Ignition of a composite propellant by a hot particle under conditions of a nonideal thermal contact

A mathematical modeling of the solid-phase ignition of a condensed material by a single diskshaped hot metal particle under conditions of a nonideal thermal contact between the particle and the propellant due to the natural surface roughness of the latter is performed. The ranges of values of the initial temperature of the local energy source and of the parameter characterizing the propellant surface roughness at which radiative heat transfer across the gas gap between the propellant and particle significantly (up to 25%) influences the ignition delay time, the main integrated characteristic of the process, are determined from numerical simulations.