On the influence of the fuel concentration in a hybrid gas-suspension on the speed of the combustion front propagation

A physico-mathematical model of combustion of the hybrid gas suspension with allowance for the heat expansion of the gas mixture and the movement of the phases is presented. Distributions of medium parameters in the combustion front are presented. Results of the numerical study of the dependence of the combustion front velocity in the hybrid gas suspension on the concentration of the gas fuel in the mixture, size of the reacting particles, and the mass concentration of the particles. The presence of reacting particles of the dispersed phase decreases the combustion rate at large values of fuel concentration in the gas phase. This occurs due to the fact that heated particles decrease the temperature in the front of the flame. They also take a part of the oxidizer from the gas phase for the reaction. Since the thermal effect from their combustion is lower than that of the reaction in the gas phase, this also leads to a decrease in the combustion rate. With a decrease in the concentration of the fuel, the presence of small-size reacting particles leads to an increase in the combustion rate in comparison with the case of combustion in a gas mixture without particles. It is explained by the increase in the general heat effect of combustion reactions of the gas and dispersible fuel.

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