Cooper, A. J.. (2006) Effect of mean entropy on unsteady disturbance propagation in a slowly varying duct with mean swirling flow. Journal of Sound and Vibration, Vol.291 (No.3-5). pp. 779-801. ISSN 0022-460X

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Abstract

The propagation of acoustic disturbances in a slowly-varying duct with mean swirling flow and nonuniform mean entropy is considered. This is representative of the region of swirling flow downstream of the rotor in aeroengine applications where variations in mean entropy can be significant. The duct is assumed to vary slowly in axial cross section and a consistent multiple-scales solution is derived. The variation in axial wavenumber and amplitude of the duct modes is determined as part of the solution. Comparisons are made between the cases of isentropic and non-isentropic flow. The cut-on/cut-off characteristics of a given mode are altered by any form of non-uniform mean entropy, with modes pushed closer to cut-off resulting in larger variations in amplitude. The greatest departure from the baseline isentropic result occurs for a positive entropy gradient. Increasing the swirl velocity at the duct inlet leads to increasing levels of mean entropy. (c) 2005 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
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Journal of Sound and Vibration
Publisher:	Elsevier Ltd.
ISSN:	0022-460X
Date:	4 April 2006
Volume:	Vol.291
Number:	No.3-5
Number of Pages:	23
Page Range:	pp. 779-801
Identification Number:	10.1016/j.jsv.2005.06.041
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/33790

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