Prediction of vortex-shedding noise from the blunt trailing edge of a flat plate
Prediction of vortex-shedding noise from the blunt trailing edge of a flat plate
A time-domain hybrid approach for aerodynamic noise prediction is developed based on a discrete vortex model (DVM) for the unsteady incompressible flow simulation and the acoustic perturbation equations (APE) for the acoustical field computation. The aim is to assess the applicability of the present DVM-APE method to the problems where sound is generated by the large-scale coherent flow structures. The hybrid DVM-APE approach is employed to predict the vortex-shedding noise from the blunt trailing edge of a flat plate. Simulations are implemented on flat plates with different thicknesses in a certain range of low Mach numbers, in order to identify the scaling dependence of the vortex-shedding noise on the freestream speed as well as the plate thickness. Acoustical directivity patterns at different Helmholtz numbers are presented, and agreements are achieved when compared with previous studies. A comparison of the sound pressure level spectrum between the present DVM-APE simulation and the published experimental results is also presented, showing good agreements for both the peak frequencies and the sound pressure levels.
Acoustic perturbation equations, Bluntness, Discrete vortex model, Noise prediction, Trailing edge, Vortex shedding
20-30
Wu, Long
9787473b-a81a-47ce-a696-22afa8c2204b
Jing, Xiaodong
9bd7313a-4ab2-4387-839e-4c1583f61531
Sun, Xiaofeng
87a75751-8d01-440e-a234-02d4a6436ef6
10 November 2017
Wu, Long
9787473b-a81a-47ce-a696-22afa8c2204b
Jing, Xiaodong
9bd7313a-4ab2-4387-839e-4c1583f61531
Sun, Xiaofeng
87a75751-8d01-440e-a234-02d4a6436ef6
Wu, Long, Jing, Xiaodong and Sun, Xiaofeng
(2017)
Prediction of vortex-shedding noise from the blunt trailing edge of a flat plate.
Journal of Sound and Vibration, 408, .
(doi:10.1016/j.jsv.2017.07.013).
Abstract
A time-domain hybrid approach for aerodynamic noise prediction is developed based on a discrete vortex model (DVM) for the unsteady incompressible flow simulation and the acoustic perturbation equations (APE) for the acoustical field computation. The aim is to assess the applicability of the present DVM-APE method to the problems where sound is generated by the large-scale coherent flow structures. The hybrid DVM-APE approach is employed to predict the vortex-shedding noise from the blunt trailing edge of a flat plate. Simulations are implemented on flat plates with different thicknesses in a certain range of low Mach numbers, in order to identify the scaling dependence of the vortex-shedding noise on the freestream speed as well as the plate thickness. Acoustical directivity patterns at different Helmholtz numbers are presented, and agreements are achieved when compared with previous studies. A comparison of the sound pressure level spectrum between the present DVM-APE simulation and the published experimental results is also presented, showing good agreements for both the peak frequencies and the sound pressure levels.
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More information
Accepted/In Press date: 10 July 2017
e-pub ahead of print date: 14 July 2017
Published date: 10 November 2017
Additional Information:
Funding Information: the financial support of National Natural Science Foundation of China (Grant Nos. 51576009 and 73052701) is gratefully acknowledged.
Keywords:
Acoustic perturbation equations, Bluntness, Discrete vortex model, Noise prediction, Trailing edge, Vortex shedding
Identifiers
Local EPrints ID: 485877
URI: http://eprints.soton.ac.uk/id/eprint/485877
ISSN: 0022-460X
PURE UUID: fa4e7770-0018-44b7-80c0-7692b8cdf709
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Date deposited: 03 Jan 2024 19:33
Last modified: 18 Mar 2024 03:51
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Contributors
Author:
Long Wu
Author:
Xiaodong Jing
Author:
Xiaofeng Sun
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