We have studied the influence of a non-Maxwellian velocity distribution of gas particles in the front of a shock wave on the mechanism of gas excitation and emission. Shock wave emission in a H$_2$:Ar mixture with a 1:99 concentration ratio has been studied experimentally at M=6 and a mechanism has been proposed for this emission. It is shown that the emission in these conditions is purely nonequilibrium. The importance of consideration of the non-Maxwellian distribution in the course of exothermal reactions in a gas has been emphasized.
Institute of Mechanics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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