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An improved method for predicting the effects of flight on jet mixing noiseA method for predicting the effects of flight on jet mixing noise has been developed on the basis of the jet noise theory of Ffowcs-Williams (1963) and data derived from model-jet/free-jet simulated flight tests. Predicted and experimental values are compared for the J85 turbojet engine on the Bertin Aerotrain, the low-bypass refanned JT8D engine on a DC-9, and the high-bypass JT9D engine on a DC-10. Over the jet velocity range from 280 to 680 m/sec, the predictions show a standard deviation of 1.5 dB.
Document ID
19790055790
Document Type
Conference Paper
Authors
Stone, J. R. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Subject Category
ACOUSTICS
Meeting Information
Acoustical Society of America, Meeting(Cambridge, MA)
Distribution Limits
Public
Copyright
Other