水下爆炸特性的二维数值模拟研究

2-D Nummerical Simulation of Characteristics of Underwater Explosions

对带有3mm左右厚铝壳或钢壳的柱形TNT、RS 211、T/Γ(35/65)以及ROT901装药在水下采用一端点起爆后,水中冲击波超压分布进行了二维数值模拟研究。对该四种炸药的每一种,分别考虑了药量为1kg、3kg、5kg和8kg四种TNT当量的柱形装药情况。柱形装药的长径比为L/D=1.5左右。计算使用的程序为二维欧拉多流体网格法流体力学计算程序MFIC。给出了水中冲击波超压的空间和时间分布;对铝壳和钢壳两种情况的结果进行了分析、比较;同时给出了缩比模型与1∶1模型之间相应物理量之间的缩比关系。

The characteristics of underwater explosions,especially the distributions and the time histories of shock wave overpressures,which are generated by the underwater explosions of cased cylindrical charges initiated in one-end-point,are numerically simulated by using a two-dimensional multi-fluid hydrodynamic fortran code named MFIC.The cylindrical charges studied here are of four different explosives,including TNT,RS-211,T/Γ(35/65) and ROT901.For each explosive four TNT equivalents,1 kg,3 kg,5 kg,and 8 kg,are considered.Each cylindrical charge has a length to diameter of L/D=1.5 and with a 3 mm thick Fe case or Al case.The spacial distributions of peak overpressure of underwater shock wave and overpressure time histories are obtained.Some overpressure time histories of different points and of different explosives for both Al case and Fe case are presented.The results of Fe case are compared with those of Al case.