Abstract
An experimental investigation has been carried out to examine heat-transfer characteristics of an axisymmetric, underexpanded, sonic jet impinging on a flat plate. The ratio of nozzle-exit pressure to the ambient pressure, that is, underexpansion ratio ranges from 1.5 to 3.5, and the distance from the nozzle exit to the plate is adjusted from 0.5 to 20.0 nozzle-exit diameters. Detailed measurements of the recovery factor and the surface pressure on the flat plate have been achieved
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