兰新高铁大风区段挡风墙对接触网正馈线气动特性的影响  

Influence of wind-break wall on aerodynamic characteristics of positive feeder of overhead contact line of Lanzhou-Xinjiang high-speed railway

作　　者：张友鹏[1] 王彤[1] 赵珊鹏 王思华[1] ZHANG Youpeng;WANG Tong;ZHAO Shanpeng;WANG Sihua(School of Automatic & Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省轨道交通电气自动化工程实验室,甘肃兰州730070

出　　处：《铁道科学与工程学报》2019年第7期1628-1636,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51867013,51567014,51767014);中国铁路总公司科技研究开发计划项目(2016J010-C)

摘　　要：为研究兰新高铁大风区段挡风墙对接触网正馈线气动特性的影响,基于流体力学建立正馈线流场模型,分别针对无墙和有墙的情况,分析正馈线在不同风速下气动特性的变化规律。研究结果表明:挡风墙对气流有较强的汇聚作用,大幅增加了正馈线周围的空气流动速度。随着来风速度的增大,挡风墙后正馈线处风攻角也随之增大,当风速达到15 m/s 及以上时,攻角基本稳定在29°~30°之间。有墙条件下正馈线升力及阻力系数幅值加大且呈现无规律振荡,挡风墙对正馈线气动力的增大效应是导致正馈线发生低频高幅舞动的主要原因。挡风墙外形尺寸对于正馈线气动特性有重要影响,选择合适的高度和截面宽度可一定程度改善正馈线气动特性,以减少舞动的发生。The main purpose of this research is to study the influence of the wind -break wall on the aerodynamic characteristic of the catenary positive feeder, situated at the gale section of the Lanzhou-Xinjiang railway line. To achieve it, a flow model of the positive feeder, based on the fluid mechanics, was established, analyzing the change rule of aerodynamic characteristic of the positive feeder under the circumstances of whether there are walls or not. Through the analysis above, a conclusion was obtained, where the ambient air velocity could be influenced by the wind -break wall and so could the angle of the wind. Specifically, the higher the air velocity is, the larger the angle is, except the situation where the attack angle remains from 29 to 30 under the 15m/s wind or more. The aerodynamic force of positive feeder line with walls is greater than that without walls. In addition, the increase of aerodynamic force of the positive feeder, attributed to the wind -break wall, can be mainly responsible for galloping of the positive feeder. The size of the walls has an important influence on the aerodynamic characteristics of the positive feeder. The selection of appropriate height and cross section width can effectively improve the aerodynamic characteristics of the positive feeder and reduce the occurrence of galloping.

关 键 词：兰新高铁接触网 大风区 正馈线 挡风墙 气动特性 

分 类 号：U225.1[交通运输工程—道路与铁道工程]