科研之友
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摘要
Warm dense argon was generated by a shock reverberation technique. The diagnostics of warm dense argon were performed by a multichannel optical pyrometer and a velocity interferometer system. The equations of state in the pressure-density range of 20-150 GPa and 1.9-5.3 g/cm(3) from the first-to fourth-shock compression were presented. The single-shock temperatures in the range of 17.2-23.4 kK were obtained from the spectral radiance. Experimental results indicates that multiple shock-compression ratio (eta(i) =rho(i)/rho(0)) is greatly enhanced from 3.3 to 8.8, where rho(0) is the initial density of argon and rho(i) (i = 1, 2, 3, 4) is the compressed density from first to fourth shock, respectively. For the relative compression ratio (eta(i)' =rho(i)/rho(i-1)), an interesting finding is that a turning point occurs at the second shocked states under the conditions of different experiments, and eta(i)' increases with pressure in lower density regime and reversely decreases with pressure in higher density regime. The evolution of the compression ratio is controlled by the excitation of internal degrees of freedom, which increase the compression, and by the interaction effects between particles that reduce it. A temperature-density plot shows that current multishock compression states of argon have distributed into warm dense regime.
- 出版日期2015-10-30
- 单位北京应用物理与计算数学研究所; 中国工程物理研究院流体物理研究所
