正柱等离子体在双极扩散及准双极扩散下的磁流体力学性能  

THE MHD CHARACTERISTICS OF POSITIVE COLUMN PLASMA UNDER THE AMBIPOLAR AND QUASIAMBIPOLAR DIFFUSIONS

作　　者：唐福林[1] 卓克聪 

机构地区：[1]中国科学院力学研究所

出　　处：《力学学报》1989年第4期412-418,共7页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金

摘　　要：本文在离子和电子的质量、动量守恒方程的基础上,应用数值方法,求解了交叉电磁场中正柱等离子体的离子和电子的速度、密度和电位沿半径的分布,并对双极扩散和准双极扩散(等离子体中径向电流密度不为零)两种情况下的磁流体力学性能进行了比较,数值计算是对氩等离子体进行的。计算结果表明,提高外加磁感应强度能使准双极扩散条件下的平均离子密度提高,鞘层间距离缩短,阴极鞘层边界离子与电子的径向速度比值上升,而阳极鞘层边界离子与电子的径向速度比值则下降,其中离子密度的变化与实验定性相符,在双极扩散时,磁感应强度增减的影响甚微。An analysis of positive column plasma in which the magnetic and electric fields are crossed is presented on the base of complete conservation of mass and momentum equations for the ions and electrons. In this case, both ambipolar and quasi-ambipolar diffusions are considered. The radial distributions of potential, velocities and number density of ions and electrons are obtained numerically. The results of the computations indicate that when the magnetic field strength gets higher under the quasi-ambipolar diffusion the average number density of ions is higher, the spacing between the anode and cathods sheaths shorter, the ion-so-electron current density higher at the electrod sheath, but lower at the anode sheath.

关 键 词：等离子体 双极扩散 磁流体力学 

分 类 号：O53[理学—等离子体物理]