N2负流柱放电过程仿真(英文)

Two-dimensional Simulation of the Negative Streamer in N_2 Between Parallel-plate Electrodes

采用粒子连续性方程耦合泊松方程构建氮气放电流体模型,使用有限元法对该模型求解,获得窄间隙(5 mm)氮气放电过程粒子动力学特性.由仿真结果可知:在均匀电场中,流柱头部粒子密度随放电过程的发展不断增大;流柱头部电子密度及电场强度随初始电子密度的增加而逐渐增大;初始电荷分布直径大小直接影响流柱的发展速度;另外,对于负流柱放电,粒子密度梯度及电场分布随外电场增大而增大.

N2 gas discharge fluid model is built by employing the continuity equation-the Poisson＇s equation and the model is worked out by using finite element method.Thus obtained is the particle dynamics property of the narrow-gap（5 mm） N2 during its discharge process.Through imitating the N2 gas discharge process,the author finds that in a uniform field,the space electric field and electrons density and ions density at the tip of the streamer increase with the propagation of negative streamer;when the ionization density in the initial hemispheroid increase,the space electrons density and electric field at the tip of streamer increase.The propagation velocity and other characteristics of the streamer are influenced by the diameter of the initial charge distribution.For negative streamer,the ionization density and electron density gradient and electric field at the tip increase with increasing applied field.