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A theory, based on the same assumptions which are applied to incompressible flow, has been developed for the flow of a compressible fluid through sudden enlargements. Experimental measurements, with air as the working fluid, agree well with theoretical predictions for the relation between throat Mach number and the Mach number downstream of the sudden enlargement for the range of enlargement ratios 0.0292–0.255 and for throat Mach numbers up to 1.00.
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Hall et al. (1955) studied this question.
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