An improved delayed detached eddy simulation study of the bogie cavity length effects on the aerodynamic performance of a high-speed train
Artikel i vetenskaplig tidskrift, 2020

This paper uses an improved delayed detached eddy simulation method to investigate the unsteady flow features of the high-speed trains with various cavity lengths at Re = 1.85x10(6). The improved delayed detached eddy simulation results are validated against the experimental data obtained during previous wind tunnel tests. The effects of cavity length on the resistance force, flow structures beneath the high-speed train and in the wake are analyzed. The results show that a longer cavity significantly increases the streamwise velocity level near the rear plates and forms a stronger impinging flow on the rear plates, and thus contributes to a higher value of resistance. Furthermore, a longer cavity decreases the pressure coefficients around the near wake region from the top of the ballast to the tail nose in the vertical direction and thereby increases the pressure drag of the high-speed train. Additionally, a longer bogie cavity is found to increase the longitudinal vortex scales in the near wake region. All these changes on the flow field bring to 5.8% and 11.5% drag increase when the bogie cavities are elongated by 20% and 40%, respectively, of the wheelbase.

improved delayed detached eddy simulation

flow characteristics

bogie cavity length

high-speed train

Aerodynamic drag

Författare

Jiabin Wang

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Central South University

Guglielmo Minelli

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Yan Zhang

Central South University

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Jie Zhang

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Sinisa Krajnovic

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Guangjun Gao

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Central South University

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

0954-4062 (ISSN)

UNSP 0954406220907631

Ämneskategorier

Havs- och vattendragsteknik

Farkostteknik

Strömningsmekanik och akustik

DOI

10.1177/0954406220907631

Mer information

Senast uppdaterat

2020-12-04