旋转运动对聚能射流形成的影响数值模拟

Numerical Simulation of Rotational Velocity on Shaped-charge Jet Formation

利用LS-DYNA3D有限元软件,通过数值模拟研究了旋转速度以及偏心起爆与旋转运动的耦合对聚能射流形成的影响。数值模拟结果显示,对于口径为36mm的聚能装药,当旋转速度为4000r/min时,影响不显著,当转速为16000r/min时射流头部速度降低了4.2%。随着装药旋转速度的增加,头部速度下呈非线性降低,射流和杵体直径变细,射流长度变短。旋转和偏心起爆的耦合对射流的形成造成严重影响,当旋转速度16000r/min,偏心起爆距离为1mm时,射流头部速度会进一步降低,直径变粗,随着射流的延伸,射流中后部逐渐分成两股射流。模拟结果与已有试验现象相符。

Classical experimental results show that the shaped charge jet loses its penetration capability drastically under high values of an- gular velocity. Rotating shaped charge jet formation was simulated with finite-element code LS-DYNA3D, and compared with that of rota- ting shaped charge coupled with off-center initiation. The results show that it has no obvious effect on the jet head velocity under 4000r/ min, when the angular velocity is 16000r/min, the jet head velocity decreases by 4.2%. The jet and slug diameter become thinner and the jet length become shorter with the angular velocity increase. Angular couple with eccentric initiation has serious effect on the jet formation, the shaped charge jet head has lower velocity under the condition that 16000r/min and eccentric distance l mm, while the jet diameter be- comes larger than that of the only rotating shaped charge, and with the jet stretching, it will bifurcate into two thinner jets at the middle and back of the formed jet.