Combustion of the metallized composite solid chunk fuel charge with a flat channel in a mass force field

In this paper, combustion of a channel charge of a metallized composite solid chunk fuel in the field of mass forces is modeled. We have investigated the influence of the $g$-force on the total mass influx from the combustion surface of two parallel plates of the metallized solid fuel. The combustion rate of the fuel is calculated based on the nonstationary model of the metallized solid fuel combustion. The conducted computational and theoretical analysis has provided the data on the influence of the mass forces and the composition of the fuel on the total mass influx from the combustion surface. The $g$-force values are ranged from $-650$ to $650$ m/s$^{2}$. It is assumed that the $g$-force is directed along the normal to the combustion surface; otherwise, the projection of the $g$-force onto the normal to the combustion surface is considered. The obtained results have shown that the effect of the $g$-force is not symmetric — the $g$-forces, which are identical in magnitude but different in sign, lead to a different response of the combustion rate. The character of the dependence between the combustion rate and $g$-force for the particles with the radius greater than $7.5$ $\mu$m is nonmonotonic. The obtained results demonstrate the importance of taking into account the effect of the $g$-force on the combustion rate when simulating nonstationary processes in solid propellant engines at the stages of start, maneuvering, and deceleration.