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A study on a partially-open bogie fairing to improve anti-snow performance of a high-speed train

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Abstract

The concept of a partially-open bogie fairing has been proposed to attenuate snow accretion on bogies as well as to reduce the aerodynamic drag for high-speed trains. Numerical simulations were performed on the EMU-320 model of Korea Train eXpress running at 320 km/h with changes in the bogie fairings using Reynolds-averaged Navier-Stokes simulations. The area of the positive pressure coefficient inside the bogie region increased as the open area became smaller. The incoming flow to the bogie region was concentrated at the front open area along the bogie regions, and the incoming streamlines did not go outside due to that the rear area was closed. They prevented a flow coming from under the train because they occupied the inside volume of the bogie region. The incoming flow from under the train was controlled to relieve the snow accretion inside the bogie regions by changing the front open area. This condition led to not only dissipated vortical structures at the bogie but also drag reduction comparable to that of the perfectly-closed bogie fairing.

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Abbreviations

AC :

All-closed

AO :

All-open

Cd :

Drag coefficient

C p :

Pressure coefficient

EMU :

Electric multiple unit

e :

Specific internal energy

FO :

Forward-open

HO :

Half-open

H :

Height of the train model with a value of 3.7 m

h :

Distance between the top of the rail and the bottom surface of the train

k :

Turbulent kinetic energy

k eff :

Effective thermal conductivity

KTX :

Korea Train eXpress

M :

Mach number

ṁ :

Mass flow rate

μ :

Dynamic viscosity of fluid

μ eff :

Effective dynamic viscosity

v :

Kinematic viscosity of fluid

ω :

Turbulent dissipation rate

p :

Pressure

ρ :

Density of fluid

SST:

Shear stress transport

t :

Time

u T :

Friction velocity

u i :

Velocity components according to the directions in the cartesian coordinate

X i :

Directions in the cartesian coordinate

y w :

Wall-normal distance at the first layer

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Acknowledgments

This work was supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant 22RTRP-B146024-05).

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Author notes

  1. These authors equally contributed to the present work.

Authors and Affiliations

  1. Department of Transportation System Engineering, Korea National University of Transportation, 157 Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16106, Korea

    Beomsu Kim & Hyeokbin Kwon

  2. Department of Railway Vehicle System Engineering, Korea National University of Transportation, 157 Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16106, Korea

    Junsun Ahn

Authors
  1. Beomsu Kim
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Corresponding author

Correspondence to Hyeokbin Kwon.

Additional information

Beomsu Kim is a master degree candidate of the Department of Transportation System Engineering, Korea National University of Transportation, Uiwang, Gyeonggi-do, Korea. His research interests include railway aerodynamics and future transportation system design.

Junsun Ahn is an Assistant Professor of the Department of Railway Vehicle System Engineering, Korea National University of Transportation, Uiwang, Gyeonggido, Korea. He received his Ph.D. in Mechanical Engineering from KAIST. His research interests include turbulence, flow control and railway aerodynamics.

Hyeokbin Kwon is a Professor of the Department of Transportation System Engineering, Korea National University of Transportation, Uiwang, Gyeonggi-do, Korea. He received his Ph.D. in Aerospace Engineering from Seoul National University. His research interests include railway aerodynamics and future transportation system design.

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Kim, B., Ahn, J. & Kwon, H. A study on a partially-open bogie fairing to improve anti-snow performance of a high-speed train. J Mech Sci Technol 37, 1859–1869 (2023). https://doi.org/10.1007/s12206-023-0324-x

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  • DOI: https://doi.org/10.1007/s12206-023-0324-x

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