Analysis of Water Film Distribution and Aerodynamic Performances of High-Speed Train Under Rainfall Environment

作者：Meixiang Li, Mengge Yu, Jiali Liu, Xugao Sheng · 发表于：Chinese Journal of Mechanical Engineering · 年份：2024 · DOI：10.1186/s10033-024-01120-7 · 被引用次数：5 · 研究领域：Aerodynamics and Fluid Dynamics Research、Aerosol Filtration and Electrostatic Precipitation、Vehicle emissions and performance

Abstract The current research on the aerodynamic performance of the train running in rainy weather is primarily concerned with the trajectory of the raindrops and the aerodynamic variation of trains caused by raindrops. In fact, water film will generate on the train body when raindrops hit the train, which interacts with the flow field around the train, and would probably affect the aerodynamic performance of the train. In this paper, based on shear stress transport (SST) k-w turbulence model and Euler-Lagrange discrete phase model, the aerodynamic calculation model of a high-speed train under rainfall environment is established. The LWF (Lagrangian wall film) is used to simulate the water film distribution of the high-speed train under different rainfall intensities, and the aerodynamic performance of the train are studied. The calculation results show that raindrops will gather on the train surface and form water film under rainfall environment. With the extension of rainfall time, the thickness and coverage range of water film expand, and the maximum thickness of water film can reach 4.95 mm under the working conditions in this paper. The average thickness of water film on the train body increases with the rainfall intensity. When the rainfall intensity increases from 100 mm/h to 500 mm/h, the average water film thickness will increase by 3.26 times. The velocity of water film in the streamlined area of head car is larger than that in other areas, and the maximum velocity ...