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Turbofan noise generation. Volume 2: Computer programsThe use of a package of computer programs developed to calculate the in duct acoustic mods excited by a fan/stator stage operating at subsonic tip speed is described. The following three noise source mechanisms are included: (1) sound generated by the rotor blades interacting with turbulence ingested into, or generated within, the inlet duct; (2) sound generated by the stator vanes interacting with the turbulent wakes of the rotor blades; and (3) sound generated by the stator vanes interacting with the velocity deficits in the mean wakes of the rotor blades. The computations for three different noise mechanisms are coded as three separate computer program packages. The computer codes are described by means of block diagrams, tables of data and variables, and example program executions; FORTRAN listings are included.
Document ID
19850003483
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Ventres, C. S.
(Bolt, Beranek, and Newman, Inc. Cambridge, MA, United States)
Theobald, M. A.
(Bolt, Beranek, and Newman, Inc. Cambridge, MA, United States)
Mark, W. D.
(Bolt, Beranek, and Newman, Inc. Cambridge, MA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1982
Subject Category
Acoustics
Report/Patent Number
NASA-CR-167952
NAS 1.26:167952
BBN-4770
Accession Number
85N11791
Funding Number(s)
CONTRACT_GRANT: NAS3-21252
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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