Aerodynamic drag analysis of double-deck container vehicles with different structures  

作　　者：李燕飞 田红旗 杨明智 

机构地区：[1]Key Laboratory of Traffic Safety on Track,Ministry of Education,Central South University [2]School of Traffic and Transportation Engineering,Central South University

出　　处：《Journal of Central South University》2011年第4期1311-1315,共5页中南大学学报（英文版）

基　　金：Project(50975289) supported by the National Natural Science Foundation of China;Project(2009J007-C) supported by the Technological Research and Development Program of the Ministry of Railways,China;Project(CX2010B122) supported by Hunan Provincial Innovation Foundation for Postgraduate Students,China

摘　　要：To study the aerodynamic performance of a new six-axis X2K double-deck container vehicle, numerical simulation was done based on three-dimensional, steady Navier-Stokes equations and k-e turbulence model. The results show that the pressure on the front surface of vehicle is positive, and others are negative. The maximum negative one appears as a ＂gate＂ shape on front surfaces. The pressure on vehicle increases with train speed, and pressure on vehicles with cross-loaded structure is smaller than that without it. The airflow around vehicles is symmetrical about train vertical axis, and the flow velocity decreases gradually along the axis to ground. Airflow around vehicles with cross-loaded structure is weaker than that without the structure. The aerodynamic drag increases linearly with the train speed, and it is minimum for the mid-vehicle. The linear coefficient for mid-vehicle without cross-loaded structure is 29.75, nearly one time larger than that with the structure valued as 15.425. So, from the view-point of aerodynamic drag, the cross-loaded structure is more reasonable for the six-axis X2K double-deck container vehicle.To study the aerodynamic performance of a new six-axis X2K double-deck container vehicle,numerical simulation was done based on three-dimensional,steady Navier-Stokes equations and k-ε turbulence model.The results show that the pressure on the front surface of vehicle is positive,and others are negative.The maximum negative one appears as a "gate" shape on front surfaces.The pressure on vehicle increases with train speed,and pressure on vehicles with cross-loaded structure is smaller than that without it.The airflow around vehicles is symmetrical about train vertical axis,and the flow velocity decreases gradually along the axis to ground.Airflow around vehicles with cross-loaded structure is weaker than that without the structure.The aerodynamic drag increases linearly with the train speed,and it is minimum for the mid-vehicle.The linear coefficient for mid-vehicle without cross-loaded structure is 29.75,nearly one time larger than that with the structure valued as 15.425.So,from the view-point of aerodynamic drag,the cross-loaded structure is more reasonable for the six-axis X2K double-deck container vehicle.

关 键 词：six-axis X2K double-deck container vehicle loading form aerodynamic drag numerical simulation 

分 类 号：U469.62[机械工程—车辆工程] U461.1[交通运输工程—载运工具运用工程]