Select the target sound source (usually fan rotation-static interference noise or fan shock wave noise), optimize the acoustic impedance of the sound lining according to the sound source mode and frequency, and design the sound lining structure based on the acoustic impedance model, and give design parameters such as perforation rate, perforation method, honeycomb size and wall thickness to meet the noise reduction requirements. The structural design has a higher noise reduction effect for the target sound source, and generally has broadband sound absorption characteristics.

[0048] Preferably, a metal mesh 24 is provided on the outer surface of the perforated plate 21. Since the air intake cone 10 is close to the air intake port, the provision of the metal mesh 24 can reduce dust ingress into the air intake cone, broaden the sound absorption band of the sound lining, and improve the low-frequency sound absorption coefficient.

[0049] The air intake cone with noise reduction effect is provided with an acoustic lining designed according to the target sound source on the surface of the air intake cone (designed as a single-degree-of-freedom or double-degree-of-freedom acoustic lining according to different sound sources, and the thickness / aperture / perforation rate of the perforated plate and the depth of the honeycomb cavity are acoustically designed), and a metal wire mesh is laid on the surface to improve the sound absorption effect. At the same time, the tip part is avoided, and two installation structures, detachable and integrated, can be formed according to the 3D printing process, achieving a very effective noise reduction effect.

[0050] The surface of the air intake cone with noise reduction effect is provided with an acoustic lining, and a specific noise reduction design is carried out, taking noise performance into consideration.

[0051] The structural design of the air intake cone itself, such as the streamline design, anti-icing design, etc., and the silent lining at the tip, take into account both aerodynamic performance and anti-bird strike / anti-icing needs.

[0052] Figure 4 The figure is a schematic diagram of the arrangement of a single-layer acoustic liner in an air intake cone having a noise reduction effect according to the present invention.

[0053] Figure 5 The figure is a schematic diagram of the arrangement of the double-layer acoustic liner in the air intake cone with noise reduction effect of the present invention.

[0054] like Figure 4 and Figure 5 As shown, the honeycomb sandwich 22 is preferably a single-layer honeycomb sandwich or a double-layer honeycomb sandwich. Considering the thickness of the air intake cone wall and the thickness of the sound liner, it is possible to consider arranging a single-layer or double-layer honeycomb (such as Figure 4 When arranging the acoustic liner 10, the tip portion is avoided, so that the honeycomb laying space and the air intake cone strength of the acoustic liner 20 can be ensured.

[0055] According to the target sound source frequency requirements, if single-frequency noise reduction is considered, a single-layer honeycomb is generally arranged. If multi-frequency noise reduction is considered, a double-degree-of-freedom sound liner can be used (which can be achieved through a double-layer honeycomb).

[0056] However, the double-layer honeycomb requires a deeper honeycomb cavity depth, and the honeycomb cavity depth range allowed by the air intake cone structure design needs to be considered. This structural design mainly depends on the target sound source requirements that need to be reduced noise and the limitations of the air intake cone structure design itself.

[0057] The structure is a honeycomb with a large number of interconnected cavities, and has excellent 3D printing processability. The honeycomb sandwich 22 is preferably manufactured by sintering TC4 powder using a selective laser melting (SLM) additive manufacturing process.

[0058] Figure 6 The present invention is a schematic diagram of the detachable structure of the acoustic liner in the air intake cone with noise reduction effect.

[0059] Figure 7 The figure is a schematic diagram of the integrated structure of the sound liner in the air intake cone with noise reduction effect according to the present invention.

[0060] like Figure 6 and Figure 7 As shown, in order to facilitate replacement, when the strength requirement is not high, the metal substrate of the air intake cone can also be used as the back plate 23 in this embodiment, and the honeycomb sandwich 22 and the perforated plate 21 are installed in sequence. The whole acoustic liner 20 can be set as a detachable or integrated structure, thereby forming two installation structures of detachable and integrated.

[0061] like Figure 1 As shown, the present invention further provides an aircraft engine, which includes the air intake cone 10 and the fan 30 with noise reduction effect as described above, and the air intake cone 10 is connected to the inner flow channel of the fan 30.

[0062] According to the above description, the air intake cone with noise reduction effect of the present invention and the aircraft engine including the same generate two kinds of impeller aerodynamic noise, namely self-noise and tip noise, when the rotor blades rotate. For the blades themselves, the noise diffusion mechanism can be weakened from the sound source by selecting the blade shape and material, and the sound propagation is effectively reduced by the sound lining.

[0063] The air inlet cone is connected to the inner flow channel of the fan, such as Figure 1 As shown, since the diameter of the air intake cone is small and the linear speed is also small, in order to further increase the laying area of ​​the acoustic lining, it is considered to lay the acoustic lining on the air intake cone.

[0064] The air intake cone with noise reduction effect of the present invention and the aircraft engine including the same can achieve the noise reduction requirements of multiple target frequencies in a targeted manner and broaden the sound absorption frequency band by optimizing the sound liner perforated plate thickness, aperture, perforation rate, honeycomb cavity depth, single-layer honeycomb or double-layer honeycomb design, metal wire mesh number and other sound liner structural parameters, thereby solving the defect of the traditional single-degree-of-freedom perforated plate honeycomb sound liner with a narrow sound absorption frequency band and effectively reducing the fan noise of the aircraft engine.

[0065] The present invention uses 3D printing technology to form an aircraft engine intake cone with acoustic lining. Under the premise of ensuring the shape of the intake cone, the acoustic lining is placed on the surface of the intake cone. At the same time, the acoustic lining is arranged away from the tip of the intake duct, which not only ensures the honeycomb laying space of the acoustic lining and the strength of the intake cone, but also can effectively reduce the fan forward noise.

[0066] In addition, since the air intake cone is close to the air intake port, in order to reduce the dust entering the air intake cone, widen the sound absorption band of the sound lining, and improve the low-frequency sound absorption coefficient, a metal wire mesh is laid on the surface of the sound lining. According to the target noise reduction requirements, it can be designed as a single-layer or double-layer honeycomb structure, which effectively improves the sound absorption effect of the sound lining.

[0067] In summary, the air intake cone with noise reduction effect and the aircraft engine including the same of the present invention place the acoustic liner on the surface of the air intake cone while ensuring the shape of the air intake cone. At the same time, the acoustic liner is arranged to avoid the tip part, which not only ensures the honeycomb laying space of the acoustic liner and the strength of the air intake cone, but also can effectively reduce the fan forward noise.

[0068] For those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary implementation of the present application.

[0069] At the same time, the present application uses specific words to describe the embodiments of the present application, such as "one embodiment", "an embodiment", and / or "some embodiments" to refer to a certain feature, structure or characteristic related to at least one embodiment of the present application.

[0070] Therefore, it should be emphasized and noted that "an embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different places in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0071] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An air intake cone with noise reduction effect, used in an aircraft engine, characterized in that: The surface of the air intake cone is paved with an acoustic liner, and the acoustic liner avoids the tip of the air intake cone; The acoustic liner comprises a perforated plate, at least one honeycomb sandwich layer and a back plate, wherein the honeycomb sandwich layer is installed between the perforated plate and the back plate, and the back plate is fixed to the surface of the air intake cone.

2. The air intake cone with noise reduction effect according to claim 1, characterized in that: The outer surface of the perforated plate is provided with a metal wire mesh.

3. The air intake cone with noise reduction effect according to claim 1, characterized in that: The honeycomb interlayer is a single-layer honeycomb interlayer or a double-layer honeycomb interlayer.

4. The air intake cone with noise reduction effect according to claim 1, characterized in that: The honeycomb sandwich is manufactured by sintering TC4 powder using a selective laser melting additive manufacturing process.

5. The air intake cone with noise reduction effect according to claim 4, characterized in that: The honeycomb layer is manufactured and formed by using a 3D printing process.

6. The air intake cone with noise reduction effect according to claim 1, characterized in that: An air intake cone metal substrate is used as the back plate.

7. The air intake cone with noise reduction effect according to claim 6, characterized in that: The honeycomb sandwich and the perforated plate are sequentially mounted on the air intake cone metal substrate.

8. The air intake cone with noise reduction effect according to claim 7, characterized in that: The sound liner is a detachable or integrated structure.

9. An aircraft engine, characterized in that: The aircraft engine comprises an air intake cone and a fan with noise reduction effect as described in any one of claims 1 to 8, wherein the air intake cone is connected to an inner flow passage of the fan.

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