Formation features of cylindrical detonation wave at multipoint initiation

Abstract

The experimental results showing the formation features of a cylindrical detonation wave with a multipoint initiation are presented in this work. One of the main features of the process is the presence of the “nodes” on the detonation wave, i.e. points of convergence of detonation waves from the neighbor points of initiation. The other feature is the presence of the “bundles” which are exeunt to the detonation products. Nodes are the points with high energy level at detonation front. They may cause hydrodynamic instabilities during the compression of a metal liner. Parietal flows in the cell structure of detonation products may be reason for formation of “bundles”. It should be noted that the detonation wave is always convex between the neighbor “nodes”, although in the initial moment the triple-wave Mach configuration is forming and it should lead to aligning of cylindrical wave. The experiments with the use of high explosives with different densities (from 0.95 to 1.65 g/cm3) were carried out on the laboratory installation. The characteristic features of the detonation wave formed by the multipoint initiation can be seen both in solid and in liquid high explosives. Different design features (interlayers made of different materials etc.) did not lead to disappearing of “bundles” and smoothing of “nodes” at the detonation wave.