渐变阻抗飞片超高速发射数值模拟  

Numerical Simulation of Hypervelocity Launch of Flier Plate with Gradual Change Impedance

作　　者：陈朗[1] 刘群[1] 鲁建英[1,2] 龚自正[3] 郭欣伟[4] 

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]防化指挥工程学院,北京102205 [3]中国空间技术研究院总装与环境工程部,北京100094 [4]辽宁大学物理系,辽宁沈阳110036

出　　处：《高压物理学报》2009年第3期167-172,共6页Chinese Journal of High Pressure Physics

摘　　要：为在轻气炮上实现二级飞片的超高速发射,设计了波阻抗连续变化的渐变阻抗飞片。变阻抗飞片撞击面为镁,底面为钨,中间为镁、铜和钨的掺合材料。建立了变阻抗飞片超高速发射的计算模型,采用分成单元层描述阻抗变化。对变阻抗飞片超高速发射二级飞片过程进行了数值模拟计算,分析了阻抗分布、二级飞片直径和缓冲层厚度对二级飞片速度的影响。结果表明:在优化阻抗分布、二级飞片直径和缓冲层厚度的条件下,二级飞片的最大速度能够达到16 km/s以上。A graded-density flier plate with gradual change impedance was designed to launch the secondary flier plate in hypervelocity on a light gas gun. The impact surface of graded-density flier plate was made of magnesium, the base surface was made of tungsten, and the middle part was made of the mixture of magnesium, dopper and tungsten. A calculating model of hypervelocity launch was developed. The numerical simulations of hypervelocity launch with graded-density flier plate were conducted. The effects of change law of impedance, diameter of secondary flier plate and thickness of buffer on the secondary flier plate velocity were analyzed. The calculated results indicated that the maximum velocity of the secondary flier plate exceeded 16 km/s in the condition of optimizing the change law of impedance of graded-density flier plate,diameter of secondary flier plate,and thickness of buffer.

关 键 词：轻气炮 超高速发射 变波阻抗飞片 数值模拟 

分 类 号：O521.12[理学—高压高温物理]