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高压电器  2015 

强电场对低速气固两相流体运动影响的模拟试验研究

DOI: 10.13296/j.1001-1609.hva.2015.07.033, PP. 171-176

Keywords: 风沙,气固两相流体,流电耦合,人工模拟试验,PIV

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Abstract:

研究小粒径固―气混合流体在强电场区域的运动规律对于解释沙尘气候环境下线路绝缘子表面污秽沉积、间隙击穿、不明闪络等绝缘事故具有促进作用。文中基于人工模拟试验,利用PIV技术系统研究了低速混合流体的流电耦合运动规律,综合对比了电场不均匀度、电压等级、风速等因素对于流场分布的影响。结论发现在不均匀电场下,电场对于流场的作用要明显强于均匀电场,且随着外施电场强度的增加而增加,随风速的增加而有所减弱;均匀电场下粒子有向负极板运动的趋势,而不均匀电场下粒子因为电晕作用而荷电明显,易于向正极板运动。相关结论对于深化沙尘环境下输电线路外绝缘特性研究,特别是小粒径颗粒荷电机理具有积极意义。

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