动车组支柱绝缘子伞裙不同部位积污特性的仿真研究

Simulation Research on Characteristic of Contaminations on Different Parts of Post Insulator Shed for EMU

为研究动车组支柱绝缘子伞裙不同部位积污特性,将动车组支柱绝缘子伞裙分为迎风面、背风面和侧风面,建立了积污特性的流场计算模型,以质量沉积率为表征积污特性的参数,分析了不同部位质量沉积率与污秽颗粒粒径、气流速度之间的关系,比较了不同部位质量沉积率的差异性。仿真结果表明:迎风面和侧风面质量沉积率随污秽颗粒粒径的增大而增大,背风面质量沉积率随污秽颗粒粒径的增大而减小;不同部位质量沉积率与气流速度的关系受污秽颗粒粒径的影响,当污秽颗粒的粒径大于10μm时,随着气流速度增大,迎风面和侧风面质量沉积率增大,背风面质量沉积率保持为0,在相同污秽颗粒粒径和气流速度条件下,迎风面质量沉积率大于侧风面,而当污秽颗粒的粒径小于10μm时无上述规律。

To investigate multiple units （EMU）, a the characteristics of contamination on different computational fluid dynamics （CFD） model of the by dividing the shed into windward side,leeward side and crosswind side. parts of insulator shed for electric contamination characteristics is buih The relations of the mass deposition rates of the three parts of the insulator shed with the contamination particle size and the wind speed are analyzed, and the differences of the mass deposition rates are compared. Simulation results show that： 1） with the increase in particle size, the mass deposition rates of windward side and crosswind side increase, but the mass deposition rate of leeward side decreases; 2） the particle size has a great impact on the relationship between the mass deposition rate and wind speed, e.g. when the particle size is larger than 10 μm, the mass deposition rates of windward and crosswind sides ascend while the mass deposition rate of leeward side keeps zero with increasing wind speed, and the mass deposition rate of windward side is larger than that of crosswind side for same particle size and wind speed, however, there is no such rules if the particle size is smaller than 10 μm.