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Response of a subsonic nozzle to acoustic and entropy disturbances

Bohn, M. S. (1977) Response of a subsonic nozzle to acoustic and entropy disturbances. Journal of Sound and Vibration, 52 (2). pp. 283-297. ISSN 0022-460X. doi:10.1016/0022-460X(77)90647-2.

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The one-dimensional response of a subsonic nozzle flow to small pressure and entropy disturbances is calculated. The response is expressed in terms of transmitted acoustic waves (which propagate from the nozzle in the same direction as the disturbance wave) and reflected acoustic waves (which propagate from the nozzle in the direction opposite to that of the disturbance wave) for three independent disturbances: a downstreampropagating acoustic wave impinging upon the nozzle inlet, an upstream-propagating wave impinging upon the nozzle exit, and an entropy wave convecting through the nozzle. The solution for high frequency disturbances is discussed and used with the compact (long wavelength disturbance) solution to normalize several numerical calculations. The normalization shows that the transmitted waves created by the two acoustic disturbances may be represented by the same function offrequency for a given inlet and exit nozzle Mach number. The same is seen to be true for the reflected waves created by the two acoustic disturbances. The normalization allows results for a wide range of nozzle Mach number distributions and disturbance frequencies to be presented concisely.

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Additional Information:© 1977 Published by Elsevier Ltd. Received 22 June 1976, and in revised form 13 January 1977. Available online 29 July 2003. The author wishes to express his appreciation to Dr N. Cumpsty of Cambridge University for suggesting this problem, and to Professor F. E. Marble of the California Institute of Technology for his many helpful discussions of the problem.
Group:Guggenheim Jet Propulsion Center
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20101213-104516314
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Official Citation:Bohn, M. S. (1977). "Response of a subsonic nozzle to acoustic and entropy disturbances." Journal of Sound and Vibration 52(2): 283-297.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21315
Deposited By: Ruth Sustaita
Deposited On:14 Dec 2010 17:15
Last Modified:09 Nov 2021 00:07

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