The observed aeroacoustic behaviour of some flow-excited expansion chambers
The observed aeroacoustic behaviour of some flow-excited expansion chambers
Expansion chambers are often installed in flow duct systems to reduce pressure pulsations and to act as silencers. However, in certain circumstances they can become flow-excited sound generators rather than attenuators. The physics of the flow acoustic interactions responsible for this are examined in detail. They are then illustrated by a systematic sequence of sound power flux measurements in the downpipe, expansion chamber and tailpipe of some representative examples. These measurements then identify both the position and spectral characteristics of the sources of sustained excitation by the flow in its relation to the local geometry and its associated reverberant acoustic behaviour.
695-708
Davies, P.O.A.L.
e2de24e0-483d-49fb-ad50-703548232c61
Holland, K.R.
90dd842b-e3c8-45bb-865e-3e7da77ec703
25 January 2001
Davies, P.O.A.L.
e2de24e0-483d-49fb-ad50-703548232c61
Holland, K.R.
90dd842b-e3c8-45bb-865e-3e7da77ec703
Davies, P.O.A.L. and Holland, K.R.
(2001)
The observed aeroacoustic behaviour of some flow-excited expansion chambers.
Journal of Sound and Vibration, 239 (4), .
(doi:10.1006/jsvi.2000.3223).
Abstract
Expansion chambers are often installed in flow duct systems to reduce pressure pulsations and to act as silencers. However, in certain circumstances they can become flow-excited sound generators rather than attenuators. The physics of the flow acoustic interactions responsible for this are examined in detail. They are then illustrated by a systematic sequence of sound power flux measurements in the downpipe, expansion chamber and tailpipe of some representative examples. These measurements then identify both the position and spectral characteristics of the sources of sustained excitation by the flow in its relation to the local geometry and its associated reverberant acoustic behaviour.
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Published date: 25 January 2001
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Local EPrints ID: 10201
URI: http://eprints.soton.ac.uk/id/eprint/10201
ISSN: 0022-460X
PURE UUID: 1cf34ead-52c9-40a3-9a92-f2e583668603
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Date deposited: 09 May 2005
Last modified: 15 Mar 2024 04:58
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Author:
P.O.A.L. Davies
Author:
K.R. Holland
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