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Cavity noise control method

A control method and cavity noise technology, which are used in aircraft control, affecting the air flow through the surface of the aircraft, aircraft parts, etc., can solve the problems of low applicability and the inability of the jet device to adjust the flow, and achieve a simple and easy configuration. The effect of machining and reducing cavity noise

Pending Publication Date: 2021-04-09
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is also a device for installing a jet at the front edge of the cavity to suppress cavity noise, but the jet device cannot adjust the flow according to specific rules, and the applicability is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, combined with figure 1 As shown, there is provided a method of air blowing control at the leading edge of cavity 1 using an air blowing device for cavity noise control, which is used to reduce the internal noise of the cavity.

[0020] Wherein, the air blowing device includes an air blowing pipeline 2 and an air source device 3 . The outlet of the air blowing pipe 2 is located at an appropriate position in front of the front edge of the cavity 1, and the air source device 3 is arranged at a position below the front of the cavity. There is at least one outlet of the air blowing pipe 2, and there may be more than one. The outlet of the blowing duct 2 is arranged along the width direction of the cavity 1 . The gas source device 3 can use gases of different densities or temperatures.

[0021] Adjusting the flow rate of the blowing pipe 2 and the gas source device 3 can change the height of the shear layer at the leading edge of the cavity 1 and change ...

Embodiment 2

[0027] In this embodiment, combined with figure 2 As shown, another air blowing control method on the front wall of the cavity 1 is provided to reduce the internal noise of the cavity by using the air blowing device to control the cavity noise.

[0028] Wherein, the air blowing device includes an air blowing pipeline 2 and an air source device 3 . The outlet of the blowing duct 2 is located at an appropriate position on the front wall of the cavity 1, and the air source device 3 is arranged at a position below the front of the cavity. There is at least one outlet of the blowing duct 2, and there may be multiple outlets. The outlets of the blowing pipes 2 are symmetrically arranged along the width direction of the cavity 1 ; or arranged in accordance with the depth direction of the cavity 1 . The gas source device 3 can use gases of different densities or temperatures.

[0029] Adjusting the flow rate of the blowing pipe 2 and the air source device 3 can change the flow fed...

Embodiment 3

[0035] In this embodiment, combined with image 3 As shown, another air blowing control method at the bottom of the cavity 1 is provided to reduce the internal noise of the cavity by using the air blowing device to control the cavity noise.

[0036] Wherein, the air blowing device includes an air blowing pipeline 2 and an air source device 3 . The outlet of the blowing pipe 2 is located at a proper position on the bottom wall of the cavity 1, and the air source device 3 is arranged at a position below the cavity. There is at least one outlet of the blowing duct 2, and there may be multiple outlets. The outlets of the blowing pipes 2 are arranged symmetrically along the width direction of the cavity 1 ; or arranged along the length direction of the cavity 1 . The gas source device 3 can use gases of different densities or temperatures.

[0037] Adjusting the flow rate of the blowing pipe 2 and the air source device 3, on the one hand, reduces the vortex inside the cavity 1, ...

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Abstract

The invention belongs to the field of aircraft noise control, and particularly relates to a cavity noise control method. The invention provides a cavity noise control method. An air blowing device is arranged at any one or more of the front edge, the front wall, the side wall, the rear wall or the bottom of a cavity; air is blown into the cavity through the air blowing device so as to disturb air flow in the cavity and reduce noise in the cavity.

Description

technical field [0001] The invention belongs to the field of aircraft noise control, and in particular relates to a cavity noise control method. Background technique [0002] Cavity structures are common structures in aircraft, such as landing gear compartments, slat / flap compartments, equipment compartments, and bomb bays. During take-off and landing and flight, when the door is opened, the cavity is exposed to the airflow, and the incoming shear layer at the front of the cavity interacts with the airflow inside the cavity, which may generate self-excited oscillations and strong noise. On the one hand, strong noise will affect the environment around the airport and cause noise pollution; on the other hand, strong cavity noise will cause damage to the internal structure of the cavity, equipment failure or misoperation, and in severe cases will endanger flight safety. [0003] The current common cavity noise control device is to install spoiler devices on the front edge of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C21/02
CPCB64C21/02
Inventor 高飞胡陈映顾金桃王美燕肖乾
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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