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Sound radiation from a bypass duct with bifurcations

Sound radiation from a bypass duct with bifurcations
Sound radiation from a bypass duct with bifurcations
The influence of bifurcations in an aeroengine bypass duct on noise radiation was investigated through high-orderaccurate
three-dimensional numerical simulations. The physical process was described by a set of acoustic
perturbation equations. Four bifurcation arrangements with an airfoil cross section were regularly placed in
circumferential direction. Results were compared with those of an axisymmetric duct case without the installation of
bifurcations. Both near-field propagation and far-field radiation were studied to show that the bifurcations scatter
acoustic modes and redirect sound propagation levels. Compared to the axisymmetric duct case, there are a couple of
decibel increases in sound pressure level on some angles due to the installation of bifurcations. The method is also
applicable to other configurations with different bifurcations and modes
0001-1452
429-436
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Huang, X.
44c6d7c9-07ca-436c-9cbe-1ba9a2f834f9
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Huang, X.
44c6d7c9-07ca-436c-9cbe-1ba9a2f834f9
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421

Chen, X.X., Huang, X. and Zhang, X. (2009) Sound radiation from a bypass duct with bifurcations. AIAA Journal, 47 (2), 429-436. (doi:10.2514/1.39710).

Record type: Article

Abstract

The influence of bifurcations in an aeroengine bypass duct on noise radiation was investigated through high-orderaccurate
three-dimensional numerical simulations. The physical process was described by a set of acoustic
perturbation equations. Four bifurcation arrangements with an airfoil cross section were regularly placed in
circumferential direction. Results were compared with those of an axisymmetric duct case without the installation of
bifurcations. Both near-field propagation and far-field radiation were studied to show that the bifurcations scatter
acoustic modes and redirect sound propagation levels. Compared to the axisymmetric duct case, there are a couple of
decibel increases in sound pressure level on some angles due to the installation of bifurcations. The method is also
applicable to other configurations with different bifurcations and modes

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More information

Published date: February 2009
Organisations: Aerodynamics & Flight Mechanics, Engineering Sciences

Identifiers

Local EPrints ID: 148523
URI: https://eprints.soton.ac.uk/id/eprint/148523
ISSN: 0001-1452
PURE UUID: 688a425c-813d-4974-926f-b856fef2bfa4

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Date deposited: 28 Apr 2010 10:59
Last modified: 17 Jul 2019 00:03

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