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

Abstract：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. 作者： Author： LI Yan-fei  TIAN Hong-qi  YANG Ming-zhi 作者單位： Key Laboratory of Traffic Safety on Track, Ministry of Education, Central South University,Changsha 410075, China;School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China 期 刊： 中南大學學報(英文版)   EISCI Journal： Journal of Central South University of Technology(English Edition) 年，卷(期)： 2011, 18(4) 分類號： U469.62 U461.1 Keywords： six-axis X2K double-deck container vehicle    loading form    aerodynamic drag    numerical simulation    機標分類號： S56 F23 機標關鍵詞： structures    different    aerodynamic performance    negative    vertical axis    Navier-Stokes    flow velocity    decreases    positive    results    study    based    time    new 基金項目： the National Natural Science Foundation of China，the Technological Research and Development Program of the Ministry of Railways,China，Hunan Provincial Innovation Foundation for Postgraduate Students,China

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