On the effect of rail-end slope in train aerodynamics under crosswind. Issue 6 (3rd June 2022)

• Record Type: Journal Article
• Authors: Li, Li; Liu, Tanghong; Guo, Zijian; Li, Wenhui; Xia, Yutao
• Is Part Of: Vehicle system dynamics. Volume 60:Issue 6(2022)
• Page Start: 1888
• Page End: 1908
• Publication Date: 2022-06-03
• Subjects: High-speed train -- crosswind -- rail-end slope -- aerodynamics -- CFD; Motor vehicles -- Dynamics -- Periodicals; Electronic journals; 629.231
• DOI: 10.1080/00423114.2021.1883067
• Languages: English
• ISSNs: 0042-3114

Abstract

Abstract : 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.