THE THICKNESS OF SHOCK AND DETONATION FRONTS AND ROTATIONAL RELAXATION AT HIGH TEMPERATURES
PRINCETON UNIV NJ FRICK CHEMICAL LAB
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Optical reflectivity measurements of shock thickness in Ar have been extended to much higher CH NUMB RS. Earlier shock thick ss measurements at Mach numbers up to 1.55 were found to be in good agreement with Navier-Stokes theory. The present measurements show that this agreement becomes progressively less good as the Mach number increases. The shock thickness in Ar appears to reach a maximum at about M 3 on the basis of preliminary experiments conducted at M 4.99 where the observed thickness agrees with the bimodal model of Muckenfuss. The optical reflectivity methods also been applied to H-O e onations and strong shock fronts in pur O. These measurements suggest that rotational relaxation, which is known to be rapid at low temperatures, may b come slow at high temperatures. It also appears that in detonation waves heating effects may extend into the region of the initial compression process.