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Re-examination of compliant wall experiments in air with water substratesA possible alternative explanation is proposed for compliant wall drag reductions measured in previous investigations. Standing waves were observed to form on the surfaces of compliant wall models in air with water substrates as the freestream velocity was increased from 15 to 30 m/s. These waves resembled sine waves with half of the wave protruding over the upstream portion of the model and the other half being recessed over the downstream end of the model. These data coupled with results of recent drag reduction experiments suggest that standing waves could have caused a shift in the model center of gravity creating a bending moment that was interpreted as a reduction in the skin friction drag.
Document ID
19760057155
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hefner, J. N.
(NASA Langley Research Center Hampton, VA, United States)
Weinstein, L. M.
(NASA Langley Research Center High-Speed Aerodynamics Div., Hampton, Va., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1976
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 13
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
76A40121
Distribution Limits
Public
Copyright
Other

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