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Numerical study of the effect of the tunnel hood on micro-pressure wave for increasing high-speed train operation speed

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Abstract

The effects of the tunnel hood on the micro-pressure wave were investigated by the numerical simulations of high-speed train with increasing the operating speed from 260 km/h to 400 km/h. Reduced 4 cars of the Korean Train eXpress (KTX) and the shortened tunnel along the Kyeongbu high-speed railway were used to focus on the entry compression wave and to sufficiently prevent the expansion wave reflected from the tunnel exit. As the operating speed increased, the intensity of the compression wave, compression wave gradient and micro-pressure wave increased regardless of the tunnel hood, but the magnitude was decreased due to the effects of the tunnel hood. However, although the tunnel hood was considered, the intensity of the micro-pressure wave for the speed of 400 km/h exceeded the regulation of South Korea. It was found that the micro-pressure wave can be mitigated by decreasing the slant angle of the tunnel hood.

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Abbreviations

A Tun, ref :

Reference cross-sectional are of the tunnel

A Tun :

Effective cross-sectional area of the tunnel

A Hood :

Cross-sectional area of the tunnel hood

β :

Hood slant angle

C d :

Drag coefficient

ΔP N :

The maximum values of the compression wave

dP/dt :

Pressure gradient

e :

Specific internal energy

H ref :

Height of the passenger train, 3.2 m

k :

Turbulent kinetic energy (TKE)

k eff :

Effective thermal conductivity

KTX :

Korea Train eXpress

MPW :

Micro-pressure wave

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 0 :

Time of the beginning of the compression wave

T* :

Shifted time

u τ :

Friction velocity

u i :

Velocity components according to the directions in the Cartesian coordinate

V tr :

Train velocity

wH :

With hood case

w/oH :

Without hood case

x i :

Directions in the Cartesian coordinate

x* :

Calculated x coordinate relative to the hood entrance point

x h :

X coordinate from the tunnel hood

x t :

X coordinate from the tunnel exit

y + :

Wall-normal distance at the first layer

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Acknowledgments

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant no. RS-2022-0014-3396).

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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

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  1. Beomsu Kim
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Correspondence to Junsun Ahn or Hyeokbin Kwon.

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Beomsu Kim is a Ph.D. 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 a Professor of the Department of Railway Vehicle System Engineering, Korea National University of Transportation, Uiwang, Gyeonggi-do, 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. Numerical study of the effect of the tunnel hood on micro-pressure wave for increasing high-speed train operation speed. J Mech Sci Technol 38, 721–733 (2024). https://doi.org/10.1007/s12206-024-0122-0

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  • DOI: https://doi.org/10.1007/s12206-024-0122-0

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