大气压介质阻挡丝状放电时空演化数值模拟

通过数值求解二维流体方程，在均匀的初始条件下研究了大气压丝状放电的整体时空演化.通过模拟可以发现，在丝状放电的时空演化过程中，各条放电通道在不同位置相继发生击穿，且放电通道有遍历整个放电空间的趋势.在一定条件下，放电通道还会发生分裂与合并现象，其中放电通道的分裂导致了放电空间中放电通道的增加，而放电通道的合并则提供了一条放电空间中放电通道减少的途径.研究还表明，介质表面电荷是影响丝状放电整体时空演化的关键因素之一. 关键词： 介质阻挡放电 丝状放电 数值模拟 时空演化

Numerical simulation of filamentary discharge controlled by dielectric barrier at atmospheric pressure

The spatio-temporal evolution of filamentary discharge in dielectric barrier discharge at atmospheric pressure is studied. A two-dimensional model was solved with uniform initial conditions. The simulation results reveal that the breakdowns take place continuously at different positions and gradually spread all over the discharge space. It is found that under certain conditions the splitting and uniting of filaments can occur, which has been observed in experiments. The splitting of filaments leads to the generation of new filament and the uniting reduces the number density of filaments in discharge space. The simulation shows that the charges on barrier surface play a dominant role in determining the global spatio-temporal evolution of filamentary discharge.