有效射流结构模式的数值模拟  

Numerical simulation on structure modules of effective jet

作　　者：侯秀成[1,2] 蒋建伟[1] 陈智刚[2] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]中北大学机电工程学院,山西太原030051

出　　处：《爆炸与冲击》2014年第1期35-40,共6页Explosion and Shock Waves

摘　　要：应用LS-DYNA程序及示踪点信息后处理方法,将典型小锥角药型罩沿母线方向分为4段,研究其微元在炸药爆炸驱动下的运动规律及有效射流结构模式。射流形成并稳定后,将罩质材料按速度大小分为6段,得到各段结构组成模式。结果表明,有效射流高速段由药型罩顶部材料组成,次高速段及中速段由罩中部及中下部材料组成,靠近罩底部约0.25倍罩高范围内的材料不形成射流,有效射流段为初始材料微元的管状分层分布形结构。The typical copper liner with a small cone angle was divided into four sections along the bus direction via the explicit finite software LS-DYNA, and the tracer point method was used to study the movement of the liner element and the structure modules of the effective metallic jet. The result indi- cates that the liner material may be divided into six sections by velocity interval after the jet formation and stabilization. The highest-velocity section is made of the top material inside the liner, and the mid-higher velocity section and the mid-velocity section made of the middle and lower half material in- side the liner, respectively. In the height range of about 0.25 times as high as the liner height away from the liner bottom, the liner material can not become effective jets. And the initial material ele- ments of the liner are distributed as tubular in the effective jet.

关 键 词：爆炸力学 结构模式 示踪点 有效射流 药型罩 LS-DYNA程序 

分 类 号：O385[理学—流体力学] TJ410.33[理学—力学]