【作者】 张勇；

【导师】 邓斌；

【作者基本信息】 西南交通大学 ， 机械电子工程， 2011， 硕士

【摘要】 为提高兰新线铁路运输能力,铁道部将对其进行电气化改造。然而在新疆百里风区,电气化改造后强风通过挡风墙在接触网处形成的风速和上吹角影响不容忽视。挡风墙位置和高度发生变化时,将直接影响接触网处的风速和上吹角,较大的风速和上吹角将引起较多的横向偏移和抬升量,引起弓网受流不稳定,导致弓网故障。目前兰新线修建的挡风墙,对列车运行起到一定防护作用,但没有考虑其引起风的风速和上吹角对接触网产生的影响,强风对接触网的结构强度、稳定性产生的影响需做进一步的研究。本文以计算流体动力学为基础,采用高雷诺数κ-ε紊流模型进行模拟计算。挡风墙模型采用目前常用于兰新线的土堤式挡风墙、对拉式挡风墙和钢筋混凝土挡沙墙。通过改变挡风墙结构和参数,建立各种参数下的计算模型,通过计算得出对不同路况下挡风墙参数变化对接触网的影响,分析确定较好的挡风墙参数。利用计算得到的挡风墙参数,选择车辆倾覆力矩较小的棚车模型作为计算模型,计算车辆气动力,研究不同路况条件下的车辆倾覆稳定性。同时提取接触网处风速和上吹角,建立接触网风场模型,进行接触网气动力的计算。选择较好的挡风墙参数,不仅可以保证车辆倾覆稳定性良好,还可以确保接触网受力较小。本文对于挡风墙和接触网风场计算结果可用于大风区接触网的结构设计。更多还原

【Abstract】 Ministry of Railways intends to carry out the electrification transformation on Lanchow-Sinkiang Railway to improve the transportation capacity. But in the Xinjiang hundred-mile wind field, the change of wind velocity and elevation on the contact net is very important after the electrification transformation. The change of the position and height of wind-break wall affects the velocity and elevation on contact net directly. The bigger velocity and elevation angle, the bigger excursion and elevation. The big excursion and elevation bring malfunction to pantograph and net because of the instable electricity. The current wind-break wall can protect the train in a certain extent, without considering the influence of the wind velocity and elevation. The influence of the strong wind on the contact net needs more research.This article takes Computational Fluid Dynamics as a foundation, and uses the K-s/High Reynolds Number turbulent model to run the numerical simulation. The wind-break wall models use the earth type wind-break wall, the tendon type wind-break wall and reinforced concrete sand-break wall which are usually used on Lanchow-Sinkiang Railway. With the change of the wind-break wall parameters, establish the models with the different parameters. After calculations, we can get the wind number on contact net with the different parameters, and then we can choose the good parameters. The next calculation uses the van train model to calculate the aerodynamic force of the train, and then research the capsized torques of the train with the different railway. We can get the wind velocity and elevation angle, establishing the contact net model to calculate the aerodynamic force of the contact net. With good wind-break wall parameters, we can ensure the security of the train and the small aerodynamic force on contact net. The calculated result about the wind-break wall and contact net can be used in configuration design of contact net.更多还原