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A model for the pressure excitation spectrum and acoustic impedance of sound absorbers in the presence of grazing flowThe acoustic impedance of sound absorbers in the presence of grazing flow is essential information when analyzing sound propagation within ducts. A unification of the theory of the nonlinear acoustic resistance of Helmholtz resonators including grazing flow is presented. The nonlinear resistance due to grazing flow is considered to be caused by an exciting pressure spectrum produced by the interaction of the grazing flow and the jets flowing from the resonator orifices. With this exciting pressure spectrum the resonator can be treated in the same manner as a resonator without grazing flow but with an exciting acoustic spectrum.
Document ID
19730021499
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rice, E. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
E-7656
NASA-TM-X-71418
Meeting Information
Meeting: Aero-Acoustics Conf.
Location: Seattle, WA
Country: United States
Start Date: October 15, 1973
End Date: October 17, 1973
Sponsors: AIAA
Accession Number
73N30231
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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