液氮冲击压缩特性的理论计算

THEORETICAL CALCULATION FOR SHOCK COMPRESSIONAL PROPERTIES OF LIQUID NITROGEN

用修正的WCA理论计算了液氮冲击压缩至 70GPa的一次冲击Hugoniot数据。计算中引入与体系比容有关的分子离解因子 ,计算结果表明 ,在 33GPa以上液氮体系发生的相变为分子离解相变 ,该过程对体系热力学状态有较大影响 ,分子离解是对冲击能量的吸收过程 ,导致体系冲击压力和温度增长率下降。

For the liquid nitrogen, the modified WCA fluid perturbation theory is used to calculate the shock pressure and shock temperature with the exp 6 reference potential. The theory is generalized from multi component system by adding the molecular dissociation fraction, which is related to volume . The theoretical results of p H and T H are in good agreement with those of experimental data up to 70 GPa. According to the theoretical and experimental data, the shock energy is partially absorbed by molecular dissociation.