Far field noise data were taken for convergent nozzles of various shapes and sizes at subsonic velocities exceeding 400 ft/sec. For a circular nozzle, the nozzle inlet shape and lip thickness had no effect on the noise level, directivity, or spectra when compared at the same nozzle exit diameter and peak exhaust velocity. A sharp edged orifice was one exception to this statement. Coannular nozzles can produce additional high frequency noise. Blunt ended centerbodies, where there is significant base drag, also generate significant additional noise.
The effect of nozzle inlet shape, lip thickness, and exit shape and size on subsonic jet noise.
Aerospace Sciences Meeting ; 1973 ; Washington, DC
01.01.1973
Aufsatz (Konferenz)
Keine Angabe
Englisch
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