激光驱动的1维准等熵压缩数值计算

Numerical simulation for 1-D quasi-isentropic compression irradiated by laser

为了研究激光辐射驱动平面材料的准等熵压缩过程,基于激光间接驱动的1维平面应力装载过程和熵增的数学模型,用拉格朗日法计算了平面材料在1维压缩情况下不同位置的压缩比、应力和熵增随时间的变化过程,并用已有的实验数据进行计算,数值计算结果与文献报道的结果符合得很好。结果表明,粒子速度、材料比热容、Hugoniot参量和Grüneisen系数是表征1维准等熵压缩的基本参量;综合运用这些参量可以判断等熵压缩过程。

For the sake of studying isentropic compression of plane material irradiated by laser, based on the model of 1-D stress loading and entropy increase. The evolution of compression ratio, stress and entropy increase of plane material＇s Lagrangian points were computed with Lagrangian method and the existing experimental data. The simulation results are consistent with reported experimental results and show the basic characterization parameters, such as particle velocity, material specific heat, Hugoniot parameters and Gruneisen coefficient. Quasic-isentropic compression can be judged with these parameters.