铁道科学与工程学报Issue(5)：64-69,6.
基于DE S的高速列车气动阻力分布特性研究
Study on distribution characteristics of aerodyna mic drag of high-speed train based on DES
摘要
Abstract
The paper studies the contribution value of head,middle and tail regions of a high -speed train for aerodynamic drag coefficient of the whole train using DES method based on Realizable k-εequation.Combined with the results of wind tunnel test to verify the methods used in this paper,it can be found that the results ob-tained with DES method is in good agreement with wind tunnel test,both within 2% error.The time -history curve of transient aerodynamic drag coefficient of each car fluctuates around rms value,and the fluctuation mag-nitude of head car is the smallest but it is the biggest in the tail car.The aerodynamic drag of head surface area of the front and tail car and the bogie region of each car accounts for 77.8%of the whole train.From the head car,to middle car,to tail car,the aerodynamic drag coefficient of the front region of bogie reduces significantly, and the aerodynamic drag coefficient of the rear region of bogie increases gradually.From the perspective of the flow field structure,a lot of vortexes are generated in the head of the train,junction of two cars,the bottom of the car and the tail of the train.Along the length direction of the train,the vortexes near the head car body are smaller than the ones near the middle car and tail car.关键词
高速列车/气动阻力/分布特性/数值模拟Key words
high-speed train/aerodynamic drag/distribution characteristics/numerical simulation分类
交通工程引用本文复制引用
蔡军爽,张洁,刘堂红..基于DE S的高速列车气动阻力分布特性研究[J].铁道科学与工程学报,2014,(5):64-69,6.基金项目
国家自然科学基金资助项目 （）
