Numerical study of the influence of dome shape on the unsteady aerodynamic performance of a high-speed train's pantograph subjected to crosswind  

作　　者：Xiaofang Li Dan Zhou Lirong Jia Mingzhi Yang 

机构地区：[1]Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic and Transportation Engineering,Central South University,Changsha 410075,China [2]Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China [3]National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Central South University,Changsha 410075,China [4]CSR Qingdao Sifang Co.Ltd.,Qingdao 266111,China

出　　处：《Journal of Traffic and Transportation Engineering(English Edition)》2023年第1期13-30,共18页交通运输工程学报（英文版）

基　　金：supported by the National Numerical Wind Tunnel Project(Grant No.NNW2018-ZT1A02);the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2019zzts266);the Key R&D Project in Sichuan Province(GrantNo.2019YFG0040).

摘　　要：This study aims to investigate the unsteady aerodynamic performance of a high-speed train’s pantograph with respect to two different dome shapes and without dome under a20°yaw angle using a delayed detached eddy simulation method.Further,the influence of the dome shape on the simulation results is determined.The accuracy of the numerical method was validated by comparing a few of the numerical results with the wind tunnel test results,and high consistency was observed.An analysis of aerodynamic forces and flow structures around the pantograph was performed.The dome had significant influence on velocity field distribution surrounding the pantograph,particularly in the wake of flow region.Compared with the case where the dome was absent,vortex intensity around the pantograph increased after installing the dome.The existence of the bathtub-type dome resulted in greater flow field disturbance and vortex strength than the baffle-type dome.Moreover,the dome considerably affected time-averaged aerodynamic coefficients and their fluctuations,especially the bathtub-type dome.Additionally,the power spectral density of the unsteady aerodynamic coefficient of each pantograph component exhibited significant peaks and typical broadband distribution characteristics.

关 键 词：High-speed train CROSSWIND PANTOGRAPH DOME Unsteady aerodynamic performance 

分 类 号：U270.11[机械工程—车辆工程]