Paul F. Brinich
An investigation was made to determine the effect of single and multiple two-dimensional roughness elements on the temperature distribution, the pressure distribution, and the heat transfer at Mach 3.1. A hollow cylinder and a cone-cylinder model were used. Abrupt perturbations in surface temperature occurred in the neighborhood of the elements when the boundary layer was turbulent, but were absent when it was laminar. The type of perturbation depended on the element shape, forward-facing wedges giving the lowest temperatures immediately behind the element and forward-facing steps the highest. For a turbulent boundary layer the heat-transfer rate behind the wedge element was less than that obtained immediately ahead of the element.
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