Active control of source sound power in uniform flow
Active control of source sound power in uniform flow
This paper is mainly a theoretical study of the minimum sound power radiated by two point volume velocity sources situated in an unbounded uniform fluid which moves with a uniform steady velocity. The paper also calculates the maximum sound power that can be absorbed by a point volume velocity source from an incident plane wave in a uniform flow field. The study is in response to the growing interest in applying active control to reduce the sound radiated from aircraft turbofan intakes on approach. For the idealised volume velocity source distribution used in this paper convection effects, to leading term, are found to be of order M2, where M is the Mach number. Mean flows with high subsonic Mach numbers are therefore found to cause a significant deterioration in the radiated sound power that can be reduced at a fixed source separation distance.
Aeoacoustics, Acoustic wave velocity measurement, Mach number velocity, radiated sound power
AIAA 96-1782
Joseph, P.
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Morfey, C. L.
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Nelson, P. A.
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1996
Joseph, P.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Morfey, C. L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Joseph, P., Morfey, C. L. and Nelson, P. A.
(1996)
Active control of source sound power in uniform flow.
2nd AIAA/CEAS Aeroacoustics Conference, 1996, , State College, United States.
06 - 08 May 1996.
.
(doi:10.2514/6.1996-1704).
Record type:
Conference or Workshop Item
(Paper)
Abstract
This paper is mainly a theoretical study of the minimum sound power radiated by two point volume velocity sources situated in an unbounded uniform fluid which moves with a uniform steady velocity. The paper also calculates the maximum sound power that can be absorbed by a point volume velocity source from an incident plane wave in a uniform flow field. The study is in response to the growing interest in applying active control to reduce the sound radiated from aircraft turbofan intakes on approach. For the idealised volume velocity source distribution used in this paper convection effects, to leading term, are found to be of order M2, where M is the Mach number. Mean flows with high subsonic Mach numbers are therefore found to cause a significant deterioration in the radiated sound power that can be reduced at a fixed source separation distance.
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Published date: 1996
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Publisher Copyright:
© 1996, American Institute of Aeronautics and Astronautics, Inc.
Scopus Copyright 2017 Elsevier B.V., All rights reserved.
Venue - Dates:
2nd AIAA/CEAS Aeroacoustics Conference, 1996, , State College, United States, 1996-05-06 - 1996-05-08
Keywords:
Aeoacoustics, Acoustic wave velocity measurement, Mach number velocity, radiated sound power
Identifiers
Local EPrints ID: 467717
URI: http://eprints.soton.ac.uk/id/eprint/467717
PURE UUID: 78f97005-28df-40b7-ad62-d004a95f2e4a
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Date deposited: 20 Jul 2022 16:31
Last modified: 17 Mar 2024 02:32
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Author:
C. L. Morfey
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