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On the effect of rail-end slope in train aerodynamics under crosswind
Vehicle System Dynamics ( IF 3.6 ) Pub Date : 2021-02-08 , DOI: 10.1080/00423114.2021.1883067
Li Li 1, 2, 3 , Tanghong Liu 1, 2, 3 , Zijian Guo 1, 2, 3 , Wenhui Li 1, 2, 3 , Yutao Xia 1, 2, 3
Affiliation  

Railway track models with sloped subgrade ends, are commonly used in studies of train. In the present work, the effect of subgrade-end slope under a yaw angle of 30° was investigated by delayed detached eddy simulation (DDES) using one-eighth-scale train and single-track rail models. The obtained results were validated with wind tunnel tests. Time-averaged aerodynamic coefficients, pressure distribution, and flow field around the train were analysed and compared in three cases with different subgrade-end slopes. The results show that, the lift force of three cars is reduced with increasing subgrade-end slope, while the side force is found to be increased with increasing slope; the overturning moment of head and middle car decrease but which of tail increase. The extreme values occur in the case of 60°. Furthermore, the subgrade-end slope gives a variable impact on pressure distribution and flow pattern in different regions. This work has guiding significance for the selection of rail models in the subsequent train aerodynamic studies.



中文翻译:

侧风作用下轨端坡度对列车空气动力学的影响

具有倾斜路基端部的铁路轨道模型常用于列车研究。在目前的工作中,使用八分之一比例的火车和单轨模型,通过延迟分离涡模拟(DDES)研究了30°偏航角下路基端边坡的影响。所得结果通过风洞试验进行了验证。对三种不同路基端坡情况下的时均气动力系数、压力分布和列车周围流场进行了分析和比较。结果表明,三辆车的提升力随着路基端坡的增加而减小,而侧向力随着坡度的增加而增加;头车和中车倾覆力矩减小,尾车倾覆力矩增大。极值出现在 60° 的情况下。此外,路基端坡对不同区域的压力分布和流型产生不同的影响。该工作对后续列车气动研究中钢轨模型的选择具有指导意义。

更新日期:2021-02-08
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