Investigation of bogie positions on the aerodynamic drag and near wake structure of a high-speed train

Gao, Guangjun; Feng, Li-Hao; He, Kan; Wang, Jiabin; Zhang, Jie; Miao, Xiujuan

doi:10.1016/j.jweia.2018.10.012

Cited by 53 publications

(21 citation statements)

References 15 publications

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“…36–38 The semi-implicit method for pressure-linked equations-consistent (SIMPLEC) was selected to deal with pressure–velocity coupling. 23,39,40 A dual time-stepping format with second-order accuracy was used for time discretization. For each time step, the number of iterations is no less than 30, the residual of each equation are no more than 10 −4 , and the time step is 1.0 × 10 −4 s, the corresponding CFL number is less than 1.0 in more than 99% cells.…”

Section: Methodsmentioning

confidence: 99%

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Niu

Wang

Liu

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Sand and gravel blown up by strong wind will cause damage to windows. Following up, it will cause the change in the flow field around a train immediately, which has a significant impact on the aerodynamic performance of the train. Delayed detached-eddy simulation based on the shear stress transport κ-ω turbulence model was used to investigate the aerodynamic characteristics of passenger vehicles under crosswind, and the effect of damaged windows on the train aerodynamic performance and flow field around the train was analyzed and compared. The grid generation and numerical method are verified in the previous studies. Results show that the aerodynamic performance of a passenger vehicle is significantly affected by damaged windows on both sides of the passenger vehicle, both the aerodynamic lateral force and overturning moment of the passenger vehicle were decreased, and this has a small effect on the aerodynamic performance of the downstream passenger vehicle. Fluctuation of the aerodynamic lift, lateral force, and overturning moment of a vehicle with damaged windows on both sides of the vehicle is significantly increased. Damaged windows do not change the existence of the main vortices around vehicles, but the size, location, and strength of the main vortices are obviously changed, especially when windows on both sides of the vehicle are damaged. Therefore, when windows on the windward side of the vehicles are damaged, opening or broking windows on the leeward side of the vehicles will help reduce the risk of vehicles overturning and derailment.

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Section: Methodsmentioning

confidence: 99%

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Niu

Wang

Liu

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The semi-implicit method for pressure-linked equations-consistent algorithm was used to process the pressure-velocity coupling to accelerate convergence, [37][38][39] which has been widely used in simulations of train aerodynamic performance. [40][41][42][43] Bounded central differencing and second-order upwind schemes were used to deal with the momentum and j-x equations, respectively. The dual-time step format was employed to process the time discretisation, where the time step was 1.0 Â 10 À5 s, and the largest physical time step was Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Aerodynamic behavior of a high-speed train with a braking plate mounted in the region of inter-car gap or uniform-car body: A comparative numerical study

Niu

Wang

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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The continuous increase in train speed has brought serious challenges to train braking safety. Aerodynamic braking technology can effectively improve the braking effect of trains at high speeds. In this study, an aerodynamic braking device installed in the inter-car gap region (ICG) of a high-speed train is proposed and the aerodynamic performance of the high-speed train with an aerodynamic braking device is assessed by improved delayed detached eddy simulation (IDDES) based on the κ-ω turbulence model. The results show that the opening of the plate significantly changes the aerodynamic performance of the train, thereby greatly increasing the aerodynamic forces of the train and their fluctuation degree. The effect of the opening of the plate increases the turbulence of the downstream flow field around the tail car. The affected area is mainly concentrated in the flow field around the location of the plate for the pressure field and the whole flow field behind the plate for the velocity field. The effect of the plate mounted on the uniform-car body region (UCG) on increasing the aerodynamic drag is better than that at the ICG, though the aerodynamic fluctuation and the influence on the surrounding flow field will also be great.

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“…In the present paper, the train model with three carriages will be considered, to greatly reduce the computational cost. Compared to other components, the bogies own more complicated shape and affect greatly on the flow around the train, especially the flow underneath the train body (Gao et al, 2019;Wang et al, 2018aWang et al, , 2018b. As a result, the influence of bogies on the slipstream is mainly discussed in this section, to determine a better way for the simplification of bogies.…”

Section: Simplification Of the Train Modelmentioning

confidence: 99%

Research on aerodynamic optimization of high-speed train’s slipstream

Sun

Yao

Yang

2020

Engineering Applications of Computational Fluid Mechanics

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Slipstream severely affects the safety of trackside workers and equipment. With use of profile superimposition method and vehicle modeling method, parametrization of the whole train is carried out. Then, a slipstream optimization study has been performed, taking components of slipstream in different directions at the standard heights, the drag coefficient of the whole train and the volume of the driving cab as the design objectives. For each design objective, one unique ε-TSVR surrogate model has been constructed. Six final Pareto sets have been obtained on the base of six groups of different fitness functions by using multi-objective particle swarm method. Results reveal that the volume of the driving cab keeps almost the same, compared to the original shape. The velocity components of train-induced wind at the positions 0.2 and 1.4 m above the top of the rail, and the drag coefficient of the train are reduced by 11.6%, 33.9%, 24.7%, 25.9% and 13.0% respectively. Sensitivity analysis reveals that the length of the streamline, the height of the train and the width of the train influence significantly on the aerodynamic performance, and the train with a tall and thin streamline will benefit in reducing the slipstream and aerodynamic drag.

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Investigation of bogie positions on the aerodynamic drag and near wake structure of a high-speed train

Cited by 53 publications

References 15 publications

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Numerical study on the effect of damaged windows on aerodynamic characteristics of passenger trains under strong crosswind

Aerodynamic behavior of a high-speed train with a braking plate mounted in the region of inter-car gap or uniform-car body: A comparative numerical study

Research on aerodynamic optimization of high-speed train’s slipstream

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