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Numerical Analysis of the Tunnel-Train-Air Interaction Problem in a Tunnel with a Double-Hat Oblique Hood

Zongfa Zhang1, Minglu Zhang1,*, Xinbiao Xiao2

1 School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
2 State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

* Corresponding Author: Minglu Zhang. Email: email

Fluid Dynamics & Materials Processing 2023, 19(2), 345-359. https://doi.org/10.32604/fdmp.2022.020233

Abstract

The tunnel-train-air interaction problem is investigated by using a numerical method able to provide relevant information about pressure fluctuations, aerodynamic drag characteristics and the “piston wind” effect. The method relies on a RNG k-ε two-equation turbulence model. It is shown that although reducing the oblique slope can alleviate the pressure gradient resulting from initial compression waves at the tunnel entrance, the pressure fluctuations in the tunnel are barely affected; however, a large reduction of micro-pressure wave amplitudes is found outside the tunnel. In comparison to the case where no tunnel hood is present, the amplitudes of micro-pressure waves at 40 m from the tunnel reach an acceptable range. The aerodynamic drag of the head and tail fluctuates greatly while that of the intermediate region undergoes only limited variations when the high-speed train passes through the double-hat oblique tunnel. It is shown that the effects of the oblique slope of the portal on the aerodynamic drag can almost be ignored while the train speed plays an important role.

Graphical Abstract

Numerical Analysis of the Tunnel-Train-Air Interaction Problem in a Tunnel with a Double-Hat Oblique Hood

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Cite This Article

Zhang, Z., Zhang, M., Xiao, X. (2023). Numerical Analysis of the Tunnel-Train-Air Interaction Problem in a Tunnel with a Double-Hat Oblique Hood. FDMP-Fluid Dynamics & Materials Processing, 19(2), 345–359.



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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