高速列车弓网电弧温度场特性仿真研究

Numerical Simulation and Analysis of Temperature Distribution of Pantograph-catenary Arc Characteristics of High-speed Train

弓网离线过程中会产生弓网电弧。弓网电弧稳态燃烧时,弧心温度很高。同时,电弧等离子体对接触网导线和受电弓滑板的热传导造成弓网系统材料的电气磨损,降低弓网系统使用寿命,严重情况时会导致列车事故。由于现有试验条件的限制,难以直接采用试验方式准确测试出电弧等离子体的温度分布。因此基于流体动力学理论,建立了弓网电弧稳态燃烧的物理分析模型,并采用流体分析软件,对模型方程进行求解,得出了电弧等离子体、接触线内部以及滑板内部的温度场分布情况。通过仿真计算不同接触线廓形半径情况下接触线内部的温度场分布情况,发现增大廓形半径可以降低接触线表面材料的电气磨损。同时,随着滑板材料热导率的增加,也可以降低滑板材料的电气磨损。

The pantograph-catenary arcing phenomena may occur during the off-line process of pantograph-catenary system. During arcing, the temperature of arc column is very high. What＇s more, thermal conduction from arc plasma to catenary wire and pantograph strip will cause the serious electrical ablation to the material, shorten their lifespan and even cause some serious accident. Due to the limit of the existing experiment testing technology, it is really hard to know di- rectly the exact temperature distribution of arc plasma. Consequently, using the magnetohydrodynamics method, we built the model of pantograph-catenary arcing. By using fluid analysis software, those fimctions were solved. The temperature distribution of arc plasma, catenary wire, and pantograph strip have been achieved. Based on the temperature distribution of catenary wire under different catenary wire radius, it is found that, with the increase of catenary wire radius, the electric ablation of catenary wire can be reduced to a certain degree. What＇s more, it is found that ,with the increase of thermal conductivity of pantograph strip material, the electric ablation of pantograph strip will be reduced.