Abstract
The paper describes an experimental study of the thermal protection of a surface, in hypersonic flow, by tangential injection of a coolant through a slot with laminar flow prevailing throughout. Heat-transfer measurements were taken on a flat plate in a gun tunnel under isothermal wall conditions and the effect of slot height, streamwise position of slot, flow conditions, and differing coolant gases were examined. A simple discrete layer theory was found to give fair agreement with the experiments. Optimizations of cooling effectiveness using this theory showed that hydrogen was likely to be the most efficient gas for constant mass injection rate.
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