Combustion and detonation in multi-phase media. Initiation of detonation in dispersed-film systems behind a shock wave (Q1119106)

Consideration is given to the problems of combustion and detonation propagation in heterogeneous media containing an oxidant in the gaseous phase and a fuel in the condensed phase in the form of dispersed particles in the oxidant flow or of a thin film on the channel walls. Detonation in such systems is shown to have a complex unsteady-state structure substantially differing from one-dimensional: the forward detonation front can exhibit mobile discontinuities and can pulsate periodically. A physical model of pulsating and spin detonation in heterogeneous media is developed. A closed system of equations with boundary conditions is composed that makes it possible to mathematically simulate the transition of slow combustion to detonation. The transition process and the detonation determining parameters are calculated numerically. Unsteady-state processes of combustion transition to detonation in dispersed mixtures of air with a hydrocarbon fuel are studied experimentally.