Numerical Investigation of High-Enthalpy Flows Generated by Expansion Tube

We have investigated by numerical simulation the hypersonic and high-enthalpy flows around a reentry body, which Sasoh et al. examined experimentally in an expansion tube facility. For the experiment, the evaluation of the timing at which the test flow is attained and the freestream condition ofthe test flow are the most crucial issues. Therefore, it was necessary to validate these issues in another way, rather than the simple estimation by Sasoh et al. based on the pressure and spectral emission measurements. Thus, the experimental result was intensively investigated compared to the numerical result based on the experimentally determined freestream condition

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