突变阶跃型阵风作用下高速列车的气动特性分析  

Aerodynamic Characteristic Analysis of High-Speed Train under Gust with Mutation Step

作　　者：李泉[1] 杜礼明[1] 

机构地区：[1]大连交通大学机械工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2016年第3期27-31,共5页Journal of Dalian Jiaotong University

基　　金：牵引动力国家重点实验室开放基金资助项目(TPL0906)

摘　　要：为研究阵风对高速列车行车安全的影响,建立了突变阶跃型阵风作用下高速列车的三维数值模型,分析了突变阶跃型阵风对高速列车的气动性能影响规律,并与恒定风场下的情况进行了对比.结果表明,与恒定风速相比,阵风对高速列车所受的各种气动力影响明显,且不同的阵风模型有不同的影响;阵风发生突变时列车表面的气动力成倍增加,阵风结束后其尾流对高速列车仍有作用;尾流对高速列车的气动力随阵风风速增大而变大,尾流的作用时间也随之增长,最高风速为5 m/s的阵风,尾流在10 s左右后消失;而对于最高风速为30 m/s的阵风,其尾流在14.2 s左右后才消失.In order to explore the impacts of gusts on traffic safety of high-speed trains,a three-dimensional aerodynamic numerical model of high-speed trains running in gust with mutation step was developed. The impacts of the mutation step gust on aerodynamic performance of the high-speed trains were analyzed and compared with the cases under the constant speed wind. The results show that the gusts have obvious impacts on various aerodynamic forces of the high-speed trains,and different gust model has different impacts,compared with the impacts of constant speed wind. It also indicates that aerodynamic force on the train surface are increased by times. When gusts mutating,the tail wake of gust still play some role on the train. The aerodynamic forces on high-speed trains and the action time of the gust wake increase with gusts speed increasing. For example,the gust wake lasts about 10 s after the gust with the maximum speed of 5 m / s disappearing and 14. 2 s for the gust with the maximum speed of 30 m / s.

关 键 词：突变阶跃型阵风 高速列车 气动特性 数值分析 

分 类 号：U270.11[机械工程—车辆工程]