高速气流条件下污秽颗粒在复合绝缘子表面的沉积判据

发布时间：2018-11-11 01:15

【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。
[Abstract]:The study of insulator fouling under the condition of high speed airflow is of great significance to the work of cleaning insulator and preventing pollution flashover under the condition of sandstorm, high speed operation of emus and so on. The deposition criterion of contaminated particles on the surface of composite insulator is proposed, and the computational fluid dynamics (CFD) model of fouling of composite insulator under the condition of high velocity airflow is established. Taking the high-voltage isolating switch insulator of EMU as an example, the validity of sediment criterion and computational fluid dynamics model is verified from the point of view of pollution distribution characteristics through experiments and comparison with related literature. The insulator fouling under different particle sizes is simulated and analyzed, which shows that the particle size has obvious influence on the insulator fouling. When the particle size is small, the vortex collision is the main way of impurity particle collision with insulator, and the collision and deposition may occur on the upwind and leeward surfaces. When the particle size is large, the inertial collision is the main way of impurity particle and insulator collision, the collision and deposition only occur on the upwind surface, and when the particle size is large enough, neither the upwind surface nor the leeward surface will be deposited.
【作者单位】：河北省输变电安全防御重点实验室(华北电力大学);中国电力科学研究院;
【基金】：国家自然科学基金资助项目(51207055)
【分类号】：TM216

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