摘要
研究高速气流条件下的绝缘子积污对沙尘暴、动车组高速运行等状况下的绝缘子清洗、预防污闪等工作具有重要指导意义。提出了污秽颗粒在复合绝缘子表面的沉积判据,结合该判据建立了高速气流条件下复合绝缘子积污的计算流体力学(CFD)模型。以动车组高压隔离开关绝缘子为对象进行了算例分析,通过实验以及与相关文献结果对比,从污秽分布特性的角度验证了沉积判据及计算流体力学模型的有效性。仿真分析了不同粒径下的绝缘子积污,表明粒径对绝缘子积污有较为明显的影响。当粒径较小时,漩涡碰撞为污秽颗粒与绝缘子碰撞的主要方式,此时碰撞和沉积可能发生在迎风面和背风面;当粒径较大时,惯性碰撞为污秽颗粒与绝缘子碰撞的主要方式,此时碰撞和沉积只发生在迎风面;当粒径大到一定程度时,迎风面和背风面均不会发生沉积。
The studies of insulators contamination under high speed aerosol condition make great contributions to the cleanin g and prevention of pollution flashover under the condition of sandstorm or high speed operation of electric multiple units （ EMU s） . The deposit criterion of contamination particles on the surface of composite insulators is proposed in this paper. Then the computational fluid mechanics （ CFD） model of composite insulators contamination under high sp eed aerosol condition is establ ished. The valid ities of the deposit criterion and the CFD model are verified in the pollution particle distribution character perspective by the experiments results and the references which gave an exponential analysis of the insulators with high voltage isolating switch in EMUs. The simulation analyzes the composite insulator contamination under different particle sizes and indicates that particle size has an obvious in fluence on the insulator contamination. When the particle size is small, eddy collision is the main way of collision between contamination particulates and insulators. So the collision and deposition may occur on windward and leeward sides. When the size is larger, the inertial impaction is the main mode. Therefore, the collision and deposition only occur on the windward side. When the size is large enough to a certain extent, the deposition will never occur on both windward and leeward sides.
出处
《电工技术学报》
EI
CSCD
北大核心
2017年第1期206-213,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51207055)
关键词
高速气流
绝缘子积污
沉积判据计算
流体力学模型
High speed aerosol, composite insulators contamination, deposit criterion, computational fluid mechanics （CFD） model
