Abstract
A numerical analysis was carried out to study the interaction of the reflected shock with incident boundary layer and contact surface in reflected shock tunnels and the driver gas contamination of the hot flow, in tailored conditions. Navier-Stokes equations were solved with a multiblock finite volume method in a shock tube and a nozzle. Different suction devices, such as a corner slit, a corner slit prolongated by a sleeve, and a conical ring, were tested for their capability of delaying this contamination effect. The results show that the driver gas passes through a bifurcated shock foot as a jet and causes premature contamination of the driven gas. They also show why the suction induced by a corner slit is inefficient for delaying the contamination. Located just behind the bifurcated shock foot after the shock/interface interaction, the sleeve device captures driver gas upstream and leads to an improvement in the driver gas arrival time by a factor of 1.8. Finally, based on the present numerical investigation, a new conical ring device is proposed, with a horizontal and vertical suction, which further increases this factor to 2.5
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