强风环境下棒形绝缘子积污动态仿真分析

为探讨高速铁路绝缘子表面的积污特性,分析了污秽颗粒在强气流环境中的受力情况,建立了QBJ-25/20型绝缘子积污的仿真模型.以绝缘子伞裙表面污秽的体积分数反映其积污状况,得到了绝缘子伞裙上、下表面积污与风速及来流角度之间的关系.结果表明:在高速气流中,绝缘子表面积污量与来流角度、气流速度呈负指数关系；当来流角度在0°～90°之间时,伞裙上表面受来流角度的影响较大,而下表面受气流速度的影响更明显；积污量随污秽颗粒直径增大呈先增大后减小的趋势.

Dynamic Simulation Analysis of Bar Insulator Pollution in Strong Wind

In order to probe into the pollution characters of the surface of an insulator used in high-speed railway,forces on polluted particles in a strong wind environment were analyzed,and a simulation model for pollution of QBJ-25/20 type bar insulator was established.By taking the pollution volume fraction of insulator shed as the index of pollution measure,the relationships between the volume fraction and wind velocity and wind coming angle were obtained.The research result shows that in a strong wind condition there is a negative exponential relationship between the volume fraction and the coming angle,and there exists the same rerelationship between the volume fraction and the wind velocity.The pollution on the upper surface of the shed is mainly influenced by the coming angle ranging from 0° to 90°,while the pollution on the lower surface of the shed is seriously affected by the wind velocity.With the increase of polluted particles’ diameters,the volume fraction shows a trend of first increase and then decrease.