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基于FEM-FCT算法的SF6/N2混合气体中棒-板间隙电晕放电特性的仿真研究

, PP. 261-267

Keywords: 棒-板间隙,流注电晕,有限元,通量校正传输,混合气体

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Abstract:

为研究棒-板间隙中SF6/N2混合气体流注电晕放电特性,采用二维流体力学模型,基于不固定网格剖分,利用有限元-通量校正传输(FEM-FCT)法求解含带电粒子的连续方程,并耦合泊松电场研究空间电荷对场域的畸变作用。实现了50%~50%SF6/N2混合气体二维流注电晕放电过程的仿真,考虑了带电粒子及中性气体分子的电离、吸附、复合、扩散等过程。并首次综合考虑SF6/N2混合气体中空间光电离与阴极光发射在流注放电过程中的作用。研究了棒头半径和间隙距离与流注电晕放电的关系以及SF6含量对混合气体放电的影响。仿真结果表明当间隙距离不变(d=4mm),逐渐减小棒头半径或棒头半径不变(r=1mm),间隙距离逐渐减小时,都可使流注电晕放电从相对稳定过渡到不稳定,进而放电会持续向前发展;50%~50%SF6/N2混合气体发展为不稳定放电的电压高于纯SF6气体和10%~90%SF6/N2混合气体。

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