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Compliant wall-turbulent skin-friction reduction researchPrevious compliant-wall experiments successful in reducing skin-friction drag probably have had a (unplanned) membrane resonance at a favorable frequency, amplitude, wave shape, length, and speed. The most probable drag reduction mechanism involves a direct coupling between the fluid and the moving wall when the wall natural resonance frequencies are near the fundamental turbulent burst frequency. Local skin-friction reductions of 61% were measured with mylar/PVC plastisol compliant surfaces. These reductions were observed only at certain flow conditions, indicating that changing tunnel total temperature may have altered the substrate dynamic modulus, damping, and coupled mylar tension. Apparently, the coupled membrane/substrate must be excited in compatible narrow-band natural frequency modes. An accelerated effort is required to develop practical durable compliant surfaces optimized for maximum drag reduction. Application of compliant walls to other transportation modes appears feasible with liquid flows offering the greatest skin-friction drag reduction potential.
Document ID
19750049858
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fischer, M. C.
Weinstein, L. M.
Bushnell, D. M.
(NASA Langley Research Center Hampton, Va., United States)
Ash, R. L.
(Old Dominion University Norfolk, Va., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1975
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 75-833
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference
Location: Hartford, CT
Start Date: June 16, 1975
End Date: June 18, 1975
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
75A33930
Distribution Limits
Public
Copyright
Other

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