一维柱状大气等离子体演化过程模拟

Simulation of evolution of one-dimensional cylindrical atmosphere plasma

用数值模拟的方法,对等离子体发生器脉冲结束后,一维柱状等离子体化学反应扩散过程的时空演化规律进行了研究。对比了不同发生器半径下,电子的衰减过程,并推出了相应的等效电子寿命。发现在地面附近,发生器半径对于电子寿命的影响很小。并对不同位置的总的负离子反应扩散过程进行了研究,印证了在10^(-6)s以后,等离子体为典型的负电等离子体。给出了几种主要的负离子的反应扩散曲线,分析了负电荷的转移过程。其结果对于负离子发生器,介质阻挡放电的理论研究和实际应用都有重要意义。

The chemical process of atmospheric plasma has been numerically studied by using one- dimensional cylindrical model. The spatio- temporal evolution of the plasma after a single pulsed discharge is simulated. The temporal evolutions of electron density under different radius are presented, from which the equivalent electron lifetimes can be obtained. The influence of generator radius on electron lifetimes is very small near the ground. The spatio- temporal evolutions of main charged negative ions without carbon are presented, and compared with the evolution of negative ions with carbon. The re.suits are of great importance to the theoretical study and application of negative ion generator and the discharge filaments in dielectric barrier discharge.