Numerical study of marginal modes of heterogeneous detonation in non-uniform mixtures

Methods of mathematical and numerical modeling of two-dimensional flows are used to study the modes of heterogeneous detonation in gas suspensions of aluminum particles with non-uniform distribution of the particle concentration over the width of the flat channel. In the model of the reduced kinetics of detonation combustion of aluminum particles in oxygen and air, the dependence of the integral heat release on the particle loading is determined in accordance with the known data on the detonation velocity. Concentration limits of detonation for homogeneous mixtures are determined. Two-layer systems and systems with a transverse concentration gradient are considered when the mixture in a layer or in a part of a region is outside the concentration limits. The flow patterns are presented and the scenarios of propagation and detonation breakdown are described.