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Theoretical prediction of nonlinear propagation effects on noise signatures generated by subsonic or supersonic propeller or rotor-blade tipsThe nonlinear propagation equations for sound generated by a constant speed blade tip are presented. Propagation from a subsonic tip is treated as well as the various cases that can occur at supersonic speeds. Some computed examples indicate that the nonlinear theory correlates with experimental results better than linear theory for large amplitude waves. For swept tips that generate a wave with large amplitude leading expansion, the nonlinear theory predicts a cancellation effect that results in a significant reduction of both amplitude and impulse.
Document ID
19800013778
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Barger, R. L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
NASA-TP-1660
L-13388
Accession Number
80N22265
Funding Number(s)
PROJECT: RTOP 533-01-43-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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