中低Z元素等离子体平均电离度和辐射不透明度的近似计算  

An Approximate Calculation of Mean Ionization States and Radiative Opacities for Medium and Low Z Plasmas

作　　者：姜猛[1] 王尚武[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《湘潭大学自然科学学报》2007年第2期52-56,共5页Natural Science Journal of Xiangtan University

基　　金：国家自然科学基金资助项目;国防科技大学预研基金资助项目(5001181)

摘　　要：在物质处于局域热力学平衡(LTE)的条件下,采用R.M.More提出的改进型平均原子模型和类氢离子的光吸收系数,计算了中低Z元素等离子体的平均电离度及辐射不透明度.将计算结果与SESAME数据库数据和实验数据比较,符合得较好.为便于在辐射磁流体力学计算中的应用,在0.5×106K≤Te≤200×106K的温度范围、10-5(g/cm3)≤ρ≤1(g/cm3)的密度范围对计算结果进行数据拟合,得到了平均电离度和辐射不透明度随温度和密度变化的拟合函数.通过对辐射不透明度采用分温度段拟合,发现拟合值更接近于计算值.Under the condition of LTE approximation and based on the average atom model propesed by R. M. More and the photon absorption eoeffcients of hydrogen - like ions , the mean ionization states and radiative opacities for medium and low Z plasmas have been calculated. By comparing the calculated results with that of SESAME library and the experimental data, good agreements have been found. In order for the mean ionization states and radiative opacities to be conveniently used in the simulation calculation of radiation MHD, the calculated data have been fitted to be the continuous function of temperatures and densities, For mean radiative opacity, the pieeewise ,fitting method was used, which made the fitting data be closer to the calculation data.

关 键 词：平均电离度 等离子体 Planck不透明度 Rosseland不透明度 

分 类 号：O536[理学—等离子体物理]