液态CO2高温高密度状态方程研究

Equation of State of Liquid CO2 at High Temperature and High Densities

1.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Chengdu 610003, China;
2.
Institute of Applied Physics, Sichuan Union University, Chengdu 610065, China

摘要: 利用二级轻气炮作冲击加载手段，采用自己建立的低温靶，比较系统地研究了液态CO2的冲击压缩行为。在20～60 GPa压力区获得六个新的Hugoniot数据点。根据这些实验点，采用液体统计力学理论和化学平衡方法，重新优化获得一组CO2－CO2，CO2－O，CO－O作用势参数。分析表明，引起体系在25 GPa以上区域冲击软化现象的主要机制是CO2离解反应，CO2CO+O。
- 液态CO2 /
- 状态方程 /
- 冲击相变
Abstract: In this work the shock compression behavior of liquid CO2 is investigated using the two-stage light-gas gun and the cryogenic target established by ourselves. Six new Hugoniot data ranging from 20～60 GPa are obtained. On the basis of these data points, the parameters in the effective potentials of　CO2-CO2 and CO2-O are re-determined according to a statistical mechanics theory including chemical equilibrium. The significant mechanism which causes the p-V softening phenomena above 25 GPa is theoretically confirmed to be CO2CO+O.
- liquid CO2 /
- equation of state /
- shock induced phase transition