Cooper, A. J. and Peake, N.. (2006) Transient growth and rotor-stator interaction noise in mean swirling duct flow. JOURNAL OF SOUND AND VIBRATION, 295 (3-5). pp. 553-570. ISSN 0022-460X

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Abstract

The phenomenon of spatial transient growth in swirling duct flow with application to aeroengine duct acoustics is investigated. In a typical aeroengine a region of swirling flow exists between the rotor and the downstream stator. The possibility for optimal transient growth of disturbance energy, and of a norm related to the acoustic power radiated back upstream from the stator is shown. Significant transient growth of both energy and noise norms can be observed over length scales relevant to aeroengine size, and over a wide range of parameter values such as the degree of mean swirl, azimuthal wavenumber and frequency. The optimal disturbances are found to have significant three dimensionality. The growth in energy results from increases in the azimuthal and radial components of the disturbance velocity field as it propagates downstream, whilst increases in the azimuthal velocity bring about non-modal growth of the noise measure. (c) 2006 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	JOURNAL OF SOUND AND VIBRATION
Publisher:	ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
ISSN:	0022-460X
Date:	22 August 2006
Volume:	295
Number:	3-5
Number of Pages:	18
Page Range:	pp. 553-570
Identification Number:	10.1016/j.jsv.2006.01.051
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/33311

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