Numerical simulation of the heterogeneous detonation propagation in a channel with expansion at different mixture composition.

The processes of detonation propagation in channels with linear expansion filled with aluminum - oxygen suspensions of different concentrations are analyzed on the base of numerical simulation of two-dimensional flows. The aim of the work is to determine the effect of the ratio of oxidizer to fuel on the critical conditions of detonation propagation. A semi-empirical model of aluminum detonation is used, which takes into account the dependence of the energy release of the combustion reaction and the portion of unburnt particles on the mass loading of particles. It was found that pre-stoichiometric mixtures are characterized by higher detonation ability than the stoichiometric and super- stoichiometric mixtures. [ABSTRACT FROM AUTHOR]