大气压氦气介质阻挡辉光放电的数值仿真计算

通过精心选择一维模拟计算所需要的各个参数,使用有限差分法数值求解了大气压氦气介质阻挡辉光放电数学模型中的离子连续方程、电子连续方程、泊松方程以及相关的辅助方程,得到了与实验吻合度很好的仿真波形。在此基础上计算了电场、离子密度、电子密度等放电空间内部参量随时空的演化图,这些参量对定量分析大气压氦气辉光的放电机理有重要作用。从理论上对所得到的计算结果做出了解释,并使用仿真结果很好地解释了实验所拍摄到的放电图像。

Numerical modeling of dielectric-barrier atmospheric pressure glow discharge in helium

Atmospheric pressure glow discharge in a 5-mm helium gap between two plane-parallel electrodes each covered by a 1-mm thick quartz plate was numerically simulated.One-dimensional and self-consistent fluid model of the discharge was established.The model is based on the electron and ion continuity and momentum transfer equations coupled to Poisson's equation.The values of the physical coefficients involved in the equations as well as the initial conditions and the boundary conditions were carefully determined.Based on finite differential method and Newton iteration method,the equations were numerically solved.The calculated waveforms of the discharge current and the gas voltage agree well with the measured ones,indicating that the established physical model and the numerical methods are correct.The temporal and spatial distributions of the electric field,the electron density and the ion density look quite similar to that obtained in the glow discharge at low pressure,which confirms that the dielectric barrier discharge in helium at atmospheric pressure is really a glow discharge.