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A nonintrusive laser interferometer method for measurement of skin frictionA method is described for monitoring the changing thickness of a thin oil film subject to an aerodynamic shear stress using two focused laser beams. The measurement is then simply analyzed in terms of the surface skin friction of the flow. The analysis includes the effects of arbitrarily large pressure and skin friction gradients, gravity, and time varying oil temperature. It may also be applied to three dimensional flows with unknown direction. Applications are presented for a variety of flows including two dimensional flows, three dimensional swirling flows, separated flow, supersonic high Reynolds number flows, and delta wing vortical flows.
Document ID
19830004123
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Monson, D. J. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
October 1, 1982
Subject Category
Instrumentation And Photography
Report/Patent Number
A-9077
NASA-TM-84300
NAS 1.15:84300
Accession Number
83N12393
Funding Number(s)
PROJECT: RTOP 506-51-11-08-00-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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