Air inlet of an aircraft turbomachine nacelle, and associated method

Abstract

An air inlet of an aircraft turbomachine nacelle (1) extending along a main axis (X) oriented from front to rear, the air inlet comprising at least one acoustic device (3) comprising an acoustic core (30) on the inner wall (21) between the inner wall (21) and the outer wall (22), the inner wall (21) comprising at least one perforated portion (21P) facing the acoustic core (30) so as to allow the passage of acoustic waves, and at least one vibratory de-icing member (4) positioned in the inner cavity (20) between the acoustic core (30) and the perforated portion (21P), the vibratory de-icing member (4) being in contact with the perforated portion (21P) of the inner wall (21) in order to make it vibrate, and at a distance from the acoustic core (30).

Description

Air inlet of an aircraft turbomachine nacelle and associated method

[0001] The present invention relates to the field of aircraft turbomachines and more particularly relates to an air inlet for an aircraft nacelle comprising a de-icing device and an acoustic device.

[0002] Climate change is a major concern for many legislative and regulatory bodies around the world. Indeed, various carbon emission restrictions have been, are being, or will be adopted by various states. In particular, an ambitious standard applies to both new aircraft types and those already in operation, requiring the implementation of technological solutions to ensure their compliance with current regulations. Civil aviation has been mobilizing for several years now to contribute to the fight against climate change.

[0003] Technological research efforts have already led to very significant improvements in the environmental performance of aircraft. The Applicant takes into consideration the impact factors in all phases of design and development to obtain less energy-intensive, more environmentally friendly aeronautical components and products whose integration and use in civil aviation have moderate environmental consequences with the aim of improving the energy efficiency of aircraft.

[0004] Consequently, the Applicant is constantly working to reduce its negative climate impact by using methods and operating virtuous development and manufacturing processes and minimizing greenhouse gas emissions to the minimum possible in order to reduce the environmental footprint of its activity.

[0005] This sustained research and development work focuses on new generations of aircraft engines, the weight reduction of aircraft, particularly through the materials used and lighter on-board equipment, the development of the use of electrical technologies to ensure propulsion, and, as an essential complement to technological progress, aeronautical biofuels.

[0006] As is known, an aircraft comprises one or more turbomachines to enable its propulsion by accelerating an air flow which circulates from front to back in the turbomachine.

[0007] With reference to the, there is shown a turbomachine 1 extending along a main axis X oriented from front to rear and comprising a fan 11 rotatably mounted around the main axis X in a nacelle comprising an outer shroud 12. Subsequently, the terms front and rear are defined with respect to the circulation of the air flow F. The turbomachine 1 comprises at its front end an air inlet 2 comprising an inner cavity 20, extending annularly around the main axis X, which comprises an inner wall 21 facing the main axis X and an outer wall 22 which is opposite the inner wall 21, the walls 21, 22 are connected by a leading edge 23 also called "lip of the air inlet". The inner cavity 20 is delimited at the rear by a separating partition 24.Thus, the air inlet 2 makes it possible to separate the incoming air flow F into an interior air flow FINT guided by the interior wall 21 and an exterior air flow FEXT guided by the exterior wall 22. Subsequently, the terms interior and exterior are defined radially relative to the main axis X.

[0008] As is known, during the flight of an aircraft, due to the temperature and pressure conditions, frost is likely to accumulate near the leading edge 23 and the inner wall 21 of the air inlet 2 and to form blocks of frost which are likely to be ingested by the turbomachine 1. Such ingestions must be avoided in order to improve the service life of the turbomachine 1 and reduce malfunctions.

[0009] To eliminate the accumulation of frost, with reference to the, it is known to circulate a flow of hot air FAC in the interior cavity 20 in order to heat the interior wall 21 by thermal convection and thus prevent the accumulation of frost which melts as it accumulates.

[0010] The introduction of the hot air flow FAC into the interior cavity 20 is carried out by an injector 300 which is traditionally in the form of a tube of cylindrical section which is oriented in a direction perpendicular to the main axis X as illustrated in the. The hot air flow FAC moves circumferentially in the interior cavity 20 in order to heat the interior wall 21.

[0011] Furthermore, in order to reduce the acoustic emissions, with reference to the, it is known to provide an acoustic device 103 in the interior cavity 20 of the air inlet 2 which comprises, on the one hand, a honeycomb acoustic core 130, which is positioned on the interior wall 21 of the lip 2 and, on the other hand, a resistive outer skin 132 mounted externally to the honeycomb acoustic core 130. For this purpose, the interior wall 21 comprises a perforated portion 21a so as to capture the acoustic waves and attenuate them. Such a front acoustic device 103 is compatible with defrosting of the air inlet 2 by circulation of a hot air flow FAC. Similarly, it is known to provide an acoustic panel 103', positioned behind the air inlet 2, in particular, behind the partition wall 24.

[0012] In practice, the energy efficiency of this type of heating is low and requires a significant extraction of hot air flow FAC from the turbomachine. In addition, it is necessary to provide materials compatible with the hot air flow FAC, which increases the cost and complexity.

[0013] In order to eliminate this drawback, with reference to the, it is known to use a vibration defrosting device 104 comprising a plurality of piezoelectric elements 140 in the inner cavity 20 of the air inlet 2 on the inner wall 21 of the lip 2 in order to vibrate it and prevent the formation of frost. Such piezoelectric elements 140 only need to be electrically powered, which presents fewer constraints compared to defrosting the air inlet 2 by circulating a hot air flow FAC. However, the installation of piezoelectric elements 140 on the inner wall 21 of the air inlet 2 prevents the mounting of an acoustic device 103 in the inner cavity 20. Indeed, the piezoelectric elements 140 must be positioned in place of the honeycomb acoustic core 130 as illustrated in the.

[0014] To achieve high acoustic performance with piezoelectric elements 140, one solution is to lengthen the air inlet 2 so as to position a very long acoustic panel 103'. This has the disadvantage of increasing the mass and drag of the air inlet 2.

[0015] Document US20100301161A1 presents an acoustic coating comprising a heating layer. When the risk of frost is limited, it is taught to provide vibratory members on the outer wall of the air inlet.

[0016] The invention thus aims to eliminate this drawback by proposing a turbomachine nacelle air inlet which comprises an acoustic device in the interior cavity of the lip and which is defrosted by vibration. PRESENTATION OF THE INVENTION

[0017] To this end, the invention is the result of technological research aimed at very significantly improving the performance of aircraft and, in this sense, contributes to reducing the environmental impact of aircraft, the invention relates to an air intake of an aircraft turbomachine nacelle extending around a main axis oriented from front to rear, the air intake comprising an inner cavity extending annularly around the main axis and which comprises an inner wall facing the main axis and an outer wall which is opposite the inner wall, the walls being connected by a leading edge, the air intake comprising at least one acoustic device mounted on the inner wall between the inner wall and the outer wall, the acoustic device comprising an acoustic core,the inner wall comprising at least one perforated portion facing the acoustic core so as to allow the passage of acoustic waves.,

[0018] The air inlet is remarkable in that it comprises at least one vibratory defrosting member positioned between the acoustic core and the perforated portion, the vibratory defrosting member being in contact with the perforated portion of the inner wall in order to make it vibrate, and at a distance from the acoustic core.

[0019] Advantageously, it is not necessary to consume a hot air flow to carry out defrosting, which allows the use of less expensive and complex materials to work with. Due to the integration of the vibratory defrosting device, efficient defrosting can be achieved without deteriorating the acoustic attenuation performance. It is not necessary to extend the air inlet to install an acoustic panel offset from the vibratory defrosting device. Fuel consumption and space requirements are therefore not penalized. Mounting the vibratory defrosting device at a distance from the acoustic core prevents the transmission of vibrations to the latter. The lifespan of the acoustic device is therefore not "affected". The use of a vibratory defrosting device is less energy-intensive than defrosting with a hot air flow, which is beneficial from an environmental point of view.

[0020] In one aspect, the acoustic core is cellular, preferably honeycomb.

[0021] In one aspect, the vibrating defrosting member is of the piezoelectric type. This allows defrosting to be carried out without using hot air. Only a power supply is required to generate vibration. Its size is also reduced.

[0022] In one aspect, with an interposed space defined between the acoustic core and the perforated portion, a porous material is positioned in the interposed space. This physically isolates the vibration defrosting member and the acoustic core to facilitate mounting. Advantageously, vibrations are not transmitted from the perforated portion to the acoustic core.

[0023] In one aspect, the interlayer space having a volume, the porous material occupies at least 50% of the volume of the interlayer space, preferably at least 80%. This allows for optimal acoustic performance while providing mechanical support.

[0024] According to one aspect, the vibratory defrosting member having a thickness defined in a direction normal to the inner wall, the acoustic core of the acoustic device is spaced from the inner wall by a spacing distance defined in a direction normal to the inner wall, which is greater than the thickness of the vibratory defrosting member. This advantageously makes it possible to use an acoustic core of constant thickness to achieve uniform acoustic attenuation. The assembly is also simplified.

[0025] According to one aspect, the acoustic core having a thickness defined in a direction normal to the inner wall, the vibratory defrosting member extends into the thickness of the acoustic core. This makes it possible to reduce the size by integrating the vibratory defrosting member into the thickness of the acoustic core.

[0026] In one aspect, the vibratory de-icing device comprises at least one power cable configured to be connected to a control device in order to electrically power it, the power cable being positioned in the interposed space. The presence of an interposed space further allows easy routing of the power cables with low constraints.

[0027] In one aspect, the air inlet includes a plurality of vibratory defrosting members positioned between the acoustic device and the perforated portion, the plurality of vibratory defrosting members being in contact with the perforated portion of the inner wall to vibrate it.

[0028] According to one aspect, the interior cavity being delimited at the rear by a partition wall.

[0029] In one aspect, with the acoustic device mounted in the interior cavity, the vibratory defrosting member is positioned in the interior cavity. This advantageously allows the air inlet lip to be defrosted.

[0030] According to one aspect, the interior cavity being delimited at the rear by a partition wall, the acoustic device being mounted downstream of the partition wall, the vibratory defrosting member is positioned downstream of the partition wall. This makes it possible to defrost an area further downstream of the air inlet.

[0031] The invention also relates to an aircraft turbomachine nacelle extending along a main axis oriented from front to rear, the nacelle comprising an air inlet as presented previously.

[0032] The invention also relates to an aircraft comprising a turbomachine nacelle as presented previously.

[0033] The invention also relates to a method for using an air inlet as presented previously, method comprising at least one step consisting of:Electrically supplying the vibratory defrosting member so as to vibrate the perforated portion of the inner wall in order to defrost it, andAttenuating the acoustic waves passing through the perforated portion of the inner wall with the acoustic device. PRESENTATION OF FIGURES

[0034] The invention will be better understood upon reading the following description, given by way of example, and referring to the following figures, given by way of non-limiting examples, in which identical references are given to similar objects.

[0035] This is a schematic representation of an air intake of a nacelle according to the prior art.

[0036] This is a schematic cross-sectional representation of the circulation of a hot air flow in the air inlet according to the prior art.

[0037] This is a schematic cross-sectional representation of an air inlet comprising a hot air defrosting device according to the prior art, an acoustic device and an acoustic panel.

[0038] This is a schematic cross-sectional representation of an air inlet comprising a vibration defrosting device according to the prior art.

[0039] This is a schematic cross-sectional representation of an air inlet according to one embodiment of the invention.

[0040] This is a close-up schematic representation of the.

[0041] This is a close-up schematic representation of the.

[0042] This is a close-up schematic representation of another embodiment of an air inlet.

[0043] This is a close-up schematic representation of another embodiment of an air inlet.

[0044] This is a close-up schematic representation of the.

[0045] It should be noted that the figures set out the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary. DETAILED DESCRIPTION OF THE INVENTION

[0046] The invention relates to the field of aircraft turbomachines and more particularly relates to an air inlet of a nacelle of an aircraft turbomachine.

[0047] With reference to the, there is shown a turbomachine 1 extending along a main axis X oriented from front to rear and comprising a fan 11 rotatably mounted around the main axis X in a nacelle comprising an outer shroud 12. Subsequently, the terms front and rear are defined with respect to the circulation of the air flow F. The turbomachine 1 comprises at its front end an air inlet 2 comprising an inner cavity 20, extending annularly around the main axis X, which comprises an inner wall 21 facing the main axis X and an outer wall 22 which is opposite the inner wall 21, the walls 21, 22 are connected by a leading edge 23 also called "lip of the air inlet". The inner cavity 20 is delimited at the rear by a separating partition 24.Thus, the air inlet 2 makes it possible to separate the incoming air flow F into an interior air flow FINT guided by the interior wall 21 and an exterior air flow FEXT guided by the exterior wall 22. Subsequently, the terms interior and exterior are defined radially relative to the main axis X. The general structure of an air inlet 2 is known to those skilled in the art and will not be presented again in detail.

[0048] This is a cross-sectional representation of an air inlet 2 according to one embodiment of the invention. In this example, the air inlet 2 comprises an acoustic device 3 mounted in the interior cavity 20. The air inlet 2 further comprises another acoustic panel 3' mounted externally to the interior cavity 20. Thus, the acoustic device 3 is mounted upstream of the partition wall 24 while the acoustic panel 3' is mounted behind the partition wall 24. The acoustic panel 3' is optional but advantageous for reducing noise pollution.

[0049] As illustrated in , the inner wall 21 comprises a perforated portion 21P and a rear perforated portion 21P' respectively facing the acoustic device 3 and the acoustic panel 3' so as to allow the passage of acoustic waves in order to attenuate them.

[0050] Preferably, the acoustic device 3 comprises an acoustic core 30 and an outer skin 32 covering the acoustic core 30. Similarly, the acoustic panel 3' comprises an acoustic core 30' and an outer skin 32' covering the acoustic core 30'. Each acoustic core 30, 30' preferably has a cellular structure, for example, a honeycomb. The acoustic core 30, 30' is made of a composite or metallic material. The outer skin 32, 32' is made of a composite or metallic material and is secured to the inner wall 21.

[0051] The invention is remarkable in that the air inlet 2 comprises several vibratory defrosting members 4 positioned in the interior cavity 20 between the acoustic device 3 and the perforated portion 21P. As illustrated in , the vibratory defrosting members 4 are in contact with the perforated portion 21P of the interior wall 21 in order to make it vibrate. The introduction of vibratory defrosting members 4 on the perforated portion 21P makes it possible to carry out defrosting that consumes less energy than defrosting with a flow of hot air as in the prior art. The vibration of the vibratory defrosting members 4 causes a displacement of the perforated portion 21P of the order of a micrometer, which will break up the frost already present.

[0052] In practice, the presence of vibratory defrosting members 4 only slightly affects the transmission of acoustic waves in the acoustic device 3, which makes it possible to maintain good acoustic attenuation performance. When a plurality of vibratory defrosting members 4 is uniformly distributed over the perforated portion 21P of the inner wall 21, uniform defrosting can advantageously be achieved while maximizing acoustic attenuation.

[0053] Preferably, the vibratory defrosting members 4 are spaced, in the axial direction and in the circumferential direction to the main axis X, by a distance ranging from 10 mm to 300 mm. This makes it possible in particular to facilitate the routing of their power cables as will be presented later.

[0054] Each vibrating defrosting member 4 is at a distance from the acoustic core 30 of the acoustic device 3 in order to avoid causing it to vibrate. Indeed, causing the acoustic core 30 of the acoustic device 3 to vibrate would cause rapid wear and reduce its service life.

[0055] In this example, the use of several vibratory defrosting members 4 positioned in the interior cavity 20 has been presented, but it goes without saying that the invention also applies to a single vibratory defrosting member 4 positioned in the interior cavity 20.

[0056] Likewise, without departing from the scope of the invention, the vibratory defrosting members 4 could be positioned downstream of the separating partition 24 between the acoustic panel 3' and the perforated portion 21P' as illustrated in. The important thing is to maintain a spacing between the perforated portion 21P, 21P' on which the vibratory defrosting members 4 are positioned and the acoustic device 3 / acoustic panel 3'. The positioning of the vibratory defrosting members 4 upstream or downstream of the separating partition 24 is immaterial.

[0057] In this example, as illustrated in , the air inlet 2 further comprises auxiliary vibratory defrosting members 4' positioned on the air inlet lip 23 and on the outer wall 22. This advantageously makes it possible to defrost the different parts of the air inlet 2 uniformly.

[0058] Preferably, each vibratory defrosting member 4, 4' is of the piezoelectric type and is configured to vibrate when it receives an electric supply current. This makes it possible to vibrate the wall on which it is mounted in order to defrost it.

[0059] As will be presented later, the vibratory defrosting members 4 positioned in contact with the perforated portion 21P and the auxiliary vibratory defrosting members 4' are connected to a control device 7 (Figures 6, 8 and 9) via control wires 71 in order to be able to be electrically powered.

[0060] According to a first embodiment shown in , the acoustic core 30 is spaced from the inner wall 21, in particular from the perforated portion 21P, by a spacing distance d3. The spacing distance d3 is defined relative to a direction N normal to the inner wall 21. In particular, the spacing distance d3 is measured between the inner end of the acoustic core 30 and the inner wall 21.

[0061] Thus, the air inlet 2 comprises an intermediate space 6 defined in the interior cavity 20 between the acoustic device 3 and the perforated portion 21P as illustrated in. Preferably, the spacing distance d3 is between 0.1 mm and 1.5 mm.

[0062] The presence of an intermediate space 6 makes it possible to reserve space for the positioning of the vibratory defrosting members 4. The acoustic waves thus circulate in the intermediate space 6 before being attenuated by the acoustic core 30 of the acoustic device 3.

[0063] In this example, with reference to figures 6 and 7, each vibratory defrosting member 4 has a thickness e4 defined along a direction N normal to the inner wall 21.

[0064] With reference to Figures 6 and 7, the spacing distance d3 is greater than the thickness e4 of each vibratory deicing member 4. This makes it possible to mount the vibratory deicing members 4 with few constraints, which is advantageous. The acoustic core 30 advantageously has a constant thickness e3 and homogeneous acoustic performance. As illustrated in the, each vibratory deicing member 4 is spaced from the acoustic core 30 in the normal direction N to the inner wall 21 by a normal protection distance d4 which is greater than or equal to 0.1 mm. Such a normal protection distance d4 advantageously allows functional movement of each vibratory deicing member 4 during its activation. This makes it possible to avoid any contact with the acoustic core 30.

[0065] Preferably, the thickness e4 of each vibratory defrosting member 4 is between 1mm and 5mm. According to a preferred aspect, if the spacing distance d3 is less than 1.5mm, the thickness e4 of each vibratory defrosting member 4 is between 0.5mm and 1.4mm. Preferably, each vibratory defrosting member 4 has a length, defined parallel to the inner wall 21, of between 6mm and 70mm.

[0066] In this example, with reference to the, each vibratory de-icing device 4 comprises a power cable 71 connected to a control device 7 in order to supply it with electricity. Advantageously, the power cable 71 is positioned in the interior cavity 20 between the acoustic device 3 and the perforated portion 21P. Advantageously, the intermediate space 6 is used to position the vibratory de-icing devices 4 and the associated power cables 71. The assembly is thus practical and rapid. Preferably, the control device 7 is positioned behind the partition wall 24.

[0067] A second embodiment is shown in FIG. 1. For the sake of clarity and conciseness, the elements common to the first embodiment will not be presented again.

[0068] In this second embodiment, a porous material 5 is positioned in the interior cavity 20 between the acoustic device 3 and the perforated portion 21P. The porous material 5 is acoustically porous. With reference to the, the porous material 5 is positioned in the interposed space 6 between the acoustic core 30 and the perforated portion 21P. The interposed space 6 having a volume, the porous material 5 occupies at least 50% of the volume of the interposed space 6, preferably at least 80%.

[0069] Preferably, the porous material 5 has a flexibility which advantageously allows sealing and aerodynamic smoothing of the inner wall 21. Such flexibility or suppleness advantageously facilitates the filling of the intermediate space 6.

[0070] Preferably, the porous material 5 is connected to the inner wall 21, advantageously allowing better support of the acoustic device 3 by reducing the forces induced by a movement of the porous material 5 in the intermediate space 6.

[0071] The porous material 5 is preferably in the form of felt or foam which makes it possible to isolate the acoustic core 30 from the vibrations emitted by the vibratory defrosting members 4, while allowing the acoustic waves to pass through. The porous material 5 advantageously fulfills a mechanical damper function. The intermediate space 6 is thus filled, which allows better stability during assembly and improves the service life.

[0072] A third embodiment is shown in FIG. 1. For the sake of clarity and conciseness, the elements common to the first embodiment will not be presented again.

[0073] In this third embodiment, the spacing distance d3 is less than the thickness e4 of each vibratory defrosting member 4. Thus, the vibratory defrosting members 4 extend partially into the thickness of the acoustic core 30. The normal protection distance d4 is not zero so as to avoid the transmission of mechanical vibrations from the inner wall 21 to the acoustic core 30. Similarly, each vibratory defrosting member 4 is spaced apart from the acoustic core 30 in which it extends by a non-zero axial protection distance d6. Similarly, each vibratory defrosting member 4 is spaced apart from the acoustic core 30 in which it extends by a non-zero circumferential protection distance. Preferably, the normal protection distance d4, the axial protection distance d6 and the circumferential protection distance are greater than 0.1 mm.Similarly, such protection distances advantageously allow functional movement of each vibratory defrosting member 4 during its activation. This makes it possible to avoid any contact with the acoustic core 30.

[0074] With reference to 1, an insertion distance d5 is defined along a normal direction N to the inner wall 21 which corresponds to the portion of each defrosting member 4 which extends into the thickness e3 of the acoustic core 30 of the acoustic device 3. This advantageously makes it possible to reduce the size in the inner cavity 20 of the air inlet 2.

[0075] With reference to the, the acoustic device 3 comprises a plurality of housings 33 in which the vibratory defrosting members 4 are positioned. At least one housing 33, preferably each, is in the form of a cutout made in the acoustic core 30.

[0076] Similarly to the second embodiment, a porous material 5 can be positioned in the intercalary space 6, defined for the third embodiment, even if the latter is reduced.

[0077] One or more acoustic devices 3 positioned in the interior cavity 20 have been presented, as well as one or more vibratory defrosting members 4 positioned in the interior cavity 20, that is to say, upstream of the partition wall 24. The invention applies more generally to one or more acoustic devices 3 positioned on the interior wall 21 between the interior wall 21 and the exterior wall 22, as well as one or more vibratory defrosting members 4 positioned on the interior wall 21 between the interior wall 21 and the exterior wall 22. In particular, the invention applies to one or more acoustic devices 3 positioned downstream of the partition wall 24, as well as one or more vibratory defrosting members 4 positioned downstream of the partition wall 24.In particular, the invention applies to one or more acoustic devices 3 positioned upstream and downstream of the separating partition 24 as well as one or more vibratory de-icing members 4 positioned upstream and downstream of the separating partition 24.

[0078] An example of implementation of a method of using an air inlet 2 according to the invention will now be presented with reference to the embodiment of the.

[0079] The method comprises a step of electrically powering the vibratory defrosting members 4 so as to vibrate the perforated portion 21P of the inner wall 21 in order to defrost it. The control device 7 provides a power supply current to the vibratory defrosting members 4 via the power cables 71 in order to vibrate them. The vibrations are advantageously not transmitted to the acoustic core 30. The use of a porous material 5 makes it easier to mount by forming a mechanical damper.

[0080] Advantageously, the auxiliary vibratory defrosting members 4' () are also set into vibration so as to defrost all the walls of the air inlet 2.

[0081] The method comprises a step of attenuating the acoustic waves passing through the perforated portion 21P of the front inner wall 21 with the acoustic device 3. The acoustic waves propagate in the intermediate space 6 to be attenuated in the cells of the acoustic device 3 which advantageously form Helmholtz type resonators.

[0082] Advantageously, the acoustic panel 3' () also allows its acoustic attenuation function to be fulfilled. Due to the integration of the vibration defrosting members 4 with the acoustic device 3, the acoustic performance is advantageously not degraded. It is therefore not necessary to lengthen the air inlet 2 to install a 3' acoustic panel of increased length.

Claims

Air inlet (2) of a nacelle of an aircraft turbomachine (1) extending around a main axis (X) oriented from front to rear, the air inlet (2) comprising an inner cavity (20) extending annularly around the main axis (X) and which comprises an inner wall (21) facing the main axis (X) and an outer wall (22) which is opposite the inner wall (21), the walls (21, 22) being connected by a leading edge (23), the air inlet (2) comprising at least one acoustic device (3) mounted on the inner wall (21) between the inner wall (21) and the outer wall (22), the acoustic device (3) comprising an acoustic core (30), the inner wall (21) comprising at least one perforated portion (21P) facing the acoustic core (30) so as to allow the passage of acoustic waves,air inlet characterized by the fact that it comprises at least one vibratory defrosting member (4) positioned between the acoustic core (30) and the perforated portion (21P), the vibratory defrosting member (4) being in contact with the perforated portion (21P) of the inner wall (21) in order to make it vibrate, and at a distance from the acoustic core (30)., Air inlet (2) according to claim 1, in which an intermediate space (6) is defined between the acoustic core (30) and the perforated portion (21P). Air inlet (2) according to claim 2, wherein a porous material (5) is positioned in the interspace (6). Air inlet (2) according to one of claims 1 to 3, in which the vibratory defrosting member (4) having a thickness (e4) defined in a direction normal (N) to the inner wall (21), the acoustic core (30) of the acoustic device (3) is spaced from the inner wall (21) by a spacing distance (d3), defined in the normal direction (N), which is greater than the thickness (e4) of the vibratory defrosting member (4). Air inlet (2) according to one of claims 1 to 4, in which the acoustic core (30) having a thickness (e3) defined in a direction normal (N) to the inner wall (21), the vibratory defrosting member (4) extends in the thickness (e3) of the acoustic core (30). Air inlet (2) according to one of claims 2 to 5, wherein the vibratory defrosting device (4) comprises at least one power cable (71) configured to be connected to a control device (7) in order to supply it electrically, the power cable (71) being positioned in the intermediate space (6). Air inlet (2) according to one of claims 1 to 6, comprising a plurality of vibratory defrosting members (4) positioned between the acoustic device (3) and the perforated portion (21P), the plurality of vibratory defrosting members (4) being in contact with the perforated portion (21P) of the inner wall (21) in order to make it vibrate. Air inlet (2) according to one of claims 1 to 7, wherein the acoustic device (3) being mounted in the interior cavity (20), the vibratory defrosting member (4) is positioned in the interior cavity (20). Aircraft turbomachine nacelle (1) extending along a main axis (X) oriented from front to rear, the nacelle (1) comprising an air inlet (2) according to one of claims 1 to 8. Method for using an air inlet (2) according to one of claims 1 to 8, method comprising at least one step consisting of:Electrically supplying the vibratory defrosting member (4) so ​​as to vibrate the perforated portion (21P) of the inner wall (21) in order to defrost it, andAttenuating the acoustic waves passing through the perforated portion (21P) of the inner wall (21) with the acoustic device (3).

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