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Vector aeroacoustics for a uniform mean flow: acoustic velocity and vortical velocity

Vector aeroacoustics for a uniform mean flow: acoustic velocity and vortical velocity
Vector aeroacoustics for a uniform mean flow: acoustic velocity and vortical velocity
Acoustic and vortical disturbances in uniform mean flow bounded with solid surfaces are investigated in this paper. A convective vector wave equation and a convection equation which describe, respectively, the acoustic velocity and vortical velocity in uniform mean flow are deduced by combining the Helmholtz-Hodge decomposition method with the method of Mao et al. (AIAA Journal, 2016, 54(6): 1922-1931). Analytical acoustic velocity integral formulations for the monopole and dipole sources in uniform mean flow are deduced from the developed vector wave equation, and are also verified through numerical test cases. Moreover, this paper clarifies that aerodynamic sound is radiated from the monopole source as well as the irrotational components of the dipole and quadrupole sources. The solenoidal parts of the dipole and quadrupole sources are acoustically non-radiating but they induce vortical disturbances in uniform mean flow.
Aeroacoustic analogy, Vector Analogy, Mean flow
0001-1452
2782-2793
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Xu, Chen
b53e92d4-e474-420b-a662-4af9a1c8750b
Ghorbaniasl, Ghader
d090261d-3b89-4302-935d-3ba0b3b6a2f5
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Xu, Chen
b53e92d4-e474-420b-a662-4af9a1c8750b
Ghorbaniasl, Ghader
d090261d-3b89-4302-935d-3ba0b3b6a2f5

Mao, Yijun, Hu, Zhiwei, Xu, Chen and Ghorbaniasl, Ghader (2018) Vector aeroacoustics for a uniform mean flow: acoustic velocity and vortical velocity. AIAA Journal, 56 (7), 2782-2793. (doi:10.2514/1.J056852).

Record type: Article

Abstract

Acoustic and vortical disturbances in uniform mean flow bounded with solid surfaces are investigated in this paper. A convective vector wave equation and a convection equation which describe, respectively, the acoustic velocity and vortical velocity in uniform mean flow are deduced by combining the Helmholtz-Hodge decomposition method with the method of Mao et al. (AIAA Journal, 2016, 54(6): 1922-1931). Analytical acoustic velocity integral formulations for the monopole and dipole sources in uniform mean flow are deduced from the developed vector wave equation, and are also verified through numerical test cases. Moreover, this paper clarifies that aerodynamic sound is radiated from the monopole source as well as the irrotational components of the dipole and quadrupole sources. The solenoidal parts of the dipole and quadrupole sources are acoustically non-radiating but they induce vortical disturbances in uniform mean flow.

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AIAAJ2018March11 Part 1 - Accepted Manuscript
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More information

Accepted/In Press date: 11 March 2018
e-pub ahead of print date: 21 May 2018
Keywords: Aeroacoustic analogy, Vector Analogy, Mean flow

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Local EPrints ID: 418761
URI: http://eprints.soton.ac.uk/id/eprint/418761
ISSN: 0001-1452
PURE UUID: 3302e00f-a0f1-466c-9d08-7f4f15b47c06

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Date deposited: 21 Mar 2018 17:30
Last modified: 26 Nov 2021 05:09

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Contributors

Author: Yijun Mao
Author: Zhiwei Hu
Author: Chen Xu
Author: Ghader Ghorbaniasl

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