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Record Details

Record 64 of 21893
Sound generation and upstream influence due to instability waves interacting with non-uniform mean flows
Author and Affiliation:
Goldstein, M. E.(NASA Lewis Research Center, Cleveland, OH, United States)
Abstract: Attention is given to the sound produced by artificially excited, spatially growing instability waves on subsonic shear layers. Real flows that always diverge in the downstream direction allow sound to be produced by the interaction of the instability waves with the resulting streamwise variations of the flow. The upstream influence, or feedback, can interact with the splitter plate lip to produce a downstream-propagating instability wave that may under certain conditions be the same instability wave that originally generated the upstream influence. The present treatment is restricted to very low Mach number flows, so that compressibility effects can only become important over large distances.
Publication Date: Dec 01, 1984
Document ID:
19850038587
(Acquired Nov 28, 1995)
Accession Number: 85A20738
Subject Category: ACOUSTICS
Document Type: Journal Article
Publication Information: Journal of Fluid Mechanics (ISSN 0022-1120); 149; 161-177
Publisher Information: United Kingdom
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: NONUNIFORM FLOW; SHEAR LAYERS; SOUND GENERATORS; SUBSONIC FLOW; WAVE INTERACTION; COMPUTATIONAL FLUID DYNAMICS; FAR FIELDS; IDEAL GAS; INCOMPRESSIBLE FLOW; INVISCID FLOW; NEAR FIELDS; NOZZLE FLOW; TURBULENT MIXING; UPSTREAM
Imprint And Other Notes: Journal of Fluid Mechanics (ISSN 0022-1120), vol. 149, Dec. 1984, p. 161-177.
Availability Source: Other Sources
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