EXPERIMENTAL AND NUMERICAL NONEQUILIBRIUM FLOW STUDIES
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD ABERDEEN PROVING GROUND
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Experimental and numerical studies of the nonequilibrium shock layer around cones in hypersonic pure oxygen flows are reported. Experimental conditions are such that rotational, vibrational and dissociation relaxation occur simultaneously. Attention is given to the effect of coupled relaxation on the flow properties in the shock layer. The phenomenological models of Hammerling, et al, and Treanor and Marrone predict the flow field qualitatively correct. However, quantitative differences in shock geometry and density distribution are appreciable. Better quantitative agreement with experiment is reached in these models a temperature dependent efficiency of O2 and O in the relaxation processes is assumed.