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Radiation of cylindrical duct acoustic modes with flow mismatchCalculations for the radiation of spinning acoustic modes, with or without a centerbody, and with or without flow temperature and velocity discontinuity, are presented. Solutions to the appropriate convected wave equations devised around Fourier transforms and Wiener-Hopf technique are presented. The decomposition of the asymmetric kernel, resulting from a flow and temperature mismatch, is carried out in part exactly and partially using the so-called Carrier-Koiter approximation procedure. The resulting solutions offer a good approximation to the radiation of both symmetric and asymmetric modes through a flow discontinuity represented as a plug flow jet issuing from a cylindrical duct. Besides the Koiter approximation, the major limitation on the calculation program is the difficulty of calculating the high order Bessel functions with sufficient accuracy.
Document ID
19750011994
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Savkar, S. D.
(General Electric Co. Schenectady, NY, United States)
Edelfelt, I. H.
(General Electric Co. Schenectady, NY, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1975
Subject Category
Acoustics
Report/Patent Number
NASA-CR-132613
SRD-75-029
Accession Number
75N20066
Funding Number(s)
CONTRACT_GRANT: NAS1-11984
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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