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Numerical analysis of aerodynamic characteristics of high-speed train with different train nose lengths

Niu, Jiqiang ; Wang, Yueming ; Zhang, Lei ; Yuan, Yanping

International journal of heat and mass transfer, 2018-12, Vol.127, p.188-199 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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Título:
Numerical analysis of aerodynamic characteristics of high-speed train with different train nose lengths
Autor: Niu, Jiqiang ; Wang, Yueming ; Zhang, Lei ; Yuan, Yanping
Assuntos: Aerodynamic characteristics ; Aerodynamic drag ; Aerodynamic performance ; Aerodynamics ; Boundary layer ; Boundary layer thickness ; Computational fluid dynamics ; Computer simulation ; Flow structure ; High speed rail ; High-speed train ; Mathematical models ; Nose ; Numerical analysis ; Pressure distribution ; Railroad cars ; Simulation ; Stress concentration ; Train nose length ; Trains ; Variation ; Velocity ; Velocity distribution ; Wind effects ; Wind tunnel testing ; Wind tunnels
É parte de: International journal of heat and mass transfer, 2018-12, Vol.127, p.188-199
Descrição: •IDDES method was used to simulate the train unsteady aerodynamic performance.•The effect of streamline length on drag of tail car and lift force of head car is stronger than others.•The vortex drag is major of the drag of the tail car and mainly depends on the train streamline length.•Increasing the streamline length decreases the force fluctuation, especially the head car. In this study, based on the SST κ-ω turbulent model, the IDDES method is used to simulate the unsteady aerodynamic performance of trains with respect to different lengths of the tapered nose of the train (8 m and 12 m). The numerical simulation used in this study is verified through wind tunnel tests. The effects of the length of the tapered nose of the train on the aerodynamic performance, such as the train forces, boundary layer, velocity distribution, pressure distribution, and flow structure around the train, are elucidated via comparing and analyzing the obtained results. The results indicate that the effect of the length of the tapered nose of the train on the drag force of the tail car and lift force of the head car is stronger than the effect on other cars, and the Cd value of the tail car decreases by 30.53% and the Cl value of the head car increases by 87.98%. Increase in the length of the tapered nose of the train decreases the fluctuation of the drag and lift forces of the train, especially the head car. It is also observed that the boundary layer thickness around the train is decreased with the increase in the length of the tapered nose of the train. Moreover, it is observed that vortex drag is the primary factor in the aerodynamic drag of the tail car and that vortex drag primarily depends on the length of the tapered nose of the train.
Editor: Oxford: Elsevier Ltd
Idioma: Inglês

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Numerical analysis of aerodynamic characteristics of high-speed train with different train nose lengths

Niu, Jiqiang ; Wang, Yueming ; Zhang, Lei ; Yuan, Yanping

Oxford: Elsevier Ltd

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