Abstract
Flow characterization experiments of stagnation enthalpies up to 37 MJ/kg are carried out in the recently commissioned expansion tube facility. The features and the effective duration time of the test flowfield are determined not only from static and pitot pressures but also by observing the temporal variation of radiating emission from a shock layer around a spherical forebody. The thickness of the radiating layer matches well with the numerical results. The arrival time of the contact surface between the acceleration and test gases is better identified both as a decrease in the radiating layer thickness and from the emission spectroscopy. The useful test time is determined by integrating the mentioned measurements
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