摘要
降雨条件下绝缘子表面积雨分布是诱发雨闪的关键因素,为分析绝缘子积雨特性,构建了雨滴吸附在绝缘子表面的判据,建立了风洞仿真模型。研究表明：迎风面积雨严重,雨滴受强曳力作用侧风面积雨较轻,背风面存在湍流,少量雨滴绕到背风面并吸附在其表面。随着降雨强度增大,迎风面积雨质量流量呈现先增加后减缓的趋势,侧风和背风面积雨质量流量呈现增加并趋于稳定的趋势;随着入口风速增大,迎风和侧风面单位时间积雨量逐渐增加并增速减缓,背风面在来流角为90°时积雨量逐渐减小,来流角〈90°时逐渐增大;随着来流角增大,迎风面积雨量逐渐增大,侧风和背风面积雨量逐渐减小。
Under rain conditions, the rain distribution on insulators is a key factor in inducing rain flash. In order to analyze rainfall deposition characteristics, we determined a criterion of raindrops adsorbed on insulator, and established a simulation model of wind tunnel.Furthermore,we analyzed the rainfall deposition characteristics of insulator,and researched a relationship of rainfall deposition and rainfall intensity and high-speed airflow. It is found that the rainfall deposition at windward is more serious than that at lateral side and lee side. Under a strong drag force, the rainfall deposition at lateral side is less. And due to turbulence, a small amount of raindrop moves to lee side and is adsorbed on it. With rainfall intensity increasing, rainfall deposition per unit time at windward first increases and then declines, but rainfall deposition per unit time at lateral and lee side gradually increases and becomes steady. With the inlet velocity increasing, rainfall deposition per unit time at windward and lateral side gradually increases and the increment rate slows down, rainfall deposition per unit time at lee side gradually reduces under 90° of inflow angle, and that gradually increases under less than 90° of inflow angle. With the inflow angle increasing, rainfall deposition per unit time at windward gradually increases, but rainfall deposition per unit time at lateral and lee side gradually reduces.
作者
高波
包健康
曹桂
康永强
张血琴
吴广宁
GAO Bo;BAO Jiankang;CAO Gui;KANG Yongqiang;ZHANG Xueqing;WU Guangning(College of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China;Electric Power Research Institute, State Grid Chongqing Electric Power Company, Chongqing 401123, China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第6期1938-1945,共8页
High Voltage Engineering
基金
国家自然科学基金(U1234202
51507146)~~
关键词
高速气流
风洞
车顶绝缘子
积雨
降雨强度
入口风速
来流角
high-speed airflow
wind tunnel
roof insulator
rainfall deposition
rainfall intensity
inlet wind velocity
in-flow angle
