准流线型动车组列车头型优化设计与气动性能分析

Optimization Design of Quasi-Streamlined EMU Head Shape and Aerodynamic Performance Analysis

在分析准流线型动车组列车头部外形特点的基础上,对其进行了改型优化设计,措施包括加大列车细长比以及改变外部形状等.应用CATIA软件通过创建列车头部曲面的主型线、中间控制线等步骤,完成了列车流线型头部的三维曲面模型设计,同时应用曲线曲率梳工具,通过调整控制点的位置,完成了控制线的位置调整.流线型列车头部曲面的静态光顺性评价表明被测区域达到了曲面光顺的要求.应用CFD技术,采用三辆编组形式,模拟计算了两种列车在6种不同速度时的空气阻力.结果表明:与准流线列车相比,流线型列车在降低列车运行空气阻力方面效果明显.

In view of the structural features of head outer shape of quasi-streamlined EMU, it is redesigned by some improved measures including increasing the s[enderness ratio and changing the outer shape. The streamlined head shape model is completed by creating main lines and middle control lines by using CATIA software, meanwhile the shape of control lines is optimized by adjusting the position of the control points with the help of curve curvature comb tool. The static smoothness evaluation of streamlined head shape show that the measured region has reached the surface smoothing requirements. CFD method is used to calculate the air resistance of the two types of trains under 3-compartment formation at six different velocities, the results show that the streamlined train has a better performance in reducing air resistance compared with the quasi-streamlined train.