Simulation Analysis on the Ignition Mechanism of Box Propellant Under Temperature Variation Condition

Box propellant is subject to undergo a long storage time before charging, during which accidents can cause huge casualties and economic losses. In order to reveal the ignition mechanism of box propellant, it is necessary to simulate realistically the hot spot formation process of propellant grains under different environments. The key to solving this problem is to establish a mathematical model that can couple the dynamic temperature distribution of actual storage environment and the thermal decomposition reaction of nitrate. This paper attempts to obtain the dynamic relationship between the exothermic rate of propellant and temperature based on nitrate reaction kinetics, to construct the energy source term describing the self-decomposition heat generation of propellant, and then truly reproduce the ignition process of box propellant under different environments based on a finite volume model of propellant—box. Overall, this method makes it feasible to simulate the self-ignition process of propellant under dynamic storage conditions, providing a theoretical basis for revealing the self-ignition mechanism of box propellant.