摘要
本文以某钢桁梁斜拉桥为原型,采用数值模拟方法研究一种叶片式导风屏障对横风环境下列车周围流场、列车气动性能、桥梁气动性能的影响。结果表明:(1)叶片式导风屏障改变了桥梁内部的风场环境,减小了列车周围风速,风速最少减小20%;(2)高度为3 m时,列车周围的风速最低,列车三分力系数最优;(3)透风率为20%~25%时,列车周围风场受回流影响小,列车三分力系数中仅升力系数增大;(4)导风角为20°时,列车、桥梁三分力系数最小,且叶片式导风屏障自身承受的风荷载最小。综合考虑行车安全和建造成本,叶片式导风屏障的最佳高度为3 m,最佳透风率为20%~25%,最佳导风角为20°。
Based on a case study of a cable-stayed bridge with steel truss girders,the paper makes numerical simulation to study the impact of a vane-type wind deflector on the flow field around the train,the aerodynamic performance of the train,and the aerodynamic performance of the bridge under crosswind.The results show that:(1)The vane-type wind deflector changes the wind field inside the bridge,and reduces the wind speed around the train by at least 20%.(2)When the height of the deflector is 3 m,the wind speed around the train is the lowest and the three coefficients of the train are the optimal.(3)When the air permeability is 20%~25%,the wind field around the train is less affected by the backflow and only the lift coefficient increases.(4)When the wind guide angle is 20°,the three coefficients of the trains and bridges are the smallest,and the wind load borne by the vane-type wind deflector is the smallest.Considering the safety of train operation and construction cost,the optimal height of the vane-type wind deflector is 3 m,the optimal air permeability is 20%~25%,and the optimal air guide angle is 20°.
作者
吕娜
刘伟
谢海清
徐锡江
王超凡
LV Na;LIU Wei;XIE Haiqing;XU Xijiang;WANG Chaofan(Chengdu Yajia Engineering New Technology Development Co.,Ltd.,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Sichuan Tietuo Technology Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2022年第1期78-82,88,共6页
High Speed Railway Technology
关键词
铁路
桥梁
叶片式导风屏障
风屏障
三分力系数
风速折减率
透风率
railway
bridges
vane-type wind deflector
wind deflector
three coefficients
wind speed reduction rate
air permeability
