Calculations have been made of the initial portion of the boundary of axisymmetric free Jets exhausting at large ratios of jet static pres-sure to stream static pressure from a conically divergent nozzle having a jet exit Mach number of 2.5 and a semidivergence angle of 15°. The results of the calculations indicate the size and shape of the jet to be expected at large pressure ratios, the effects of the ratio of spe¬cific heats, and the large Initial inclinations of the boundary that are likely to be encountered by hypersonic vehicles at high altitude.
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