一种计算氩等离子物态方程的简单模型

A simplified model for computing state equation of argon plasma

将Thomas-Feimi统计模型电离势的数值结果进行函数逼近,给出一个便于近似数值求解的解析表达式和计算电离度的近似计算方法,计算了Ar元素LTE情况下的电离度和物态方程,结果与Saha模型的计算结果和实验结果符合较好.所提出的简单模型也适用于计算混合物物态方程,可以在电磁发射技术领域中的强电离等离子体中有广阔的应用前景.

In this paper, We first fitted the numerical results of the ionization potential calculated by Thomas - Fermi statistical model and gained the analytical function of the potential versus the degree of ionization, then calculated the ionization potential and the average degree of ionization for argon versus temperature and density in local thermal equilibrium （LTE） case. The curve of pressure versus specific volume V of argon plasmas is calculated according this simplified model. The calculated results by this simplified model are in agreement with experimental data and the calculated results of the Saha - equation theory. This simplified model can be used to the calculation of the equation of state of plasmas mixture and is expected to be widely used in the field of EML technology involving the strongly ionized plasmas.