Combustion model for a mixed solid fuel with evaporating coolant

This paper presents a combustion model for a solid fuel consisting of a matrix capable of self-sustained combustion and particles of a polydisperse coolant distributed in it. Heat transfer between the exothermically decomposing matrix and coolant particles in the condensed phase and the gas phase products of their gasification. The leading reaction in the region of the matrix and the evaporation surface of the coolant are assumed to be located on the interface. The heat consumption for the evaporation of the coolant is determined by the depth of its gasification during passage through the interface, which depends on the dispersion of the coolant and the burning rate of the fuel. Parametric identification of the model was carried out using data of sieve analysis of the granulometric composition of the coolant and an experimental dependence of the burning rate on pressure. It is shown that the model can be used to predict and providing the required ballistic characteristics of the fuel at the stages of its testing and series production.