Limiting conditions of stable propagation of detonation with a one-dimensional zone in liquid explosives

Summary

The critical diameter of condensed explosives with a one-dimensional zone is notdirectly connected with its width. It is considerably greater and is determined by the conditions of ignition and recovery of the detonation front after collapse of the ignition lag in the detonation wave zone by the lateral rarefaction wave.

Since collapse in the zone transfers the heat release kinetics from degenerate to normal conditions, when an induction period, strongly dependent on temperature, appears, one would expect to find in these explosives a steep dependence of critical diameter on initial temperature, which is indeed observed in NG [9].

It should be noted that the comparison in [9] between impact sensitivity and critical diameter is unfounded, since the critical diameter is determined by the effective activation energy and the degree of shock heating behing the collapse line, which, in turn, depends on the power of the explosive. In shock initiation the heating of the explosive is given by the parameters of the active charge, so that the power of the explosive itself does not take part directly. Thus, the impact sensitivity is determined only by the effective value of the activation energy.