Influence of the Topological Structures of the Nose of High-Speed Maglev Train on Aerodynamic Performances

Yeteng Wang, Zhenxu Sun
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引用次数: 1

Abstract

In the past few years, considerable attention has been paid to high-speed maglev train in the field of rail transit. The design speed of the high-speed maglev train is 600km/h, which is significantly higher than that of the high-speed train. With the increase in operating speed, high-speed maglev trains have higher requirements for aerodynamic shape. Superior performance, the beautiful aerodynamic shape is an important direction for the development of high-speed maglev trains. Based on the Vehicle Modeling Function (VMF) method, the current research has developed a parametric shape design method suitable for the aerodynamic shape of the maglev train’s nose. This method can obtain different topological structures of the high-speed maglev train’s nose. The current research uses this method to generate four maglev train noses with large appearance differences and uses these train noses to construct four simplified high-speed maglev models. Then this study numerically analyzes the flow fields of different train models and compares the differences in aerodynamic performance including aerodynamic drag, aerodynamic lift and wake characteristics. The Q-criterion is used to study the vortex structure and mechanism of different train wake regions, and the vortex propagation process is studied by turbulence kinetic energy (TKE). Studying the difference in the aerodynamic force of different topological shapes will help to improve the aerodynamic performance of high-speed maglev trains.
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高速磁浮列车机头拓扑结构对气动性能的影响
近年来,高速磁悬浮列车在轨道交通领域受到了相当大的关注。高速磁悬浮列车的设计速度为600km/h,明显高于高速列车。随着运行速度的提高,高速磁悬浮列车对气动外形的要求也越来越高。优越的性能、美观的气动外形是高速磁悬浮列车发展的重要方向。基于车辆建模函数(Vehicle Modeling Function, VMF)方法,提出了一种适合磁悬浮列车机头气动外形的参数化设计方法。该方法可以获得高速磁悬浮列车机头的不同拓扑结构。本研究利用该方法生成了4个外观差异较大的磁浮列车车头,并利用这些车头构建了4个简化的高速磁浮模型。然后对不同型号列车的流场进行数值分析,比较其气动性能的差异,包括气动阻力、气动升力和尾迹特性。采用q准则研究了列车尾流不同区域的涡结构和机制,并利用湍流动能(TKE)研究了涡的传播过程。研究不同拓扑形状下的气动力差异,有助于提高高速磁悬浮列车的气动性能。
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