基于水下爆炸理论,采用耦合欧拉-拉格朗日(CEL)方法,建立了CL-20基含铝炸药水下爆炸模型,分析了冲击波载荷和气泡动力学特性; 在此基础上探究了双发CL-20基含铝装药水下爆炸冲击波时空分布规律及气泡融合特性,讨论了不完整刚性边界附近双发CL-20基含铝装药水下爆炸气泡动力学特性,得到了装药种类、破口尺寸和爆距3种关键因素对双发装药水下爆炸气泡载荷特性的影响。结果表明,与TNT装药相比,CL-20基含铝装药水下爆炸气泡半径和脉动周期更大,气泡最大半径增大了27%,脉动周期提高了65%,但气泡脉动压力小于TNT。双发CL-20基含铝装药在水平和垂直位置具有特征尖锐波峰-波谷载荷曲线和特征双峰曲线,冲击波峰值压力大于单发装药,最大增长率可达48.26%。不完整刚性边界破口尺寸、爆距增大会增加双发装药气泡射流宽度和持续时间,CL-20会加剧不完整边界对气泡动力学的影响。
Abstract
To investigate the bubble pulsation and water jet characteristics under the gas-liquid-solid multiphase coupling effect of underwater explosions near the seabed, the Euler method was employed to establish a numerical model of underwater explosions near the seabed under different substrate/water depth conditions. The full physical process of underwater explosions near the seabed under muddy substrate conditions was simulated and compared with experimental results, which showed good agreement, verifying the effectiveness of the algorithm in solving the problem of underwater explosion bubbles near the seabed. Based on this, the influence of seabed substrate and water depth on the bubble morphology, radius, period, and water jet of underwater explosions near the seabed was discussed. The results show that under the premise that the bubbles can be split, the harder the substrate, the faster the bubbles split, and the deeper the water depth, the slower the bubbles split. The harder the substrate and the deeper the water depth, the smaller the maximum radius and period of the bubble, the larger the proportion of the bubble in the total bubble volume at the moment of splitting, and the smaller the peak velocity of the two water jets generated by splitting. During the evolution of the downward water jet, a reverse water jet will form. The harder the substrate, the greater the peak velocity of the reverse water jet. In all calculated cases, the depth parameter(Href)is in the range of 250—750, and the peak value of the reverse water jet velocity is positively correlated with the Href, and the Href is in the range of 750—1000, which is negatively correlated.
关键词
爆炸力学 /
CL-20基含铝炸药 /
水下爆炸 /
冲击波 /
气泡动力学 /
不完整边界 /
耦合欧拉-拉格朗日(CEL)方法
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Key words
mechanics explosion /
CL-20-based aluminized explosive /
underwater explosive /
shock wave /
bubble dynamics /
incomplete boundary /
coupled Eulerian-Lagrangian(CEL)method
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