The position of the sonic line and the pressure distribution over the wedge have been calculated from the density fields measured with a Mach-Zehnder interferometer. For a given wedge, identical pressure distributions are found over a considerable range of supersonic flows. These results suggest simple formulas giving the drag coefficient for each wedge angle which are expected to hold in most of the transonic speed range.
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Wayland Griffith (1952) studied this question.
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