Numerical Simulation of Ignition and Combustion of Boron Gas Suspension behind Shock Waves

A physicomathematical model and a computational method have been developed to model the ignition and combustion of a suspension of boron particles in a gaseous oxidizer behind shock waves of different strength. Calculations were carried out for particles of diameter 1-20 mu m with a volume concentrations m(2) = 10(-4) and 10(-5) corresponding to a lightly dusted medium. Oxygen and a mixture of oxygen and water vapor at a mass concentration of water vapor of 10-90% were considered as an oxidizer. Combustion wave structure was examined, and the behavior of the main parameters of the gas and particles was described. The influence of water vapor on the ignition delay and combustion times of boron particles was analyzed. The results were compared with published experimental data, and agreement on the ignition delay time at an ambient gas temperature of 2200-3000 K was obtained.