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The acoustics of aircraft engine-duct systemsNoise generated in aircraft engines is usually suppressed by acoustically treating the engine ducts. The optimization of this treatment requires an understanding of the transmission and attenuation of the acoustic waves. A critical review is presented of the state of the art regarding methods of determining the transmission and attenuation parameters and the effect on these parameters of (1) acoustic properties of liners, (2) the mean velocity, including uniform and shear profiles and nonparallel flow, (3) axial and transverse temperature gradients, (4) slowly and abruptly varying cross sections, and (5) finite-amplitude waves and nonlinear duct liners.
Document ID
19740029465
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nayfeh, A. H.
Kaiser, J. E.
Telionis, D. P. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1973
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 73-1153
Meeting Information
Meeting: Aeronautical Meeting
Location: Montreal
Country: Canada
Start Date: October 29, 1973
End Date: October 30, 1973
Sponsors: Canadian Aeronautics and Space Institute, American Institute of Aeronautics and Astronautics
Accession Number
74A12215
Funding Number(s)
CONTRACT_GRANT: NGR-47-004-109
Distribution Limits
Public
Copyright
Other

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