An improved method for predicting the effects of flight on jet mixing noise

Stone, J. R.

A 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

Meeting Information

Acoustical Society of America, Meeting(Cambridge, MA)

Distribution Limits

Public

Other

NTRS

NTRS - NASA Technical Reports Server