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RESEARCH PAPERS

Supersonic Jet Noise Reductions Predicted With Increased Jet Spreading Rate

[+] Author and Article Information
Milo D. Dahl

NASA Lewis Research Center, Cleveland, OH 44135

Philip J. Morris

Penn State University, University Park, PA 16802

J. Fluids Eng 120(3), 471-476 (Sep 01, 1998) (6 pages) doi:10.1115/1.2820686 History: Received December 29, 1995; Revised April 10, 1998; Online January 22, 2008

Abstract

In this paper, predictions are made of noise radiation from single, supersonic, axisymmetric jets. We examine the effects of changes in operating conditions and the effects of simulated enhanced mixing that would increase the spreading rate of the jet shear layer on radiated noise levels. The radiated noise in the downstream direction is dominated by mixing noise and, at higher speeds, it is well described by the instability wave noise radiation model. Further analysis with the model shows a relationship between changes in spreading rate due to enhanced mixing and changes in the far field radiated peak noise levels. The calculations predict that enhanced jet spreading results in a reduction of the radiated peak noise level.

Copyright © 1998 by The American Society of Mechanical Engineers
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