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Jet formation and penetration mechanism of W typed shaped charge

ISSN号：0567-7718
期刊名称：Acta Mechanica Sinica
时间：0
页码：107-120
语言：英文
分类：O35[理学—流体力学;理学—力学]
作者机构：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology, 100081 Beijing, China
相关基金：The project supported by the National Natural Science Foundation of China （10625208）.
相关项目：陶瓷材料的动态力学特性和抗侵彻机理研究

作者： Wang, Cheng|Ning, Jianguo|Huang, Fenglei|

关键词： WSC, 不稳定性, 环膜液体射流, 流体力学, WSC , Annular jet , Interface tracking Numerical simulation

中文摘要：

存在古典塑造的费用为他们能够在金属性的目标完成大洞深度到洞直径比率的更长的喷气是众所周知的。处于一些状况，在那里然而产生为洞深度获得 1:1 比率到在塑造的正常以外的洞直径的需求收费能力。形状充电的新变体，命名 W 打了形状充电(WSC ) ，在这被建议纸，它能遇见 1:1 比率的需求，并且基于能在合适的开始计划之上生产环形的喷气的几何学。在这篇论文，我们现在的形成和穿入基于三个不同计划 WSC 结果。我们也证明并非所有 WSC 图案能形成环形的喷气，仅仅环状地开始的 WSC，它也完成“内部外部的班机相等推动”标准，有能力形成环形的喷气。试验性、数字的结果证明当在环形的开始戒指直径和费用直径之间的比率是 0.75 时，一口环形的喷气被形成，它被在真空执行的高速度相片也支持。2D 数字模拟与该土地所固有被执行在有追踪算法的多材料接口的 Eulerian 途径被利用的地方，发达模拟软件在喷气形成过程期间包含了发现各种各样的机制。计算结果在对试验性的结果的好同意被发现，显示接口处理算法在这建议纸不能仅仅处理大变丑问题，而且清楚地描绘材料接口的变化。它对从班机倒塌的过程的模拟特别合适到塑造的费用喷气的形成。

英文摘要：

Existing classical shaped charges are well known for their longer jets capable of achieving large hole depth to hole diameter ratios in metallic targets. However, in some situations, there arises demand to obtain 1：1 ratio for hole depth to hole diameter which is beyond normal shaped charges capability. A new variant of shape charge, named W typed shape charge （WSC）, is proposed in this paper, which can meet the demand of 1：1 ratio, and is based on the geometry that can produce annular jets upon proper initiation scheme. In this paper, we present formation and penetration results of WSC based on three different schemes. We also show that not all WSC designs can form annular jets, only annularly initiated WSC, which also fulfils the ＂Internal-External Liners Equal-Impulse＂ criterion, has the capability to form annular jet. The experimental and numerical results show that when the ratio between annular initiation ring diameter and the charge diameter is 0.75, an annular jet is formed, which was also supported by high speed photographs performed in vacuum. 2D numerical simulations are performed with indigenously developed simulation software, where Eulerian approach with multi-material interface tracking algorithm is utilized, to find various mechanisms involved during jet formation process. The calculation results are found in good agreement with the experimental results, indicating that the interface treatment algorithm proposed in this paper can not only deal with large deformation problem, but also depict clearly the variation of materials interface. It is especially suitable for simulation of the process from liner collapse to formation of shaped charge jet.

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