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On wavenumber spectra for sound within subsonic jets

On wavenumber spectra for sound within subsonic jets
On wavenumber spectra for sound within subsonic jets
This paper explores the nature of sound spectra within subsonic jets. Three problems of increasing complexity are presented. First, a point source is placed in a two-dimensional plug flow and the sound field is obtained analytically. Second, a point source is embedded in a diverging axisymmetric jet and the sound field is obtained by solving the linearized Euler equations. Finally, an analysis of the acoustic waves propagating through a turbulent jet obtained by direct numerical simulation is presented. In each problem, the pressure or density field is analyzed in the frequency-wavenumber domain. It is found that acoustic waves can be classified into three main frequency-dependent groups. A physical justification is provided for this classification. The main conclusion is that, at low Strouhal numbers, acoustic waves satisfy the d'Alembertian dispersion relation.
0001-4966
1029-1035
Argawal, A.
2bd37f11-164c-47ab-a78f-cf8535b4e543
Sinayako, S.
cbda1421-3b5c-4a15-83e2-4d197f109f17
Sandberg, R.D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Argawal, A.
2bd37f11-164c-47ab-a78f-cf8535b4e543
Sinayako, S.
cbda1421-3b5c-4a15-83e2-4d197f109f17
Sandberg, R.D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa

Argawal, A., Sinayako, S. and Sandberg, R.D. (2014) On wavenumber spectra for sound within subsonic jets. Journal of the Acoustical Society of America, 136 (3), 1029-1035. (doi:10.1121/1.4890648).

Record type: Article

Abstract

This paper explores the nature of sound spectra within subsonic jets. Three problems of increasing complexity are presented. First, a point source is placed in a two-dimensional plug flow and the sound field is obtained analytically. Second, a point source is embedded in a diverging axisymmetric jet and the sound field is obtained by solving the linearized Euler equations. Finally, an analysis of the acoustic waves propagating through a turbulent jet obtained by direct numerical simulation is presented. In each problem, the pressure or density field is analyzed in the frequency-wavenumber domain. It is found that acoustic waves can be classified into three main frequency-dependent groups. A physical justification is provided for this classification. The main conclusion is that, at low Strouhal numbers, acoustic waves satisfy the d'Alembertian dispersion relation.

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More information

Published date: 2014
Organisations: Aeronautics, Astronautics & Comp. Eng, Aerodynamics & Flight Mechanics Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 370729
URI: http://eprints.soton.ac.uk/id/eprint/370729
ISSN: 0001-4966
PURE UUID: 1d141dfc-65a9-4278-8b89-252be736ce84
ORCID for R.D. Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

Catalogue record

Date deposited: 05 Nov 2014 11:49
Last modified: 20 Jul 2019 00:56

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