柱形装药水下爆炸近场冲击波数值仿真

Near Field Shock Wave Numerical Simulation of Cylindrical Charge Underwater Explosion

柱形装药作为水下爆炸的常用装药结构,目前其研究多集中于水下爆炸远场,近场冲击波研究较少。为了得到柱形装药水下爆炸前向近场冲击波威力相关参数,文中建立了以柱形装药前端圆柱面垂直方向距离为x,水平方向距离为y的近场冲击波威力场。首先利用AUTODYN仿真软件对等装药量TNT球型装药和长径比范围为1.1~2的柱形装药水下爆炸过程进行了仿真,分析了柱形装药水下爆炸近场冲击波衰减规律。通过结合Cole经验公式,优化柱形装药仿真值,采用Logistic函数拟合得到柱形装药前向近场冲击波压力峰值经验公式,计算得到压力峰值平均误差约为5%,验证了该经验公式的准确性。研究结果可为柱形装药水下爆炸近场威力参数计算提供参考。

Cylindrical charge,which is a common charge structure for an underwater explosion,is mainly used in far-field underwater explosions.However,there is little research on the near-field shock wave.In order to obtain the parameters related to the forward near-field shock wave power of conventional cylindrical charge underwater explosion,the near-field shock wave power field with the vertical distance of the front-end cylindrical charge x and horizontal distance y is established.In this paper,the underwater explosion process of TNT spherical charge based on equal charge and cylindrical charge,whose ratio of length to diameter ranges from 1.1~2,is simulated using the AUTODYN simulation software.The near-field shock wave attenuation law of cylindrical charge underwater explosion is analyzed.By combining the Cole empirical formula,the simulation value of the cylindrical charge is optimized,and an empirical formula for the forward near-field shock wave pressure peak of cylindrical charge is obtained through logistic regression.The average error of pressure peak is approximately 5%,validating the accuracy of this formula.The research results can be used for the calculation of the near field power assuming a cylindrical charge underwater explosion.