波阻抗梯度飞片超高速发射的数值模拟

Numerical Simulation for Hypervelocity Launching with Graded Impedance Flier-Plates

研究波阻抗梯度飞片的超高速发射特性.应用LS-DYNA有限元程序对波阻抗梯度飞片超高速发射二级飞片的过程进行了数值模拟,计算了二级飞片的压力剖面和速度曲线.研究结果表明,当梯度飞片被聚碳酸酯(Lex-an)封装时,二级飞片的最终发射速度可以达到波阻抗梯度飞片初始加载速度的1.63倍,并且所设计的波阻抗梯度飞片能够实现对二级飞片的准等熵加载.

Studies the hypervelocity launch feature of graded-impedance flier-plates. Using LS- DYNA, the hypervelocity launch process with graded-impedance flier-plate impacting the secondary flier-plates is numerically simulated, the pressure profiles and velocity profiles of the secondary flier-plates are calculated. The results show that the secondary flier-plate impacted by graded-impedance flier-plate encapsulated with Lexan can be accelerated to a final launching velocity which is 1.63 times larger than the initial impact velocity,and the graded-impedance flier- plate used can generate a quasi-isentropic loading process while it impacts on the secondary flierplates.