横风下路堤高度对高速列车气动特性影响  

Influence of embankment height on aerodynamic performance of high-speed trains under crosswind

作　　者：苗秀娟[1] 黄瑞鹏 何侃 祝百年 孔繁冰 MIAO Xiujuan;HUANG Ruipeng;HE Kan;ZHU Bainian;KONG Fanbing(College of Automobile and Machinery Engineering,Changsha University of Science and Technology,Changsha 410076,China;Key Laboratory of Traffic Safety on the Track of Ministry of Education,Central South University,Changsha 410076,China;Technical Research Center,CRRC Tangshan Co.,Ltd.,Tangshan 064000,China)

机构地区：[1]长沙理工大学汽车与机械工程学院,湖南长沙410076 [2]中南大学轨道交通安全教育部重点实验室,湖南长沙410075 [3]中车唐山机车车辆有限公司技术研究中心,河北唐山064000

出　　处：《铁道科学与工程学报》2021年第5期1081-1089,共9页Journal of Railway Science and Engineering

基　　金：国家重点研发计划资助项目(2017YFB1201304);国家自然科学基金青年基金资助项目(51605044)。

摘　　要：通过采用三维瞬态DDES数值方法模拟强横风下,在路堤上运行的高速列车周围流场,对比3,6,9和12 m 4种路堤高度对高速列车瞬态气动性能的影响。研究结果表明:强横风下,随着路堤高度的增加,列车两侧压力差增大,并影响列车周围流速分布,使得流场情况更为复杂。瞬态流场结构显示,在路堤高度增加之后,车体背风侧的涡结构逐渐由体积较小、脉动频率较高、能量较小的分离状逐渐转变为融合度更高、体积更大、脉动频率较低、能量较大的涡结构,将会使得车体运动的稳定性受到更大影响,更容易发生倾覆危险。从气动力来看,随着路堤高度的增加,头车受到的气动载荷增加较大。The three-dimensional transient DDES numerical method was used to simulate the flow field around high-speed trains running on embankments under strong crosswind.The effects of four embankments which are at the height of 3,6,9 and 12 m on the transient aerodynamic performance of a high-speed train were compared.The simulation results are as follows.Under strong crosswind,the increase of embankment height leads to the increase of pressure difference on both sides of the train,and affects the velocity distribution around the train,making the flow field more complex.The transient flow field structure shows that after the embankment height increases,the vortex structure on the leeward side of the train body gradually changes from a small volume,a high pulsating frequency and a small energy separation to a vortex structure with a higher fusion degree,a larger volume,a lower pulsating frequency and a larger energy,which will make the stability of the train more affected and more prone to overturning.The increase of embankment height also has a greater impact on the aerodynamic forces of the head car.

关 键 词：高速列车 横风 路堤高度 数值模拟 DDES 

分 类 号：U270[机械工程—车辆工程]