NDLI: Skin friction measurements by a dual-laser-beam interferometer technique

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Skin friction measurements by a dual-laser-beam interferometer technique

Content Provider	NASA Technical Reports Server (NTRS)
Author	Monson, D. J. Higuchi, H.
Copyright Year	1981
Description	A portable dual-laser-beam interferometer that nonintrusively measures skin friction by monitoring the thickness change of an oil film subject to shear stress is described. The method is an advance over past versions in that the troublesome and error-introducing need to measure the distance to the oil leading edge and the starting time for the oil flow has been eliminated. The validity of the method was verified by measuring oil viscosity in the laboratory, and then using those results to measure skin friction beneath the turbulent boundary layer in a low speed wind tunnel. The dual-laser-beam skin friction measurements are compared with Preston tube measurements, with mean velocity profile data in a "law-of-the-well" coordinate system, and with computations based on turbulent boundary-layer theory. Excellent agreement is found in all cases. (This validation and the aforementioned improvements appear to make the present form of the instrument usable to measure skin friction reliably and nonintrusively in a wide range of flow situations in which previous methods are not practical.)
File Size	589134
Page Count	7
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980032581
Archival Resource Key	ark:/13960/t4tj3b82p
Language	English
Publisher Date	1981-06-01
Access Restriction	Open
Subject Keyword	Lasers And Masers Viscosity Oils Skin Friction Turbulent Boundary Layer Friction Measurement Low Speed Wind Tunnels Laser Beams Pitot Tubes Interferometers Nonintrusive Measurement Shear Stress Portable Equipment Data Correlation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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