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Aeroacoustic sound generation in simple expansion chambers

Aeroacoustic sound generation in simple expansion chambers
Aeroacoustic sound generation in simple expansion chambers
A method is presented for measuring the aeroacoustic source strength in ducts with flow at frequencies at which the wave motion can be considered substantially one-dimensional. The method is based on coherent power flux measurements using pairs of microphones position both upstream and downstream of the source region. The method is applied to a flow exited expansion chamber with aeraoacoustic source measurements presented for chambers with a range of flow velocities and chamber lengths. The results indicate locked-on flow tones are generated on the chamber. The frequency of these lock-on flow tones is compared with that predicted using describing function theory applied to resonators with a grazing flow
aeroacoustics, cloud chambers, microphones
0001-4966
2589-2595
English, Emmet J.
164abd84-2c65-4664-87e2-4a2c15437340
Holland, Keith R.
90dd842b-e3c8-45bb-865e-3e7da77ec703
English, Emmet J.
164abd84-2c65-4664-87e2-4a2c15437340
Holland, Keith R.
90dd842b-e3c8-45bb-865e-3e7da77ec703

English, Emmet J. and Holland, Keith R. (2010) Aeroacoustic sound generation in simple expansion chambers. Journal of the Acoustical Society of America, 128 (5), 2589-2595. (doi:10.1121/1.3483735).

Record type: Article

Abstract

A method is presented for measuring the aeroacoustic source strength in ducts with flow at frequencies at which the wave motion can be considered substantially one-dimensional. The method is based on coherent power flux measurements using pairs of microphones position both upstream and downstream of the source region. The method is applied to a flow exited expansion chamber with aeraoacoustic source measurements presented for chambers with a range of flow velocities and chamber lengths. The results indicate locked-on flow tones are generated on the chamber. The frequency of these lock-on flow tones is compared with that predicted using describing function theory applied to resonators with a grazing flow

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More information

Published date: November 2010
Keywords: aeroacoustics, cloud chambers, microphones
Organisations: Fluid Dynamics & Acoustics Group

Identifiers

Local EPrints ID: 169103
URI: http://eprints.soton.ac.uk/id/eprint/169103
ISSN: 0001-4966
PURE UUID: 1235b255-ecc1-4d59-9c84-929e937ce142
ORCID for Keith R. Holland: ORCID iD orcid.org/0000-0001-7439-2375

Catalogue record

Date deposited: 10 Dec 2010 08:35
Last modified: 14 Mar 2024 02:19

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Contributors

Author: Emmet J. English
Author: Keith R. Holland ORCID iD

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