Abstract
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 (dimensions of the hot particle x p = 4 mm and y p = 2 mm) was studied by mathematical modeling. For the 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 < 1.5xp, 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, by a plate at a constant temperature or by several particles. In the region of low initial temperatures of the local sources (T p < 1100 K), the limiting values Δx → 0.1x 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–propellant–gas” model and the “single particle–propellant–gas” model, respectively. Decreasing the distance Δx at T p < 1100 K decreases the induction period to 50% and reduces the minimum initial temperature of the source required to initiate propellant combustion 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 material ignition by a plate at constant temperature. The variation in the ignition delay in this case is less than 5%.
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Published in Fizika Goreniya i Vzryva, Vol. 52, No. 6, pp. 83–93, November–December, 2016.
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Glushkov, D.O., Kuznetsov, G.V. & Strizhak, P.A. Ignition of a metallized composite solid propellant by a group of hot particles. Combust Explos Shock Waves 52, 694–702 (2016). https://doi.org/10.1134/S0010508216060095
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DOI: https://doi.org/10.1134/S0010508216060095