Aerodynamic performance analysis of trains on slope topography under crosswinds  

作　　者：LIU Tang-hong 刘堂红;苏新超;张洁;陈争卫;周细赛(Key Laboratory of Traffic Safety on Track of Ministry of Education （Central South University）, Changsha 410075, China School of Traffic ＆ Transportation Engineering, Central South University, Changsha 410075, China)

机构地区：[1]Key Laboratory of Traffic Safety on Track of Ministry of Education (Central South University), Changsha 410075, China [2]School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China

出　　处：《Journal of Central South University》2016年第9期2419-2428,共10页中南大学学报（英文版）

基　　金：Projects(U1334205,U1134203)supported by the National Natural Science Foundation of China;Project(132014)supported by the Fok Ying Tong Education Foundation,China;Projects(2014T001-A,2015T002-A,2015J007-N)supported by China Railways Corporation

摘　　要：This work used the computational fluid dynamics method combined with full-scale train tests to analyze the train aerodynamic performance on special slope topography. Results show that with the increment in the slope gradient, the aerodynamic forces and moment increase sharply. Compared with the flat ground condition, the lateral force, lift force, and overturning moment of the train on the first line increase by 153.2%, 53.4% and 124.7%, respectively, under the slope gradient of 20°. However, with the increment of the windward side's depth, the windbreak effect is improved obviously. When the depth is equal to 10 m, compared with the 0 m, the lateral force, lift force and overturning moment of the train on the first line decrease by 70.9%, 77.0% and 70.6%,respectively. Through analyzing the influence of slope parameters on the aerodynamic performance of the train, the relationships among them are established. All these will provide a basic reference for enhancing train aerodynamic performances under different slope conditions and achieve reasonable train speeds for the operation safety in different wind environments.This work used the computational fluid dynamics method combined with full-scale train tests to analyze the train aerodynamic performance on special slope topography. Results show that with the increment in the slope gradient, the aerodynamic forces and moment increase sharply. Compared with the flat ground condition, the lateral force, lift force, and overturning moment of the train on the first line increase by 153.2%, 53.4% and 124.7%, respectively, under the slope gradient of 20°. However, with the increment of the windward side’s depth, the windbreak effect is improved obviously. When the depth is equal to 10 m, compared with the 0 m, the lateral force, lift force and overturning moment of the train on the first line decrease by 70.9%, 77.0% and 70.6%, respectively. Through analyzing the influence of slope parameters on the aerodynamic performance of the train, the relationships among them are established. All these will provide a basic reference for enhancing train aerodynamic performances under different slope conditions and achieve reasonable train speeds for the operation safety in different wind environments.

关 键 词：TRAIN WIND slope topography aerodynamic performance 

分 类 号：U270.11[机械工程—车辆工程]