线路环境对路堤上列车气动性能的影响  

Effect of railway environment on aerodynamic performance of train on embankment

作　　者：苗秀娟[1,2] 田红旗[1] 高广军[1] 

机构地区：[1]中南大学交通运输工程学院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：《中南大学学报（自然科学版）》2010年第5期2028-2033,共6页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2006BAC07B03)

摘　　要：基于三维定常N-S方程和从风-车-路-场耦合条件下车辆周围的流场结构,分析路堤不同结构形式对列车气动性能的影响。研究结果表明:当路堤迎风面、背风面斜率一致时,随着坡度的减小,横向力与倾覆力矩呈增大的趋势;当cotα从1.5变为2.0时横向力和倾覆力矩变化非常明显,分别增加25.4%和72.3%,其后气动力变化不明显;当迎风面一定时,随着背风面由斜向上逐步向下倾斜直至成为平地,横向力和倾覆力矩以及升力呈显著增大的趋势;与cotβ=2.0时相比,cotβ=∞即背风面为平地时车辆的横向力和倾覆力矩分别增加63.9%和55.2%。The effect of different structures of embankment on train aerodynamic performance was analyzed based on the 3-D steady flow N-S equations and the flow structure around the train on the condition of combination of wind and train and railway line and its environment.The results show that when the slop of windward and leeward side of embankment are the same,side force and overturning moment increase with the decrease of the slope of embankment.The side force and overturning moment change obviously when cot α changes from 1.5 to 2.0 increasing by 25.4% and 72.3% respectively,while after that they change very little.When windward side slope is fixed side force and overturning moment increases obviously with the slope of leeward changing from upward-slope to downward-slope gradually until to plane ground.Compared to cot β=2.0,side force and overturning moment increase by 63.9% and 55.2% respectively when cot β=∞ which means that the leeward of the embankment is a plane.

关 键 词：车辆工程 路堤 气动性能 数值模拟 

分 类 号：U270.1[机械工程—车辆工程]