Acoustic radiation from the end of two-dimensional duct, effects of uniform flow and duct lining
- Creators
- Candel, S. M.
Abstract
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.Attached Files
Published - 211_Candel_SM_1973.pdf
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Additional details
- Eprint ID
- 21353
- Resolver ID
- CaltechAUTHORS:20101214-111254699
- Created
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2010-12-15Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Guggenheim Jet Propulsion Center
- Other Numbering System Name
- Guggenheim Jet Propulsion Center