低气压氙气介质阻挡放电的一维仿真研究

通过建立一个自洽耦合的一维流体模型来描述低气压氙气介质阻挡放电(DBD),并采用有限元法对模型进行数值仿真研究,得到了不同外加电压幅值和频率下的气体间隙压降、放电电流、介质表面电荷随时间的变化关系以及电子、离子、中性粒子和空间电场的时域分布.仿真结果表明:介质表面电荷对放电的点燃与熄灭起着关键的作用;在一个放电周期内,根据气体间隙压降的变化情况,介质表面电荷可按六个阶段进行分析;随着外施电压幅值的增加,间隙击穿逐渐提前至外施电压过零点之前发生,放电更为剧烈;随着外施电压频率的提高,气体间隙压降减小,间隙容易击穿,放电也更加均匀.粒子及空间电场的时域分布表明氙气DBD为典型的辉光放电.

One-dimensional simulation of low pressure xenon dielectric barrier discharge

A self-consistent one-dimensional fluid coupled model is built to describe the low pressure xenon dielectric barrier discharge (DBD). And the finite-element method is employed to investigate gas voltages, discharge currents and the time evolutions of surface charges on dielectric barrier under different applied voltage amplitudes and frequencies. The spatial and temporal distributions of electrons, ions, excited, resonance, metastable particles and spatial electrical field are also achieved. The simulation results show that the surface charges accumulated on the dielectric barriers play a key role in the ignition and the extinguishment of the discharge. And based on the variation of gas voltage, the surface charging can be divided into six stages in one discharge cycle. With the increase of applied voltage amplitude, the gas gap breakdown moves ahead of the zero-crossing point of applied voltage gradually, and the discharge becomes more and more intense. Furthermore, with the increase of applied voltage frequency, the gas voltage decreases gradually, gas gap tends to breakdown, and discharge becomes uniform. Finally, spatiotemporal distributions of particles and electric field indicate that the xenon DBD is a typical glow discharge.