用多次冲击压缩方法研究稠密氢氦等摩尔混合气体的物态方程  

Investigation of the pressure-volume-temperature equation of state for dense hydrogen-helium mixture using multi-shock compression method

作　　者：田春玲[1] 蔡灵仓[1] 顾云军[1] 经福谦[1] 陈志云[1] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室

出　　处：《物理学报》2007年第7期4180-4186,共7页Acta Physica Sinica

基　　金：国防科技实验室基金(批准号:51478678905ZS7501);西南大学博士基金资助的课题.~~

摘　　要：采用液氮冷却以及气体增压技术,制备了～30MPa及～90K初始状态的氢、氦等摩尔混合气体样品.以二级轻气炮作为加载工具,用不同灵敏度设置的两套多通道瞬态高温计系统获得完整、清晰的稠密氢、氦混合气体多次冲击压缩过程的光谱辐射强度信号.并建立起相应的实验数据处理和分析技术,获得了5—140GPa范围内氢、氦混合气体一至五次冲击雨贡纽物态方程,以及一次、二次和四次冲击温度实验数据.流体变分理论和离解模型用来分析和解释所获得的测量结果.The multi-shock Hugoniot and shock temperatures of gaseous hydrogen-helium equimolar mixture with initial pressure and temperature of - 30MPa and - 90 K have been measured up to 140 GPa using two-stage light gas gun and shock reverberation technique. Two kinds of multi-channel pyrometer systems with different sensitivities, were used in experiment for diagnostics, because the thermal radiation of the sample in the first-shock state is lower than that in the multi-shocked states by a magnitude of one to two orders. The measured pressure, volume and temperature are respectively 5GPa, 12.0 cm^3/mol and 3030 K in the first-shock state, 27 GPa, 6.7 cm^3/mol and 5070 K in the second -shock state, and 105 GPa, 4.0 cm^3/mol and 5090 K in the fourth-shock state. The results for the first- and second-shock states are well described by the fluid perturbation theory and dissociation model. It demonstrates that the dissociation of molecular hydrogen of the compressed sample is negligible in the first- shock state, while about 7% and 32% of molecular hydrogen undergo dissociation in the second- and fourth -shock states, respectively. The fourth-shock temperature measured was lower than the prediction for - 2000 K.

关 键 词：氢 氦混合气体 多次冲击压缩 光谱辐射强度历史 物态方程 

分 类 号：O513[理学—低温物理]