Interferometric measurement of the density field around a cone in a stream of oxygen at approximately 10 000 ft/sec is reported. The test flow has been generated in an expansion tube, which utilizes an unsteady expansion for the purpose of total enthalpy multiplication. The experiment shows that vibrational equilibrium is achieved close behind the shock, while chemical relaxation occurs throughout the shock layer. The experimental density distribution and shock shape are compared with theoretical predictions, and good agreement is found.
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Spurk et al. (1966) studied this question.
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