峡谷风对桥梁上列车气动性能的影响  

The Influence of the Gorge Wind on the Aerodynamic Performance of the Train on Bridge

作　　者：苗秀娟[1,2] 田红旗[1] 高广军[1] 

机构地区：[1]中南大学轨道交通安全教育部重点实验室,湖南长沙410075 [2]长沙理工大学汽车与机械工程学院,湖南长沙410076

出　　处：《中国铁道科学》2010年第6期63-67,共5页China Railway Science

基　　金：国家"十一五"科技支撑计划项目(2006BAC07B03)

摘　　要：基于标准κ—ε双方程湍流模型,分析运行在跨峡谷桥梁上的列车外部稳态流场,研究不同峡谷间距、列车在桥上不同位置时峡谷风对列车气动性能的影响规律。计算结果表明:在同样风速条件下,峡谷间距越小,对气流的加速作用越明显,当峡谷间距分别为150,200,250和300m时,桥梁上方的风速分别增加了17.5%,11.6%,7.2%和3.4%;峡谷间距150m时车辆受到的侧向力、升力和倾覆力矩比300m时分别增大约25.7%,84.5%和21.1%;列车处于峡谷中间位置时受到的气动力最小,列车处于刚进入峡谷位置时受到的气动力最大,后者比前者车辆受到的侧向力、升力和倾覆力矩分别增大了5.5%,8.2%和7.8%。The outer steady flow field around the train running on the bridge at the narrow valley was analyzed,and the influences of the valley width and the location of the train on the bridge on the aerodynamic performance of the train were studied based on standardκ—εtwo-equation turbulence model.The results show that the smaller is the valley width,the more obvious is the wind accelerating action under the same wind speed.When the valley width is 150,200,250and 300m,the wind speed above the bridge has increased 17.5%,11.6%,7.2%and 3.4%respectively.The side force,the lift force and the overturning moment of the train in 150mwide valley increase 25.7%,84.5%and 21.1%respectively than that of the train in 300mwide valley.The aerodynamic force is the smallest when the train is in the middle of the valley while the largest when the train is just entering into the valley.The side force,the lift force and the overturning moment of the latter increase 5.5%,8.2%and 7.8%respectively than that of the former.

关 键 词：列车 通过桥梁 环境风 气动性能 数值模拟 

分 类 号：U270.11[机械工程—车辆工程]