Candel, S. M. (1973) Acoustic radiation from the end of two-dimensional duct, effects of uniform flow and duct lining. Journal of Sound and Vibration , 28 (1). pp. 1-13. ISSN 0022-460X. http://resolver.caltech.edu/CaltechAUTHORS:20101214-111254699
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A study is presented of the radiation of acoustic modes from the end of a duct immersed in a uniformly moving medium. It is shown that the uniform flow has roughly the same effect as an increase in frequency at constant mode number: the number of lobes of the radiation pattern increases, and the radiation maximum is slightly displaced towards the duct axis. When the mode is near cut-off the forward radiation for an inlet is enhanced. The acoustic radiation characteristics of ducts with soft or absorbing walls and hard, perfectly-reflecting walls are then compared. It is shown, and this is of technological interest, that the side radiation from the end of an acoustically soft duct is greatly reduced for lower-order modes.
|Additional Information:||© 1973 Elsevier. Received 18 September 1972. The author is grateful to Professor Frank E. Marble for helpful discussion and criticism of the present work.|
|Group:||Guggenheim Jet Propulsion Center|
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|Official Citation:||Acoustic radiation from the end of two-dimensional duct, effects of uniform flow and duct lining Original Research Article Pages 1-13 S.M. Candel|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||15 Dec 2010 18:57|
|Last Modified:||26 Dec 2012 12:45|
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