Acceleration of particles by a supercompressed detonation wave

Abstract

The supercompression of a detonation wave is accompanied by a sharp increase in the pressure, density, and velocity of the detonation products (DP). Powder particles introduced in the DP flow can be dispersed to large velocities over small distances, despite the transitory existence of strong supercompression. One technique shown in this paper for creating a supercompressed (underexpanded) wave is by suitable profiling of the tube cross section. The generation of a supercompressed wave can take place in the irregular, quasiregular, and regular regimes. An analysis of the experimental results presented here shows that the maximum supercompression in the quasiregular reflection of a Chapman-Jouguet detonation from the walls of the cone is 12-15% if the length of the shaping section is more than six times its diameter, regardless of the cone angle and the diameters of the narrow and wide parts of the channel. The velocity of solid particles accelerated by the DP in the wake of a supercompressed wave is three or four times the velocity of the same particles accelerated by the products after a Chapman-Jouguet wave.