The influence of the leading-edge angle of subgrade on the aerodynamic loads of a high-speed train in a wind tunnel  

作　　者：Zeyun Yang Gang Xu Fan Wu Lei Zhang Jian Du Dmitri Vainchtein 

机构地区：[1]Key Labor atory of Traffic Safety on Track,Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,Hunan,China [2]CRRC Academy(Qingdao)Co.,Ltd.,Qingdao 266111,Shandong,China [3]CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,Shandong,China [4]Nyheim Plasma Institute,Drexel University,Camden 08103,USA

出　　处：《Transportation Safety and Environment》2024年第2期45-54,共10页交通安全与环境（英文）

基　　金：support of the National Natural Science Foundation of China(Grants No.52072413 and 52002408);the Project of State Key Labora-tory of High Performance Complex Manufacturing(Grant No.ZZYJKT2021-09);the Natural Science Foundation of Hunan Pr ovince(Grant No.2021JJ40772).

摘　　要：The purpose of this study is to establish the correlation between the boundary layer over the subgrade and the aerodynamic loads act-ing on the train model in conventional wind tunnel tests.Firstly,flow characteristics around the subgrade with different leading-edge angles(15°,30°and 45°)are investigated through the particle image velocimetry(PIV)experimental test method.Then,wind tunnel tests of the aerodynamic performance of a high-speed train are carried out.The results are compared with previous experimental data obtained by moving model tests.Results show that,due to the presence of a boundary layer,the pressure acting on the lower part of the train head decreases,while other locations are not significantly affected.This is the reason for the reduction of the aerodynamic drag and lift on the train.In addition,the reduction effects become more obvious when the thickness of the boundary layer increases.The experimental results obtained could serve as a calibration of aerodynamic forces for wind tunnel tests on high-speed trains.

关 键 词：high-speed train ground effect aerodynamic performance wind tunnel test PIV experiment 

分 类 号：U451.3[建筑科学—桥梁与隧道工程] U458[交通运输工程—道路与铁道工程] U298