Studies in Very-High Mach Number Hydrodynamics
We present results of experiments on very-high Mach number (> 100) shocks and very-high Mach number and Reynolds number (> 100 × 106) turbulence, which are initiated with a powerful laser driver. In one experiment we examined laser-produced-shock solid-surface interactions and Mach stems and triple points, and also measured a new phenomenon termed a blast wave decursor. In a second experiment we found that shocks become unstable if they propagate through a gas which has a low adiabatic index and we measured the growth rate of the instability. In a third experiment we have shown that a high Mach number shock dramatically enhances the structure of a turbulent field through which it passes and that the shock itself is badly distorted. This result is unexpected since common wisdom has it that high Mach number shocks self-heal as they pass through a turbulent field.
Key wordLaser matter interaction Shock Turbulence Blast wave Shock instability
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