不同流速对LTE态下氢等离子体特性的研究

Influence of Flow Velocity on Characteristics of Hydrogen Plasma in Local Thermal Equilibrium

采用二维流体力学模型研究了多级直流弧放电装置中流速对处于局部热平衡状态下氢等离子体特性的影响。分析了氢等离子体中心轴线处电场和压强的分布情况;各粒子密度在通道中的分布状态;通道出口处等离子体温度以及电导率的分布情况。模拟结果表明,随着流速的增大,中心轴线处电场和压强均增大;通道中氢等离子体的各粒子密度变化很小;通道出口处等离子体温度以及电导率在出口处沿径向的分布影响不大。

The hydrogen plasma in local thermal equilibrium,generated by cascaded arc discharge,was modeled and simulated with the software package PLASIMO,developed by Einhoven University.With the 2-D fluid model,the influence of hydrogen velocity on the plasma characteristics was evaluated,including the axial distributions of electric field and pressure,the radial density distributions of the different particles（H2,H＋2 H＋,and H） of the plasma in the passageway,and the distributions of plasma temperature and its electric conductivity at the exit of the passageway.The simulated results show that the velocity strongly affects the axial distributions of electric field and pressure;but rather weakly on other characteristics.As the velocity increases,the axial distributions of the field and pressure increased.