预制破片战斗部爆轰产物泄露数值模拟

预制破片战斗部具有破片质量和形状近似100%可控的优点，但其爆轰产物的过早泄露会影响破片的加速过程.为了分析爆轰产物泄露对破片威力的影响，利用数值模拟方法对某预制破片战斗部的爆轰泄露过程进行了研究，并分析了炸药采用不同仿真算法所得结果与试验的吻合情况.结果表明:端面中心起爆时，爆轰泄露主要发生在周向，对破片飞散形态影响较大；流固耦合算法计算得到的破片速度和飞散角与试验吻合最好，最小平均相对误差分别为1.12%和0.56%；综合计算鲁棒性、计算精度、计算时间等，流固耦合算法较适用于爆轰产物泄露的研究. 

Modeling of the Gas Leakage of Premade Fragment Warhead

Premade fragment warhead has the advantage of almost 100 percent control of the fragment mass and shape, but the acceleration velocity of the fragment will be affected by the early leakage of detonation product. In order to analyze the influence of gas leakage on the fragment lethality, numerical modeling was used to study the leakage process of certain premade fragment warhead and computing results from different algorithms were compared with the experiment. The results show that when initiated at one end center, the gas leakage mainly happens circumferentially, having a huge influence on the fragment dispersions. The fragment velocities and ejection angles results of fluid-solid couple algorithm agree best with the experiment results, with the least relative errors of 1.12% and 0.56% respectively. Given the robustness, precision, and time of calculation, the fluid-solid algorithm is a reliable tool for studying the gas leakage of warhead.