MATHEMATICAL-MODEL FOR THE IGNITION OF A MIXTURE OF A LIQUID FUEL ANDSOLID PARTICLES IN AIR

A point mathematical model is developed, which describes the ignition in air of composite mixtures of fine aluminum particles and drops of a hydrocarbon. fuel and a gaseous oxidizer. The generalized overall rea ction of combustion of hydrocarbon vapors, the difference in temperatu re between the components, and the build-up of an oxide film on a meta llic particle are taken into account. In the particular case of a mixt ure containing drops of a hydrocarbon fuel, the model is adapted to th e experimental data on the dependence of the ignition delay on the amb ient temperature. In the case of a composite mist were containing both solid particles and drops, the induction time of ''thermal explosion' ' with oxidizer excess depends to a greater extent on the concentratio n and sizes of fuel drops than on the amount of aluminum particles.