Home – Home – Jornals – Combustion, Explosion and Shock Waves 2016 number 6

The solid-state ignition of a metallized composite propellant (ammonium perchlorate + 14% butyl rubber + 5% aluminum powder + 6% plasticizer) under local heating by several sources of limited power capacity (the dimensions of the hot particle x_p = 4 mm and y_p = 2 mm) was studied by mathematical modeling. For temperature of the heated steel particles and the distance between them varied in the ranges 700 < T_p < 1500 K and 0.1x _p < Δx <1.5x_p, respectively, the values of T_p and Δx were determined for which the ignition delay corresponds to the initiation of combustion of the composite propellant by a single particle, a plate at a constant temperature or several particles. In the region of low initial temperatures of local sources ( T_p < 1100 K), the limiting values Δx - 0.1 x_p and Δx > 1.5x_p were identified for which the characteristics and mechanism of ignition of the propellant by a group of heated particles can be studied using the plate-fuel-gas model and the single particle-fuel-gas model, respectively. Reducing the distance Δx at T_p < 1R 100 leads to a reduction in the induction period to 50% and a decrease in the minimum initial temperature of the source required for propellant combustion initiation from 830 to 700 K. At T _p > 1100 K, the ignition of the metallized composite solid propellant by a single or several particles can be studied using relatively simple one-dimensional models of condensed matter ignition by a plate at constant temperature. The variation in the ignition delay in this case is less than 5%.