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Geometry effect on the airfoil-gust interaction noise in transonic flows

Geometry effect on the airfoil-gust interaction noise in transonic flows
Geometry effect on the airfoil-gust interaction noise in transonic flows

Numerical simulations are conducted to investigate the impacts of airfoil thickness, the angle of attack and camber on the airfoil-gust interaction noise in transonic flows where locally supersonic regimes and terminating shocks are present. The conclusions about the geometry effects based on the extensively studied subsonic cases are revisited. With the increase of airfoil thickness, the sound generation is reduced in the downstream direction as in subsonic flows. More sound is produced in the upstream direction for thicker airfoils due to the non-uniform mean flow and shocks in the near field. The compensative effect makes the overall sound reduction by the airfoil thickness less than the subsonic cases despite the significant difference in the radiation patterns. The acoustic responses to the single frequency gusts are sensitive to the airfoil angle of attack in transonic flows. However, the overall differences are reduced when multiple wavenumber components are superposed in isotropic turbulence, and the sound pressure levels are therefore close as in subsonic flows. Similarly, the significant variations in single frequency acoustic responses by airfoil camber are averaged by the superposition of various wavenumber components. However, apparent variations are still found in the upstream direction, especially for the turbulences with small integral length scales.

Airfoil-gust interaction noise, Angle of attack, Camber, Geometry effect, Thickness, Transonic flow
1270-9638
181-191
Zhong, Siyang
414858d2-91b4-454c-957e-9280ed2e3a0f
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Gill, James
1e31eb24-f833-462e-b610-23b5b28e7285
Fattah, Ryu
b7fbaf19-132f-4a04-828e-6656b4d83f24
Sun, Yuhao
e7fcaa0d-bc1f-4550-b495-0dbf0a294e5c
Zhong, Siyang
414858d2-91b4-454c-957e-9280ed2e3a0f
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Gill, James
1e31eb24-f833-462e-b610-23b5b28e7285
Fattah, Ryu
b7fbaf19-132f-4a04-828e-6656b4d83f24
Sun, Yuhao
e7fcaa0d-bc1f-4550-b495-0dbf0a294e5c

Zhong, Siyang, Zhang, Xin, Gill, James, Fattah, Ryu and Sun, Yuhao (2019) Geometry effect on the airfoil-gust interaction noise in transonic flows. Aerospace Science and Technology, 92, 181-191. (doi:10.1016/j.ast.2019.06.006).

Record type: Article

Abstract

Numerical simulations are conducted to investigate the impacts of airfoil thickness, the angle of attack and camber on the airfoil-gust interaction noise in transonic flows where locally supersonic regimes and terminating shocks are present. The conclusions about the geometry effects based on the extensively studied subsonic cases are revisited. With the increase of airfoil thickness, the sound generation is reduced in the downstream direction as in subsonic flows. More sound is produced in the upstream direction for thicker airfoils due to the non-uniform mean flow and shocks in the near field. The compensative effect makes the overall sound reduction by the airfoil thickness less than the subsonic cases despite the significant difference in the radiation patterns. The acoustic responses to the single frequency gusts are sensitive to the airfoil angle of attack in transonic flows. However, the overall differences are reduced when multiple wavenumber components are superposed in isotropic turbulence, and the sound pressure levels are therefore close as in subsonic flows. Similarly, the significant variations in single frequency acoustic responses by airfoil camber are averaged by the superposition of various wavenumber components. However, apparent variations are still found in the upstream direction, especially for the turbulences with small integral length scales.

Full text not available from this repository.

More information

Accepted/In Press date: 2 June 2019
e-pub ahead of print date: 5 June 2019
Published date: 1 September 2019
Keywords: Airfoil-gust interaction noise, Angle of attack, Camber, Geometry effect, Thickness, Transonic flow

Identifiers

Local EPrints ID: 434184
URI: http://eprints.soton.ac.uk/id/eprint/434184
ISSN: 1270-9638
PURE UUID: 343a1bdd-4115-4765-83fc-b36b7bb5b5f2

Catalogue record

Date deposited: 13 Sep 2019 16:30
Last modified: 07 Oct 2020 00:38

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