烤燃条件下 JEO 聚能装药战斗部泄压结构研究

A pressure relief structure of JEO shaped charge warhead during cook-off is studied to improve the thermal safety of JEO shaped charge warhead. A multiphase flow component transport model of explosive cook-off is established, in which the effect of thermal decomposition pressure on the cook-off process is considered. A multi-point temperature and pressure measurement experiment is designed to study the temperature and pressure change characteristics of JEO explosive during the cook-off process and check the relevant parameters of the model. The thermal decomposition process of JEO explosive in the shaped charge structure is numerically simulated to obtain the change laws of temperature and solid volume fraction of the explosive under different heating rates, and determine the ignition position and pressure of the explosive in the structure. In view of the combustion process of JEO explosive after ignition, the pressure relief delay time is introduced, and an explosive pressure growth model considering the pressure relief structure is established. The critical pressure relief area of JEO explosive in this structure is determined. The influence law of different charge ignition positions on the internal pressure change of the explosive is calculated and obtained by taking the ignition position and ignition pressure obtained in the thermal decomposition numerical simulation as initial conditions. According to the critical pressure relief area, ignition position and pressure growth in the explosive, the area of pressure relief hole on side wall and the pressure screw size of the end liner are determined, and a combined pressure relief structure of pressure relief hole and liner push-out suitable for JEO explosive in this structure is designed. Fast and slow cook-off experiments were carried out on JEO shaped charge warhead with the pressure relief structure, and the effectiveness of the pressure relief structure was verified. The research results indicate that as the heating rate decreases, the ignition time of JEO charge shaped charge warhead is prolonged, and the ignition position moves from the surface of the charge to the center of the charge. As the distance between the ignition position and the pressure relief structure increases, the ignition delay time increases, the peak pressure inside the shaped charge warhead increases, and the reaction intensity of the warhead also increases.