Precursor evolution during the interaction of a shock wave with a low-density layer

Some characteristics of precursor evolution during the interaction of a shock wave with a low-density layer are examined with reference to detailed numerical calculations and results of specially designed experiments. In particular, the precursor velocity and the mean values of gasdynamic parameters within the precursor are estimated by using a simple expression and integral balances of mass, momentum, and energy. It is shown that by changing gas density in a thin surface layer, it is possible to control the entire gasdynamic motion. An experiment is described in which a shock wave in a gas was generated by a short laser pulse on the surface of a tantalum plate.