Upstream Pressure Induced MR-RR Shock Transitions
This study investigates the effect of upstream total pressure on shock transition from Mach reflection (MR) to regular reflection (RR). In the present work, the shock transitions in two geometric configurations are studied: (1) underexpanded confined jet and (2) convergent- divergent (C-D) nozzle with extended wall from the exit plane. The experimental study reveals that a MR shock structure is formed initially, for both cases, which then transforms to an RR with increase in primary jet total pressure. It was found that an increase in primary jet total pressure results in the downstream movement of the Mach stem with upstream Mach number and the shock angle of the first oblique shock leg in the MR remaining constant. This is in contradiction to the classical MR-RR transformations. The transformation in the present case is found to be a total pressure variation-induced transformation, which is a new kind of shock transformation.
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