The paper presents the results of numerical simulations of detonation processes in polydisperse gas particle mixtures. Initiation and propagation of plane detonation waves, two-dimensional detonation flow of cellular detonations are investigated using the model of aluminum particles of two, three, and five fractions suspended in oxygen. Specific features of structures of non-ideal detonation, scenarios and criteria of detonation initiation are revealed. Properties of cellular detonations, specifically degeneration of detonation cells, are obtained. With dominating fraction less than 40% complete transformation of the cellular detonation into a steady propagating planar detonation wave occurs. This is stipulated by the phase interaction processes of different fractions. The results are confirmed by experimental data.
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