Skin-friction measurements by laser interferometryThe measurement of skin friction in rapidly distorted compressible flows is difficult, and very few reliable techniques are available. A recent development, the laser interferometer skin friction (LISF) meter, promises to be useful for this purpose. This technique interferometrically measures the time rate of thinning of an oil film applied to an aerodynamic surface. Under the proper conditions the wall shear stress may thus be found directly, without reference to flow properties. The applicability of the LISF meter to supersonic boundary layers is examined experimentally. Its accuracy and repeatability are assessed, and conditions required for its successful application are considered.
Document ID
19890019366
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Kim, K.-S. (Pennsylvania State Univ. University Park, PA, United States)
Settles, G. S. (Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1989
Publication Information
Publication: AGARD, A Survey of Measurements and Measuring Techniques in Rapidly Distorted Compressible Turbulent Boundary Layers