Influence of refraction on the applicability of the Zehnder-Mach interferometer to studies of cooled boundary layers

Martin R. Kinsler
naca-tn-2462
Sep 1951


In order to determine the applicability of the Zehnder-Mach interferometer to two-dimensional cooled-boundary-layer studies, an analytical investigation was conducted. It was found that for low wall to free-stream temperature ratios, the effects of light refraction may cause considerable error in the boundary-layer density profiles calculated from interferogram measurements if these effects are not taken into account and that it is impossible to observe the boundary layer very close to the cooled wall.

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