双层椭圆形药型罩装药射流成形时长短轴比、铝铜铁三种材料的声阻抗和罩间距三因素正交设计研究

为获得双层椭圆形空心药型罩最佳结构参数，在利用AUTODYN软件对不同方案进行数值模拟分析的基础上，以炸高为2倍口径，射流头部速度和射流断裂前最大长度为考察指标，对影响射流成型的长短轴比、铝铜铁3种材料的声阻抗和罩间距3种结构参数进行设计。结果表明：在这3个因素中，各因素对射流速度影响由主至次的顺序是罩材料声阻抗、长短轴比、罩间距；对射流长度影响由主至次的顺序是长短轴比、罩间距、罩材料声阻抗。外罩材料为声阻抗值较小的铝、长短轴比为1．8、罩间距为2 mm时，双层椭圆形空心药型罩所形成的射流性能最优。

Study on Orthogonal Design of the Axial Ratio,the Acoustic Impedance of Aluminum,Bronze and Iron and the Space Between Covers Forming Double Oval Hollow Linear Jet Stream

In order to obtain the best main structure parameters of the double linear shaped charge with oval cover,the different projects were simulated numerically with AUTODYN-2D program and by using the orthogonal design method,whose inspection index is the maximum length of the pre-broken jet and the head velocity at the burst height which is 2 times of caliber.The effect that influences the structure parameter of axial ratio of jet length,covers distance,material acoustic impedance of jet were optimizedly designed.Studies show that we can know that the primary and secondary relations of jet velocity is material acoustic impedance,axial ratioand distance,and what to jet length is axial ratio,distance and material acoustic impedance.We can obtain that the best jet produced by double linear shaped charge with oval cover to meet the requirement of jet velocity and length,when the material is Aluminum,and the axial ratio is 1 .8,and the distance between double layer liner is 2 mm.