Abstract
The optical reflectivity technique has been used to study the structure of detonation waves in H2:3O2 at initial pressures of 20 to 40 psia. The detonation fronts were found to be comparable to those of normal shock waves in their thickness and planarity. The density change across the front appears to be less than the theoretical value, suggesting that rotational relaxation of oxygen (and hydrogen) in the front may not be complete. Experiments on shock waves in oxygen at M=3.0, where the final temperature is 872°K, confirm the rotational heat capacity lag and suggest that rotational relaxation is much slower at high temperatures than at room temperature.
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