A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of simplifying train bogies on surrounding flow and aerodynamic forces
In this study, the numerical solution of a high-speed train with several simplified bogies is investigated. The time-averaged flow field around the train, the surface pressure, and the aerodynamic forces on the train are discussed. The results reveal that a simpler bogie structure can achieve a higher underbody flow velocity and change fluctuations beneath the train owing to the resulting turbulence level. The simplification of bogies has a smaller effect on the side slipstream velocity and pressure compare to which in underbody, and at 3 m away from the centre of the track, the simplified bogie with wheels and a simple side frame used in this study obtains similar results to cases wherein more complex bogies are used. The surface pressure under the train is affected by bogie simplification, especially in the bogie cabin end area, resulting in aerodynamic drag and lift variations. If underbody flow or aerodynamic drag and lift forces are the focus of study, then the geometry of the centre region of the bogie, i.e. its main structures features, should be maintained in simplified models.
Highlights The unsteady aerodynamic performance of high-speed train was investigated with various bogie geometries. The time-averaged flow fields and aerodynamic forces were analysed. With simpler bogie structure, higher underbody flow velocity can be achieved. At 3 m away from the centre of track, the effect of bogie structure is small. The time-averaged aerodynamic force coefficients changed with simplifying bogie geometry.
Abstract.
Effects of simplifying train bogies on surrounding flow and aerodynamic forces
In this study, the numerical solution of a high-speed train with several simplified bogies is investigated. The time-averaged flow field around the train, the surface pressure, and the aerodynamic forces on the train are discussed. The results reveal that a simpler bogie structure can achieve a higher underbody flow velocity and change fluctuations beneath the train owing to the resulting turbulence level. The simplification of bogies has a smaller effect on the side slipstream velocity and pressure compare to which in underbody, and at 3 m away from the centre of the track, the simplified bogie with wheels and a simple side frame used in this study obtains similar results to cases wherein more complex bogies are used. The surface pressure under the train is affected by bogie simplification, especially in the bogie cabin end area, resulting in aerodynamic drag and lift variations. If underbody flow or aerodynamic drag and lift forces are the focus of study, then the geometry of the centre region of the bogie, i.e. its main structures features, should be maintained in simplified models.
Highlights The unsteady aerodynamic performance of high-speed train was investigated with various bogie geometries. The time-averaged flow fields and aerodynamic forces were analysed. With simpler bogie structure, higher underbody flow velocity can be achieved. At 3 m away from the centre of track, the effect of bogie structure is small. The time-averaged aerodynamic force coefficients changed with simplifying bogie geometry.
Abstract.
Effects of simplifying train bogies on surrounding flow and aerodynamic forces
Dong, Tianyun (author) / Liang, Xifeng (author) / Krajnović, Sinisa (author) / Xiong, Xiaohui (author) / Zhou, Wei (author)
Journal of Wind Engineering and Industrial Aerodynamics ; 191 ; 170-182
2019-06-11
13 pages
Article (Journal)
Electronic Resource
English
IDDES , Simplification , Bogie , Train , Aerodynamics , Underbody flow
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