Author(s)

LIU JUN, FU ZHENG, WANG PEI, YAO WEN, QIAN JIAN-ZHEN

Abstract

When two head-on sliding detonation waves collide, some complex dynamical phenomena such as spallation and micro-jet always appear in the collision region of a metal tube, which cause its reliability to decrease. In the cylindrical implosion of lead/aluminum two layers tube, simulation results of the inner surface travel times of lead coincide well with the experimental results. In the polar position, there is a fracture cavity in the lead flyer, and a blunt bulge is formed on the inner surface. At the equator, large-scale fracture particles are generated as the inner surface of the lead flyer is growing. It is considered that the colliding bulge at the equator which seems to be continuous in the X-ray images is actually discontinuous, and it is composed of large-scale fracture particles and small-scale micro-jet particles. High-pressure Mach stem’s fist impact in metal is considered as the main reason of the behavior of collision-bulging. And then, in order to avoid collision-bulging, high impedance metal iridium is used as a similar-rigid-control-block. Backward facing step model and regular reflection model are also designed to make the first shock wave intensity weakened in evidence in collision zone. Finally, the backward facing step model of lead and aluminum flyers driven by sliding detonation is simulated, and the influence of different length of model is analyzed. The simulation results show that the suppressing efficiency is enhanced to some extent while adjusting the length of control-block, and the suppression block does not affect the subsequent implosion process fly.

Keywords

detonation driven, colliding bulge, micro-jet, metal flyers