Mechanism and control of airframe noise of large passenger aircraft

WANG Shang; CHEN Binnian; CHEN Guoyong; YANG Xiaoquan; Weng Peifen

doi:10.11729/syltlx20230058

Volume 38 Issue 3

Jun. 2024

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Journal of Experiments in Fluid Mechanics > 2024 > 38(3): 63-78. > DOI: 10.11729/syltlx20230058

WANG S, CHEN B N, CHEN G Y, et al. Mechanism and control of airframe noise of large passenger aircraft[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(3): 63-78. DOI: 10.11729/syltlx20230058

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WANG S, CHEN B N, CHEN G Y, et al. Mechanism and control of airframe noise of large passenger aircraft[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(3): 63-78. DOI: 10.11729/syltlx20230058

Citation:

WANG S, CHEN B N, CHEN G Y, et al. Mechanism and control of airframe noise of large passenger aircraft[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(3): 63-78. DOI: 10.11729/syltlx20230058

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Mechanism and control of airframe noise of large passenger aircraft

WANG Shang^{1, 2,},
CHEN Binnian^{1, 2},
CHEN Guoyong^{1, 2},
YANG Xiaoquan^{1, 2, ,},
Weng Peifen^{1, 2}

1.
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai　200072, China
2.
School of Mechanics and Engineering Science, Shanghai University, Shanghai　200072, China

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Received Date: April 26, 2023
Revised Date: May 28, 2024
Accepted Date: June 03, 2024
Available Online: August 01, 2024

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Abstract

Abstract

The aerodynamic noise is not only the key problem of airworthiness forensics of large airliners, but also an important index related to passenger comfort. High lift device noise and landing gear noise are the main sources of airframe noise. In this paper, the key problems of the noise mechanism and control of the noise high lift device and landing gear in the development of large passenger aircraft are studied. In view of the noise generation mechanism, a novel noise source analysis method is proposed for vortex dynamics processes such as vorticity near wall boundary and boundary vorticity flux. Aiming at the noise control of the airframe, the small-scale wavy control method of the slat wing cove and large-scale wavy control method of landing gear support strut are proposed. The numerical results show that the slat cove is the main noise source of the high lift devices. The noise and pure tone peaks of the low and middle frequencies are mainly from the slat cove and the leading edge of the main wing, and the trailing edge flap makes a relatively small contribution to the noise. A large number of complex large-scale turbulent vortex structures exist in the wake region of the landing gear and the cove region of wheels, which are the main noise source of the landing gear. The noise characteristics of each landing gear component basically exhibit broadband characteristics. The strut component has the largest radiation noise, and the axle and torque link components have relatively small radiation noise. The slat cove wavy noise control method has both drag reduction and noise reduction effects. The large-scale wavy noise control method of the landing gear can reduce the far-field radiation noise effectively. The research content of this paper provides technical support for the integrated pneumatic and noise design of high lift device and noise reduction design of the landing gear.
- airframe noise,
- high lift device,
- landing gear,
- noise mechanism,
- noise control

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References (47)

References

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Mechanism and control of airframe noise of large passenger aircraft

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