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A model for the pressure excitation spectrum and acoustic impedance of sound absorbers in the presence of grazing flow.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. One of the important implications of this model is that a multiple-degree-of-freedom resonator can be analyzed with grazing flow. Using the grazing flow pressure spectrum, the nonlinear acoustic resistance can be properly distributed among the several elements of the resonator.
Document ID
19730060028
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rice, E. J.
(NASA Lewis Research Center V/STOL and Noise Div., Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
AIAA PAPER 73-995
Meeting Information
Meeting: Aero-Acoustics Conference
Location: Seattle, WA
Start Date: October 15, 1973
End Date: October 17, 1973
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
73A44830
Distribution Limits
Public
Copyright
Other

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