Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting  

列车通过平地至路堑挡风墙过渡区域的动态行为及缓解措施

作　　者：CHEN Zheng-wei LIU Tang-hong GUO Zi-jian HUO Xiao-shuai LIWen-hui XIAYu-tao 陈争卫;刘堂红;郭子健;霍小帅;李文辉;夏玉涛(Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China;Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China;Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Changsha 410075,China;National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075,China)

机构地区：[1]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China [2]Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China [3]Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Changsha 410075,China [4]National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075,China

出　　处：《Journal of Central South University》2022年第8期2675-2689,共15页中南大学学报（英文版）

基　　金：Project(2020YFA0710903)supported by the National Key R&D Program of China;Project(U1334205)supported by the National Natural Science Foundation of China;Project(1-W16W)supported by the Hong Kong Polytechnic University's Postdoc Matching Fund Scheme,China。

摘　　要：In this paper,the effects of a right-angle windbreak transition(RWT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transition(OST)was proposed to reduce the impact of RWT on the train aerodynamic and dynamic performance.The results showed that in the RWT region,the airflow was divided into two parts.One part of the airflow induced a strong backflow in the flat ground position,and the other part of the airflow induced a strong backflow in the cutting position.Therefore,there were two lateral impacts on the train.For the head car with the OST,the drop ratios of the peak-to-peak values compared with RWT were 47%,40%,and 52%for the side force coefficient C_(Fy),lift force coefficient C_(Fz) and overturning moment coefficient C_(Mx),respectively.For the peak-to-peak value of the dynamic parameters,the drop ratios of OST compared with RWT were all larger than 50%.The maximum dynamic overturning coefficients for RWT and OST were 0.75 and 0.3,respectively.本文研究了大风环境下从平地至路堑的直角挡风墙过渡区域对列车空气动力学和系统动力学响应的影响,提出一种斜切过渡缓解措施来减小原始挡风墙过渡对列车气动和动力学性能的影响。结果表明,由于直角挡风墙过渡的影响,来流风场在线路内被分为两部分,一部分在平地位置引起强烈回流,另一部分在路堑位置引起强烈回流。因此,列车经过挡风墙过渡区域时受到了两次横向冲击。采用挡风墙斜切过渡后,头车侧向力系数、升力系数和倾覆力矩系数与原始挡风墙过渡相比,峰峰值分别下降了47%、40%和52%。对于车辆系统动力学响应参数的峰峰值,挡风墙斜切过渡相比原始过渡降幅均超过50%,其中原始挡风墙过渡和缓解措施下的列车动力学倾覆系数分别为0.75和0.3。

关 键 词：high-speed train windbreak wall CROSSWIND CFD train aerodynamics vehicle system dynamics 

分 类 号：U213.12[交通运输工程—道路与铁道工程]