起爆方式对线性聚能装药射流形成的影响

以工程中常用的柔性切割器为研究对象，在不考虑端部效应的前提下，对3种起爆方式下线性聚能装药射流的形成过程进行了理论分析和数值模拟。结果表明，不同起爆方式下射流头部速度以端部面起爆最大，线起爆次之，端部点起爆在端面附近处形成的最低，但在距端面一定距离处，射流头部速度又能增大到与端部面起爆的速度相近。在射流内部，端部面起爆形成的射流在内部各点处的速度都是3种起爆方式中最大的，而端部点起爆时，则是随着距起爆点距离的增加由处处小于线起爆的射流速度分布转变到与端部面起爆相同的射流速度分布。在此基础上进一步提出3种起爆方式下线性聚能装药切割目标的数值模拟方法。

Effect of Initiation Ways on Jet Formation of Linear Shaped Charge

The flexible blasting cutter applied widely in blasting engineering is chosen as the object of this research.No considering the effect of the free end of linear shaped charge,a theoretic analysis and a numerical simulation analysis for the jet formation process of linear shaped charge with three different ways of initiation are performed.The results that:(1) The magnitude of velocity of jet head with area initiations at end is the largest, that with line initiations takes second place,the smallest is the speed of jet head formed at vicinity of end with end point-initiation,but it can reach the magnitude of that with end area initiations at some distance from the end.(2) The velocity at any position from jet head to jet rear of linear shaped charge with end area-initiation is largest among three ways of initiation,and that with point initiation at end is initially smaller than that with line initiations at everywhere from the head to rear of jet,but with distance from the end of linear shaped charge increasing,those velocities at every positions from head to rear of jet with point initiation at end can increase to the same magnitudes as with end area-initiation.On the base of obtained results,three numerical simulation methods for the cutting process of linear shaped charge with three different ways of initiation are presented.