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The effect of nozzle inlet shape, lip thickness, and exit shape and size on subsonic jet noiseFar field noise data were taken for convergent nozzles of various shapes and sizes at subsonic velocities exceeding 400 feet per second. 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 total noise power generation was essentially the same for circular, slot, and plug nozzles of good aerodynamic shape. The noise radiation patterns were essentially the same for these nozzle shapes except near the nozzle exhaust axis.
Document ID
19730007928
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Olsen, W. A. (NASA Lewis Research Center Cleveland, OH, United States)
Gutierrez, O. A. (NASA Lewis Research Center Cleveland, OH, United States)
Dorsch, R. G. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
Physics, General
Report/Patent Number
E-7289
NASA-TM-X-68182
Meeting Information
Meeting: Aerospace Sci. Meeting
Location: Washington, D. C.
Country: United States
Start Date: January 10, 1973
End Date: January 12, 1973
Sponsors: Am. Inst. of Aeron. and Astronaut.
Accession Number
73N16655
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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