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Vector aeroacoustics for a uniform mean flow: acoustic intensity and acoustic power

Vector aeroacoustics for a uniform mean flow: acoustic intensity and acoustic power
Vector aeroacoustics for a uniform mean flow: acoustic intensity and acoustic power
Acoustic vectors, such as acoustic velocity and acoustic intensity, have advantages over acoustic scalars in showing the detailed propagation path of acoustic energy. In this paper, acoustic vector fields around monopole and dipole sources in uniform mean flow are computed and visualized. Computational results reveal that acoustic intensity fields do not satisfy the feature of the convective amplification, and the directivity pattern of the acoustic intensity is highly dependent on the source type and the mean flow Mach number. Analytical and numerical results indicate that the acoustic power output from a monopole source is always conservative, but the acoustic power output from a dipole source is non-conservative in a uniform mean flow because there is a conversion between the acoustic energy and the vortical energy. Acoustic power output from uniformly moving sources in a quiescent acoustic medium is compared with that from the corresponding stationary sources in a uniform mean flow. The results indicate that the acoustic power output from the monopole sources is nearly the same, but the acoustic power output from the dipole sources is not equivalent in these two cases, and the deviation becomes significant with the increase in the mean flow Mach number.
Aeroacoustic analogy, Vector Analogy, Mean flow, acoustic power
0001-1452
2794-2805
Xu, Chen
b53e92d4-e474-420b-a662-4af9a1c8750b
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Ghorbaniasl, Ghader
d090261d-3b89-4302-935d-3ba0b3b6a2f5
Xu, Chen
b53e92d4-e474-420b-a662-4af9a1c8750b
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Ghorbaniasl, Ghader
d090261d-3b89-4302-935d-3ba0b3b6a2f5

Xu, Chen, Mao, Yijun, Hu, Zhiwei and Ghorbaniasl, Ghader (2018) Vector aeroacoustics for a uniform mean flow: acoustic intensity and acoustic power. AIAA Journal, 56 (7), 2794-2805. (doi:10.2514/1.J056853).

Record type: Article

Abstract

Acoustic vectors, such as acoustic velocity and acoustic intensity, have advantages over acoustic scalars in showing the detailed propagation path of acoustic energy. In this paper, acoustic vector fields around monopole and dipole sources in uniform mean flow are computed and visualized. Computational results reveal that acoustic intensity fields do not satisfy the feature of the convective amplification, and the directivity pattern of the acoustic intensity is highly dependent on the source type and the mean flow Mach number. Analytical and numerical results indicate that the acoustic power output from a monopole source is always conservative, but the acoustic power output from a dipole source is non-conservative in a uniform mean flow because there is a conversion between the acoustic energy and the vortical energy. Acoustic power output from uniformly moving sources in a quiescent acoustic medium is compared with that from the corresponding stationary sources in a uniform mean flow. The results indicate that the acoustic power output from the monopole sources is nearly the same, but the acoustic power output from the dipole sources is not equivalent in these two cases, and the deviation becomes significant with the increase in the mean flow Mach number.

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AIAAJ2018March11 Part 2 - Accepted Manuscript
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More information

Accepted/In Press date: 11 March 2018
e-pub ahead of print date: 29 May 2018
Keywords: Aeroacoustic analogy, Vector Analogy, Mean flow, acoustic power

Identifiers

Local EPrints ID: 418760
URI: http://eprints.soton.ac.uk/id/eprint/418760
ISSN: 0001-1452
PURE UUID: 182fca2d-a440-4198-8de7-8ada201b93c9

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Date deposited: 21 Mar 2018 17:30
Last modified: 22 Nov 2021 06:13

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Contributors

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

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