含铝炸药近场水下爆炸冲击波的实验及数值模拟

Experiment and numerical simulation study on the near-field underwater explosion of aluminized explosive

含铝炸药能改善能量的输出结构,增强爆轰产物的做功能力,将其应用于水下爆炸,能显著提高水中兵器的爆炸威力和毁伤能力。基于电测法采用PVDF压力传感器开展含铝炸药RL-F和TNT近场水下爆炸冲击波实验,并采用耦合欧拉-拉格朗日(CEL)法对其进行模拟;通过将仿真结果与实验值及经验值对比,结果表明采用合理的边界条件、计算参数和有限元模型,CEL方法能准确地模拟含铝炸药和TNT近场水下爆炸冲击波的传播过程;含铝炸药近场水下爆炸冲击波压力衰减速率相对于TNT较缓慢。在验证数值模型合理性的基础上,将数值结果拟合得到TNT近场水下爆炸冲击波峰值压力在6倍装药半径内以及含铝炸药峰值压力在一定比例距离范围内的近似回归公式。

The application of aluminized explosive to underwater explosion can enhance the brisance and damage capability of underwater weapons significantly. The near-field underwater explosion experiments of aluminized explosive RL-F and TNT were carried out using PVDF pressure sensors based on the electrical measurement method. Meantime, the coupled Eulerian-Lagrangian(CEL) method was used for numerieal simulation. The numerical results agree well with the experimental and empirical ones. The results show that the CEL method can be used to simulate the propagation process of near-field underwater explosion shock wave of TNT and aluminized explosive accurately if reasonable boundary conditions, calculation parameters and finite element model are adopted. The near-field underwater shock wave pressure attenuation of aluminized explosive is slower than that of TNT. The approximate regression formulas for the peak pressure of near-field underwater explosion shock wave of TNT within 6 times of charge radius as well as of aluminized explosive in a certain distance range were obtained by fitting the simulation results.