-
摘要: 非透明材料冲击温度测量是通过对界面光辐射历史的观察实现的，因此对界面光辐射历史的研究是非透明材料冲击温度测量的基础。但由于冲击阻抗的失配导致界面上出现波的反射而引起温度的变化与界面热流动产生的温度变化交杂在一起，以及过程的瞬时性，使得对这一过程的实验研究显得非常困难。设计了一种界面波阻抗近似相同的特殊实验装置，用光辐射测量技术研究了在冲击压缩下CHBr3/NaCl界面的热弛豫过程。实验结果和理论分析表明CHBr3/NaCl界面的热弛豫时间在纳秒量级，与Grover等人的理论预估一致。Abstract: Shock temperature measurement of opaque materials is through measuring the optical radiation at sample/window interface. So the research of optical radiation history at sample/window is fundament of shock temperature measurement of opaque materials. But this research is not easily realized because of the mixture of temperature changing at the interface caused by thermal diffusion and wave reflecting because of mismatching of shock impedance between sample and window material. In this paper a special experiment system was proposed for researching the thermal relaxation process. The experimental results at two shock pressure points show that the thermal relaxation time is about nano-second, which agrees with the theoretical result calculated by Grover et al.
-
Key words:
- thermal relaxation /
- shock temperature /
- shock impedance /
- optical radiation technique
-
Urtiew P A, Grover R. Temperature Deposition Caused by Shock Interactions with Material Interfaces [J]. J Appl Phys, 1974, 45(1): 140. Grover R, Urtiew P A. Thermal Relaxation at Interfaces Following Shock Compression [J]. J Appl Phys, 1974, 45(1): 146. McQueen R G, Isaak D G. Characterizing Windows for Shock Wave Radiation Studies [J]. J Geophys Res, 1990, 95(B13): 21735. van Thiel M. UCRL-50108, 1977. Marsh S P. LASL Shock Hugoniot Data [M]. Los Angeles, Berkeley: University of Calif, 1980. 王贵朝, 谢盘海, 谭振南. 髙压下黄铜中追赶稀疏波速度的辐射测量 [J]. 高压物理学报, 1987, 1(2): 144. 经福谦. 实验物态方程导引 [M]. 北京: 科学出版社, 1986: 321-323. -
计量
- 文章访问数: 8025
- HTML全文浏览量: 514
- PDF下载量: 570
下载:
