不均匀电场中憎水性表面分离水珠放电过程研究

通过实验室模拟并结合ANSYS有限元分析软件对不均匀电场中憎水性表面分离水珠的放电过程进行了计算,得出憎水性表面分离水珠放电是由两端向中间发展的电弧连接所致,并存在明显熄灭重燃现象。比较了不均匀电场下,无水珠、单个水珠以及多个水珠存在时憎水性表面沿面电场分布的变化情况,无水珠存在的憎水性表面的电场呈两端高,底部大致平滑的“U”型分布,强电场区域出现在电极两端,最大值为3.19kV/cm;单个水珠的电场强度最高的地方仍出现在尖极处,最大值为3.9kV/cm,水珠表面电场最弱,约为0.35kV/cm;多个分离水珠存在的情况下,电场不均匀度增加,水珠周围电场较强,最大场强出现在距离两极最近的水珠周围并且在水珠靠近两端一侧,最大值为4.6kV/cm,其余区域相对较弱;计算出有水珠存在时的最大场强是无水珠时的1.22～1.44倍。

Study on Discharge Process of Discrete Water Drops on the Hydrophobic Surface in Non-uniform Electric Field

According to simulating tests on the model sample combining with ANSYS finite elements analysis software, the discharge process of discrete water drops on the hydrophobicity surface in non-uniform electric field was studied and computed. The results show that the discharge is caused by partial arc connection developed from both ends to electrodes to center and exist visible extinguishing and rekindling phenomena. The electric field distribution variation along the hydrophobic surface having one or more water drops or no water drops. The electric field along hydrophobic surface without water drops has a U-shape distribution with high electric stress at both ends of electrode, 3.19 kV/cm maximum. The highest electric stress on single water drop appears at peak, 3.9 kV/cm maximum, and the lowest electric stress falls in drop surface, 0.35 kV/cm approximately. Field non-uniformity rises in case at presence of discrete water drops with highest stress of 4.6 kV/cm existing on nearest side of water drops adjacent to both electrodes, the stresses at other zones are moderate. The computation result shows that the maximum electric field intensity at presence of water drops is 1.22-1.44 higher times than that without water drops.