柱形装药水下爆炸远场冲击波压力峰值分布

摘要

为定量研究柱形装药水下爆炸压力场，进行了数值模拟。采用无限水域下的二维计算方法与RDX柱形装药，仿真得到在药包径向，轴向之间相隔22．5°的5个方向上不同位置的冲击波压力峰值，据此定性分析了作用方位和长径比对远场压力峰值分布的影响。为避免对柱形装药冲击波直接量化分析，假设其压力峰值分布对于等量球形装药存在映射关系，进而得到映射系数，再结合球形装药经验公式得到了压力峰值近似分布式，并用TNT水下起爆数值模拟初步验证了假设和分布式。%Based on the dynamic analysis software AUTODYN,numerical simulation was performed for underwater explosion of cylindrical charges.Using the 2D calculation method under infinite water and RDX cylindrical charges,shock wave pressure peaks of different positions in 5 directions along half-lines with interval of 22.5°between axial direction and radial one of a cylindrical charge were obtained,and the effects of action direction and aspect ratio on far-field pressure peak distribution were qualitatively analyzed.Then,to avoid direct quantitatively analyzing shock wave of a cylindrical charges,the assuming that there exists mapping relation between peak pressure distribution of a cylindrical charge explosion and that of spherical one with same dose was made.Then,the mapping coefficient was obtained,and the formulas of far-field shock wave pressure peak distribution for cylindrical charges was developed using the empirical formulas for spherical charges.Finally,the numerical simulation for underwater explosion of TNT charge was conducted, and the proposed assuming and the distribution formulas were preliminarily verified.