AN INVESTIGATION OF SUPERSONIC TURBULENT BOUNDARY LAYERS ON SLENDER BODIES OF REVOLUTION IN FREE FLIGHT BY USE OF A MACH-ZEHNDER INTER--FEROMETER AND SHADOWGRAPHS

摘要

Slender bodies of revolution in free flight at Mach numbers of 3.2 and 3.6 were photographed in a Mach-Zehnder interferometer and the pic¬tures were analyzed to obtain the turbulent-boundary-layer density distributions for the case of a body surface cold compared to recovery temperature. The density distributions obtained, when averaged, were found to be similar to those given by a theoretical equation of Crocco for a wide range of assumed velocity profiles. The average heat-transfer coef¬ficients of the boundary layers also were obtained by an energy balance computation from the measured density distributions and measurements of the boundary-layer thickness, with the assumption that the velocity pro¬file could be represented by a power law. The heat-transfer rates obtained could be adequately predicted by the T method for estimating skin friction together with the modified Reynolds analogy.