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Flow between the train underbody and trackbed around the bogie area and its impact on ballast flight

Flow between the train underbody and trackbed around the bogie area and its impact on ballast flight
Flow between the train underbody and trackbed around the bogie area and its impact on ballast flight
The aerodynamic behaviour of flow past a simplified high-speed train bogie including the ground underneath with ballast particles at scale 1:10 is studied numerically. It is found that the flow around the bogie is highly unsteady due to strong flow separations and flow interactions developed there. Generally, the ballast particles distributed inside the wheels are situated in the stronger turbulent flow and are subject to much higher aerodynamic forces than the particles located outside the wheels. Moreover, these aerodynamic forces increase when the ballast particles are located downstream of the bogie cavity and reach the peak values close to the bogie cavity trailing edge. Force time-series are produced based on the simulations of an array of the ballast particles in a wind-tunnel setup and it shows that the ballast flight is apt to happen as the rear part of the bogie cavity passing the ballast bed. When the ballast particles become airborne, the fluctuating forces generated increase significantly. Therefore, the stronger unsteady flow developed around the bogie cavity, especially in the cavity trailing edge region, will produce larger fluctuating forces on the ballast particles, which will be more likely to cause ballast flights for high-speed railways.
aerodynamics, high-speed train, Ballast flight, Computational Fluid Dynamics
0167-6105
20-28
Zhu, Jianyue
bde9cd8b-e917-4e15-beb6-e9251c1b9133
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Zhu, Jianyue
bde9cd8b-e917-4e15-beb6-e9251c1b9133
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65

Zhu, Jianyue and Hu, Zhiwei (2017) Flow between the train underbody and trackbed around the bogie area and its impact on ballast flight. Journal of Wind Engineering and Industrial Aerodynamics, 166, 20-28. (doi:10.1016/j.jweia.2017.03.009).

Record type: Article

Abstract

The aerodynamic behaviour of flow past a simplified high-speed train bogie including the ground underneath with ballast particles at scale 1:10 is studied numerically. It is found that the flow around the bogie is highly unsteady due to strong flow separations and flow interactions developed there. Generally, the ballast particles distributed inside the wheels are situated in the stronger turbulent flow and are subject to much higher aerodynamic forces than the particles located outside the wheels. Moreover, these aerodynamic forces increase when the ballast particles are located downstream of the bogie cavity and reach the peak values close to the bogie cavity trailing edge. Force time-series are produced based on the simulations of an array of the ballast particles in a wind-tunnel setup and it shows that the ballast flight is apt to happen as the rear part of the bogie cavity passing the ballast bed. When the ballast particles become airborne, the fluctuating forces generated increase significantly. Therefore, the stronger unsteady flow developed around the bogie cavity, especially in the cavity trailing edge region, will produce larger fluctuating forces on the ballast particles, which will be more likely to cause ballast flights for high-speed railways.

Text
Ballast Flight 2017 March accepted - Accepted Manuscript
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More information

Accepted/In Press date: 14 March 2017
e-pub ahead of print date: 3 April 2017
Published date: July 2017
Keywords: aerodynamics, high-speed train, Ballast flight, Computational Fluid Dynamics
Organisations: Aerodynamics & Flight Mechanics Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 406874
URI: http://eprints.soton.ac.uk/id/eprint/406874
ISSN: 0167-6105
PURE UUID: cddbf6b9-ff70-4ed1-8576-66297bf2a22b

Catalogue record

Date deposited: 25 Mar 2017 02:03
Last modified: 07 Oct 2020 06:20

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