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JET Noise PredictionAerodynamic noise prediction has been an important and challenging research area since James Lighthill first introduced his Acoustic Analogy Approach over fifty years ago. This talk attempts to provide a unified framework for the subsequent theoretical developments in this field. It assumes that there is no single approach that is optimal in all situations and uses the framework as a basis for discussing the strengths weaknesses of the various approaches to this topic. But the emphasis here will be on the important problem of predicting the noise from high speed air jets. Specific results will presented for round jets in the 0.5 to 1.4 Mach number range and compared with experimental data taken on the Glenn SHAR rig. It is demonstrated that non-parallel mean flow effects play an important role in predicting the noise at the supersonic Mach numbers. The results explain the failure of previous attempts based on the parallel flow Lilley model (which has served as the foundation for most jet noise analyses during past two decades).
Document ID
20080005574
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Goldstein, M. E. (NASA Glenn Research Center Cleveland, OH, United States)
Leib, S. J. (Ohio Aerospace Inst. OH, United States)
Date Acquired
August 24, 2013
Publication Date
December 4, 2007
Subject Category
Acoustics
Meeting Information
Meeting: Fall 2007 Acoustics Technical Working Group Meeting
Location: Cleveland, OH
Country: United States
Start Date: December 4, 2007
End Date: December 5, 2007
Funding Number(s)
WBS: WBS 984754.02.07.03.17.04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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