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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第10卷    第6期    总第56期    2013年12月

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文章编号:1672-7029( 2013) 06-0001-06
侧风下挡风墙对CRH2列车-简支梁桥气动性能的影响
何旭辉,杜风宇,冉瑞飞,赖慧蕊

(中南大学土木工程学院,湖南长沙410075)

摘 要: 以CRH2列车、京沪高铁上32 m 简支梁桥为研究对象,采用商业计算流体力学软件Fluent,基于三维、定常N-S 方程和Realizable k-ε 湍流模型,进行侧风作用下挡风墙对车桥系统气动性能影响的数值模拟计算。通过雷诺数、挡风墙等价透风率、挡风墙高度、透风率及风偏角的改变,对车桥气动性能进行研究。计算结果表明: 雷诺数对列车气动性能有一定影响。挡风墙高度的增加会使作用于桥梁上的侧力和力矩系数增大,升力系数则变化不明显。在等价透风率挡风墙下栏杆数量多的挡风墙挡风效果优于栏杆数量少的挡风墙。挡风墙高度并非越高越好,而是有一个合理的高度范围。在同一高度挡风墙下,列车气动力系数随着透风率的增大而增大。风偏角对列车气动性能影响的规律基本一致。

 

关键字: 挡风墙; 气动性能; 数值模拟

Influence of wind-break wall on aerodynamic performance of CRH2 train-simply supported bridge under crosswind
HE Xuhui,DU Fengyu,RAN Ruifei,LAI huirui

School of Civil Engineering,Central South University,Changsha 410075,China

Abstract:CRH2 train and simply supported bridge of 32 m at Beijing—Shanghai high-speed railway were chosen to study the effect of wind-break wall on aerodynamic characteristics of vehicle-bridge system under crosswind.The numerical simulation was carried out by software of Computational Fluid Dynamics,Fluent,based on three-dimensional steady N-S equation and Realizable k-ε turbulent model.The analysis of aerodynamic characteristics of vehicle-bridge system was taken under various Reynolds numbers,equivalent ventilation ratio of wind-break wall,ventilation ratio,height of wind-break wall and wind deflection angle.The results show that: Reynolds number influences aerodynamic characteristics of vehicle to some extent.The increase of wind -break wall’s height will raise side force coefficient and moment coefficient,and show less obvious effect on lift coefficient.Wind-break wall with more railings has better windproof effect than those with less ones which share equivalent ventilation ratio.Higher wind-break wall is not always better and it means that there is a reasonable height range.Increasing ventilation ratio will raise aerodynamic coefficients of vehicle with the same wind-break wall’s height.Wind deflection angles’ influence on aerodynamic performance of train is basically consistent.

 

Key words: wind-break wall; aerodynamic characteristics; numerical simulation

ISSN 1672-7029
CN 43-1423/U

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