Pressure distributions on circular cylinders have been measured in arc-heated and perfect gas wind tunnels. The flow Mach numbers were near 7 at Reynolds numbers based on cylinder diameter from l60 to 1000. The stagnation enthalpies varied from 250 to 5050 BTU/lbm. For locations on the cylinder beyond 20° from the stagnation point, the pressures determined in the perfect gas tunnel were found to be higher than those obtained from the arc-heated wind tunnel. Various possible causes for the discrepancies in pressures are examined. The results indicate the possible existence of rotational non-equilibrium in the cylinder shock layer for the high enthalpy tests.
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