Wind tunnel tests on aerodynamic characteristics of vehicles on same-storey highway and rail bridge under crosswind  

横风作用下公铁同层桥上汽车-列车的气动特性风洞试验研究

作　　者：ZOU Yun-feng XUE Fan-rong HE Xu-hui HAN Yan LIU Qing-kuan 邹云峰;薛繁荣;何旭辉;韩艳;刘庆宽(School of Civil Engineering,Central South University,Changsha 410075,China;Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure,Changsha 410075,China;School of Civil Engineering and Architecture,Changsha University of Science&Technology,Changsha 410004,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]School of Civil Engineering,Central South University,Changsha 410075,China [2]Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure,Changsha 410075,China [3]School of Civil Engineering and Architecture,Changsha University of Science&Technology,Changsha 410004,China [4]State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China

出　　处：《Journal of Central South University》2022年第8期2513-2531,共19页中南大学学报（英文版）

基　　金：Projects(52078504,51822803,51925808,U1934209)supported by the National Natural Science Foundation of China;Project(KF2021-05)supported by the State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,China。

摘　　要：In recent years,the safety and comfort of road vehicles driving on bridges under crosswinds have attracted more attention due to frequent occurrences of wind-induced disasters.This study focuses on a container truck and CRH2 high-speed train as research targets.Wind tunnel experiments are performed to investigate shielding effects of trains on aerodynamic characteristics of trucks.The results show that aerodynamic interference between trains and trucks varies with positions of trains(upstream,downstream)and trucks(upwind,downwind)and numbers of trains.To summarize,whether the train is upstream or downstream of tracks has basically no effect on aerodynamic forces,other than moments,of a truck driving on windward sides of bridges(upwind).In contrast,the presence of trains on the bridge deck has a significant impact on aerodynamic characteristics of a truck driving on leeward sides(downwind)at the same time.The best shielding effect on lateral forces of trucks occurs when the train is located downstream of tracks.Finally,the pressure measuring system shows that only lift forces on trains are affected by trucks,while other forces and moments are primarily affected by adjacent trains.横风作用下桥上车辆的运行安全性和舒适性已得到越来越多的关注。准确了解桥上车辆气动特性是评估强风作用下行车安全性和舒适性的基本前提。由于公铁同层桥上汽车和列车存在显著的相互气动影响,使得车辆气动特性更为复杂。本文以集装箱卡车和CRH2高速列车为例,通过风洞试验对某大跨公铁同层桥上车辆气动特性开展研究。试验结果表明,公铁同层桥上列车与公路车辆之间的空气动力干扰随着列车(轨道上游,轨道下游)和公路车辆(迎风侧,背风侧)的位置以及轨道上放置的列车数量而变化;列车对上游的公路车辆气动力影响较小,对下游的公路车辆影响较大,且公路车辆侧力系数受列车干扰效应最为显著;桥上公路车辆仅对列车有限宽度的表面压力分布有影响,对该范围内的列车升力系数影响最大,列车的其他气动力则主要受相邻列车气动干扰的影响。

关 键 词：same-storey highway and rail bridge container truck CRH2 high-speed train aerodynamic characteristics wind tunnel test CROSSWIND 

分 类 号：U461[机械工程—车辆工程] U270.1[交通运输工程—载运工具运用工程]