装药长径比对半球形聚能装药射流成型的数值模拟

Numerical Simulation on the Jet Formed by Hemispherical Shaped Charge with Length-to-diameter Ratio of Charge

为了得到均匀、不易中断的射流,运用ANSYS/LS-DYNA软件的二维多物质纯ALE算法,建立不同装药长径比有限元模型,数值模拟了6种不同长径比的半球形聚能装药产生射流的过程,对比分析了同一时刻、同一时间段6种装药长径比对射流成型的影响。结果表明,70.5μs时,装药长径比从0.8增至1.8,射流头部速度增大31.9%,射流长度减小23.2%;46.5~70.5μs时段,射流长径比与时间呈类线性增长,射流在装药长径比约为1.2时不易断裂,均匀性最好。

To obtain an uniform and difficultly disrupt jet,a finite element model with different length-to-diameter ratios of charge was established by a two-dimensional multi-material pure ALE algorithm of ANSYS/LS-DYNA software.The process of jet produced by six kinds of hemispherical shaped charge with different length-to-diameter ratios was numerically simulated.The effect of six kinds of length-to-diameter ratio of charge on the jet forming at the same time and the same time period was compared and analyzed.The results show that at 70.5μs,with the increase of the length-to-diameter ratio of charge from 0.8 to 1.8,the head velocity of jet increases by 31.9% and the length of jet decreases by 23.2%.At the46.5-70.5μs period,the length-to-diameter ratio of jet increases similarly linearly with time.The jet is not easy to break and has the best uniformity when the length-to-diameter ratio of charge is about 1.2.