外磁场作用下的介质阻挡面放电研究

通过计算包含等效磁场的介质阻挡面放电漂移-扩散方程组,分析了磁场方向、磁感应强度对介质阻挡面放电下的电子浓度、离子浓度、放电稳定性以及等离子体体积力的影响,证明不同方向的磁场通过影响电子扩散对放电过程产生了膨化、压缩2种作用,提出了膨化磁场、压缩磁场概念。计算结果表明:外部磁场对离子扩散的影响较弱,没有明显改变等离子体静电场体积力的分布,与等离子体静电场力相比磁力基本可以忽略,且磁场使得介质阻挡面放电更容易失稳。

Study of Dielectric Barrier Surface Discharge in External Magnetic Field

The dielectric barrier surface discharge （DBDs） in magnetic field is simulated by drift- diffusion equation. The influence on electron density, ion density, discharge stability and plasma body force is analyzed due to magnetic field direction and magnetic .induction. It is proved that magnetic field affects the discharge process through affecting electron shift which results in that the discharge is expanded or constricted rested with the magnetic field direction, then the concept of expanding and constricting magnetic field is proposed. But ion shift is affected slightly by magnetic field, so the plas- ma electrostatic body force does not change obviously, the magnetic force can be neglected comparing with electrostatic body force, and magnetic field leads to the DBDs discharge more unstably.