Study on the effect of dimple position on drag reduction of high-speed maglev train  

作　　者：Dan Zhou Liliang Wu Changda Tan Tian’en Hu 

机构地区：[1]Key Laboratory of Traffic Safety on Track of the Ministry of Education,Central South University,Changsha 410075,China [2]Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Changsha 410075,China [3]National&Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle,Changsha 410075,China

出　　处：《Transportation Safety and Environment》2021年第4期125-138,共14页交通安全与环境（英文）

基　　金：supported by the National NumericalWind Tun-nel Project (Grant No.2018-ZT1A02);the Fundamental Research Funds for the Central Universities of Central South University (Grant No.2021zzts0682);the Fundamental Research Funds for the Central Universities of Central South University (Grant No.2019zzts266).

摘　　要：Transient numerical simulations were carried out by placing dimples at the top,sides and bottoms of the tail car streamline area of a high-speed maglev train.The results of an improved delayed detached eddy simulation turbulence model using three-dimensional compressible Navier-Stokes and shear-stress transport K-Omega double equations were compared to the results of a wind tunnel test to verify the numerical simulation accuracy,within 5%of the ground truth,which is an acceptable precision range.The results show that dimples arranged on the streamline area atop the train tail car affected the locations at which the airflow at the top and bottom of the train met and weakened the strength of the wake.The aerodynamic drag and lift coefficient decreased by 3.40%and 4.27%,respectively.When the dimples were arranged on the streamline area at the sides or bottoms of the train tail car,they had little effect on the top of the tail car,so they did not destroy the balance of the airflow at the top and bottom.They also had little influence on the development of wake topology.Therefore,the aerodynamic drag and lift of the train changed little.

关 键 词：aerodynamic drag DIMPLE flow structure high-speed maglev train 

分 类 号：O35[理学—流体力学]