基于烤燃实验和数值模拟的战斗部装药热安全性

In order to study the thermal safety of the warhead charge, a method is proposed for calculating and analyzing the thermal safety of warhead charge and determining the parameters of the reaction modelbased on the temperature of explosive cook-off, the speed of driving piston and the reaction pressureof cook-off. Taking RDX / Al / Binder explosives as an example, the thermal reaction temperature of charge before ignition and the moving speed of piston and the combustion pressure after ignition are measured using the cook-off experiments designed of multi-point temperature measurement and the speed and combustion pressure of driving piston measurement. The thermal decomposition reaction kinetics and combustion reaction model parameters of explosives are calibrated for the quantitative description of the reaction severity through numerical simulation calculation. The cracking of warhead shell is calculated by using the grid node separation calculation method, and the whole cook-off process of warhead charge is numerically simulated. The results show that, for the warhead RDX / Al / Binder explosive charge, the slower the heating rate is, the longer the charge ignition time is, the closer the ignition area is to the center of charge, the more serious the shell rupture is, the greater the kinetic energy of shell is, the greater the kinetic energy of charge is, and the stronger the charge reaction is.