基于流体力学原理的绝缘子覆雪三维数值模拟

来源:用户上传      作者:胡玉耀 宗春郁 蒋兴良 咸日常 耿凯 杜钦君

　　摘要：电线路覆冰积雪严重影响电网的安全稳定运行.目前的研究重点关注绝缘子覆雪放电发展过程及闪络特性.由于绝缘子结构复杂，对覆雪的增长过程缺乏系统的分析.本文基于计算流体力学原理，在不同的环境参数条件下，对XP-70绝缘子表面不同位置的雪晶颗粒碰撞特性进行了理论分析和仿真计算，在此基础上建立了绝缘子三维覆雪数值计算模型.研究表明，在气流绕流绝缘子过程中，存在降压增速和增压减速两个相反的过程;绝缘子迎风侧局部碰撞系数从前驻点处沿钢帽或伞裙向两侧逐渐减小，迎风侧伞裙边缘和钢帽处的局部碰撞系数远远大于其他位置，最大可达0.74.绝缘子表面的覆雪量随风速（v）、液态水含量（LWC）以及颗粒直径（MVD）等环境参数的增大而增大，覆雪量最大可达2.19 kg.经仿真和试验验证，局部碰撞系数最大的位置，覆雪最严重，而且试验和模型仿真结果的误差小于17%.
　　关键词：绝缘子;覆雪;计算流体力学;局部碰撞系数;三维数值模拟
　　中图分类号：TM85文献标志码：A
　　Three-dimensional Numerical Simulation of Snow Accretion on Insulator Based on Principle of Fluid Mechanics
　　HU Yuyao ZONG Chunyu JIANG Xingliang XIAN Richang GENG Kai DU Qinjun1
　　（1. School of Electrical and Electronic Engineering，Shandong University of Technology，Zibo 255000，China;
　　2. State Key Laboratory of Transmission and Distribution Equipment and System Safety and New Technology （Chongqing University），Chongqing 40004 China;
　　3. Shandong Huineng Electric Co.，Ltd，Zibo 255089，China）
　　Abstract：Ice and snow accretion on transmission lines seriously threatens the secure and stable operation of the power system. Current research focuses on the discharge development and flashover characteristics of snow-covered insulators. Due to the complexity of the insulator，the growth of snow accumulation remains a lack of systematic analysis. In this paper，based on computational fluid dynamics （CFD），the local impact characteristics of snow particles on XP-70 insulator were simulated and analyzed under different environmental parameters，subsequently，a three-dimensional numerical calculation model was established. The results show that there are two opposite processes during flow around an insulator，namely，the pressure decrease accompanied by the increase of the velocity as well as the increase of the pressure with the decreasing velocity. Local collision coefficient on the windward side of the insulatorgradually decreases along with the steel or the shed from the front stagnation point to both sides. The coefficient at the edge of the shed and the steel cap of the windward side of the insulator is much higher than that of other positions，and the maximum value can reach 0.74. Snow accumulation on the insulator increases with the increase of v，liquid water content （LWC）and median volume diameter （MVD）. Its maximum is 2.19 kg. It is verified by the simulation and test that snow accretion is the heaviest at the location where the local collision coefficient is the largest，and the error between the two is less than 17%.

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