风沙环境下动车组车顶绝缘子冲蚀磨损的仿真研究

Numerical Simulation of Particle Impact Erosion on Insulator of Locomotives under Wind Sand Environment

为研究动车组车顶支柱绝缘子不同部位的冲蚀磨损情况,采用RNG K-epsilon湍流模型及离散相模型,实现了对绝缘子冲蚀磨损的数值模拟。仿真结果表明,绝缘子伞裙边缘的磨损速率随位置的变化呈"M"状分布,最大磨损位置为45°角附近;仿真结果与试验验证结果能够较好吻合,可为风沙环境下绝缘子结构的优化及运行寿命预测提供依据;伞裙迎风面各部位的冲蚀磨损率随着气流速度及沙尘颗粒粒径的增大而增大,且最大冲蚀磨损率位置向外侧偏移。

In order to research on the erosion wear of different parts of insulators sheds of EMU, the numerical simulation of insulator erosion wear based on the RNG k-epsilon turbulence model and dis- crete phase model is performed. Simulation results show that, wear rate of the edge of insulator umbrella skirt changes with the position of a ＂M＂-like distribution, maximum wear position for 45 degree angle near. Simulation results and experimental verification results are in good agreement, and can provide ref- erence for insulator structure optimization and the service life prediction under aeolian environment. Each position of the shed skirt on the windward side erosion rate increases with increasing particle size of dust, and the position of maximum erosion wear rate moves backward. The erosion wear rate of each position of the shed skirt windward surface increases with the increase of air velocity.