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Low-frequency pressure fluctuations in axisymmetric turbulent boundary layersMeasurements were made of wall pressure fluctuations under a turbulent boundary layer on the fuselage of a sailplane. Experiments with the sailplane offered a noise-free flow with a low free-stream turbulence level. In this environment the wall-pressure spectrum of a turbulent boundary layer with natural transition was found to drop off at low frequencies. Correlations between several wall-mounted microphones revealed that the large-scale motions contribute about 35% to the mean square pressure. Velocity fluctuations at several positions within and outside the boundary layer were measured and correlated with the wall pressure. It seems that the irrotational motions in the turbulent region are primarily responsible for the large-scale wall-pressure fluctuations. A time-lagged conditional correlation of the pressure was introduced to gain further insight into the pressure-producing motions.
Document ID
19800044373
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Panton, R. L.
(Texas Univ. Austin, TX, United States)
Goldman, A. L.
(Texas, University Austin, Tex., United States)
Lowery, R. L.
(Texas Univ. Austin, TX, United States)
Reischman, M. M.
(Oklahoma State University Stillwater, Okla., United States)
Date Acquired
August 10, 2013
Publication Date
March 25, 1980
Publication Information
Publication: Journal of Fluid Mechanics
Volume: 97
Subject Category
Aerodynamics
Accession Number
80A28543
Funding Number(s)
CONTRACT_GRANT: NGR-37-002-083
CONTRACT_GRANT: NSG-2189
CONTRACT_GRANT: NGR-44-012-221
Distribution Limits
Public
Copyright
Other

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