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Zero-mass jet flow control-based leading edge slat noise suppression method

A leading edge slat and jet control technology, which is used in aircraft control, affects the air flow through the surface of the aircraft, wings and other directions, can solve the problems of bleed air and difficulty in arranging pipes, and achieves flexible control, fast response, and energy. low cost effect

Active Publication Date: 2018-05-08
XIAMEN UNIV
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AI Technical Summary

Problems solved by technology

The method of blowing air into the cavity of the leading edge slat also has problems such as arranging pipes in the leading edge slat and difficulty in entraining air. Therefore, it is urgent to further develop a more effective and flexible flow control method to suppress the noise of the leading edge slat

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  • Zero-mass jet flow control-based leading edge slat noise suppression method
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  • Zero-mass jet flow control-based leading edge slat noise suppression method

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Embodiment Construction

[0026] Taking the multi-section wing 30P30N as an example, the present invention introduces a method for suppressing leading-edge slat noise based on zero-mass jet flow. The multi-section airfoil is composed of three parts: leading edge slat, main wing and trailing edge flap. The chord length of the wing is C. figure 1 and 2 , 1 denotes the slat, 2 denotes the main wing, 3 denotes the flap, 4 denotes the slat cavity, 5 denotes the slat tip (cusp), and 6 denotes the slat suction surface.

[0027] The specific steps for reducing the noise of leading edge slats by using zero mass jet are as follows:

[0028] Step 1: Select a zero-mass jet actuator. The average speed of the jet generated by the exciter is 60-120m / s, and the excitation frequency can be adjusted, and the adjustment range is 1000-4000Hz. The zero-mass jet actuator can be a piezoelectric thin-film type or a piston-type zero-mass jet actuator. When the zero-mass jet actuator works, the piston or the piezoelectric f...

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Abstract

The invention discloses a zero-mass jet flow control-based leading edge slat noise suppression method and relates to an airframe noise suppression method. Zero-mass jet flow exciters are selected; thezero-mass jet flow exciters are distributed on the suction surface, close to a cusp, of a leading edge slat at equal intervals; through adopting the method of computational fluid mechanics numericalsimulations or tunnel experiments, noise data of the leading edge slat with / without adopting zero-mass jet flow control under the different flight states during take-off and landing of an aircraft areobtained, and a noise database is established; through conducting comparative analysis of the noise database, parameter settings, such as excitation frequencies and exit momentum coefficients of thezero-mass jet flow exciters capable of achieving the leading edge slat de-noising effect under different flight states during take-off and landing of the aircraft are obtained; and control parametersof the zero-mass jet flow exciters are stored in an on-board computer, when the aircraft is under the takeoff and landing states, the parameters of the exciters are adjusted according to different flight states, and the effect of suppressing noise of the leading edge slat is achieved.

Description

technical field [0001] The invention relates to an aircraft body noise suppression method, in particular to a leading edge slat noise suppression method based on zero-mass jet flow control. Background technique [0002] In the design of modern civil aviation airliners, aircraft noise has always been a key concern. The U.S. Federal Airworthiness Regulations impose strict restrictions on the noise level of civil aviation passenger aircraft. If the noise exceeds this limit, it will directly affect the airworthiness certification of civil aviation passenger aircraft. The main sources of aircraft noise are aircraft engine noise and aircraft body noise. With the development of engine noise reduction technology, the noise level of engines has dropped significantly, and the problem of aircraft body noise has become increasingly prominent. Slat noise is one of the main sources of airframe noise. [0003] At present, leading-edge slat noise suppression technologies mainly include pa...

Claims

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Application Information

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IPC IPC(8): B64C23/00B64C3/28
CPCB64C3/28B64C23/005
Inventor 陈荣钱刘万鸿王李璨邱若凡尤延铖
Owner XIAMEN UNIV
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