炸药水中爆炸能量输出结构的数值模拟

Numerical Simulation of Energy Output Structure for the Underwater Explosion

介绍了理想炸药和含铝炸药水中爆炸的能量输出模型,并采用AUTODYN软件,对TNT和PBXW-115水中爆炸远场的冲击波形进行了求解。计算出了冲击波峰值压力、衰减时间常数、冲量、能流密度和冲击波能等参数,并将计算结果与实验数据进行了对比。在不可压缩流体理论的假设下,推导出了水中爆炸一维气泡脉动方程。把脉动方程同爆轰产物的状态方程相结合,计算出1 kg TNT和PBXW-115水中爆炸气泡脉动周期分别为0.213 s和0.283 s,二者的气泡能分别为1.88 MJ.kg-1和4.41 MJ.kg-1,与实验结果吻合较好。

Energy output models for the ideal explosives and aluminized explosives were introduced. These models were used to calculate far-field UNDEX of TNT and PBXW-115 with AUTODYN software. Performance parameters such as peak pressure,time constant,impulse, energy flux density and shock wave energy were calculated. These parameters were compared with experimental data. The dynamic model of high pressure gas bubble in uncompressible liquid was achieved. The dynamic equations and JWL EOS （ Equations of State） of the detonation products were both used to calculate bubble parameters. Bubble periods of 1 kg TNT and PBXW-115 are 0.213 s and 0. 283 s. Bubble energy are 1.88 MJ · kg^-1 and 4.41 MJ · kg^-1 ,respectively. Bubble parameters calculated are consistent with experimental data.