含铝炸药深水爆炸冲击波和气泡脉动的数值模拟

为了研究CL-20基和HMX基及其含铝炸药深水爆炸过程,选取LX-14、LX-19、PAX-30和PAX-29 4种炸药,采用AUTODYN数值计算软件,计算其深水爆炸过程的各项参数。计算结果表明:CL-20基炸药水下爆炸性能优于HMX基炸药;铝粉的加入可以大幅度提高冲击波峰值压力、气泡脉动周期及气泡最大半径,而二次压力波峰值压力略有降低。计算TNT深水爆炸过程的参数,并与试验值相对比,误差小于5%,说明球对称一维方法可以很好地模拟炸药深水爆炸过程。最后,计算得到4种炸药的峰值压力均符合水下爆炸相似律,拟合得到4种炸药峰值压力相似常数。

Numerical Simulation of Shock Wave and Bubble Pulse in Deep Water Explosion of Aluminized Explosive

To investigate the deep water explosion of CL-20-based aluminized explosive and HMX-based aluminized explosive, four typical kinds of explosives ( LX-14, LX-19, PAX-30 and PAX-29 ) were selected for simulation of the explosion parameters using AUTODYN.The results show that the deep water explosion performance of CL-20-based explo-sives is better than that of HMX-based explosives.The peak pressure of shock wave, bubble pulsation period and maximum radius of the bubble can be greatly improved by addition of aluminum powder, while the peak pressure of the first bubble pulse decreases slightly.Variables of TNT in deep water explosion were calculated and compared with the experimental results.The error is less than 5%, which suggests that the one-dimensional method of spherical symmetry can be applied to assess the process of deep water explosion for explosives.Finally, the peak pressure of four kinds of explosives were derived according to the similarity law of underwater explosion, and the peak pressure similarity constants of the four kinds of explo-sives are fitted.