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    The Influence of Oblique Tunnel Portals and Blockage Ratio on the Aerodynamic Performance of Urban Rapid Rail Tunnels

    Source: Journal of Fluids Engineering:;2025:;volume( 147 ):;issue: 008::page 81301-1
    Author:
    Weng, Miaocheng
    ,
    Zhang, Yu
    ,
    Xiong, Kang
    ,
    Liu, Fang
    ,
    Zhu, Xinyi
    ,
    Zou, Zhenbo
    DOI: 10.1115/1.4067788
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The study aims to understand the differences in aerodynamic pressure between urban rapid rail (URR) transit and high-speed railway tunnels caused by different tunnel portal structures. In this paper, a three-dimensional compressible turbulent flow model is used to simulate trains entering tunnels with three portal forms. The effects of tunnel portal forms and blockage ratio on the aerodynamic interaction between trains and tunnels are analyzed. Using full-scale test data, the reliability of simulating train entry into the tunnel is verified. Based on validated simulations, peak values and maximum pressure gradients are investigated for the three scenarios mentioned above. As a result, the transient pressure caused by the three types of inclined portals does not differ significantly, but it affects a train's surface pressure varies over time. The ring oblique and reversed ring oblique portals both reduce primary compression wave's maximum pressure gradient, while reversed ring oblique portals exhibit better performance. In addition, the study also identifies a critical blockage ratio β*, which determines the opposing effects of the two portal types in mitigating the aerodynamic interaction.
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      The Influence of Oblique Tunnel Portals and Blockage Ratio on the Aerodynamic Performance of Urban Rapid Rail Tunnels

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4308740
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    • Journal of Fluids Engineering

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    contributor authorWeng, Miaocheng
    contributor authorZhang, Yu
    contributor authorXiong, Kang
    contributor authorLiu, Fang
    contributor authorZhu, Xinyi
    contributor authorZou, Zhenbo
    date accessioned2025-08-20T09:43:07Z
    date available2025-08-20T09:43:07Z
    date copyright3/11/2025 12:00:00 AM
    date issued2025
    identifier issn0098-2202
    identifier otherfe_147_08_081301.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4308740
    description abstractThe study aims to understand the differences in aerodynamic pressure between urban rapid rail (URR) transit and high-speed railway tunnels caused by different tunnel portal structures. In this paper, a three-dimensional compressible turbulent flow model is used to simulate trains entering tunnels with three portal forms. The effects of tunnel portal forms and blockage ratio on the aerodynamic interaction between trains and tunnels are analyzed. Using full-scale test data, the reliability of simulating train entry into the tunnel is verified. Based on validated simulations, peak values and maximum pressure gradients are investigated for the three scenarios mentioned above. As a result, the transient pressure caused by the three types of inclined portals does not differ significantly, but it affects a train's surface pressure varies over time. The ring oblique and reversed ring oblique portals both reduce primary compression wave's maximum pressure gradient, while reversed ring oblique portals exhibit better performance. In addition, the study also identifies a critical blockage ratio β*, which determines the opposing effects of the two portal types in mitigating the aerodynamic interaction.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThe Influence of Oblique Tunnel Portals and Blockage Ratio on the Aerodynamic Performance of Urban Rapid Rail Tunnels
    typeJournal Paper
    journal volume147
    journal issue8
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4067788
    journal fristpage81301-1
    journal lastpage81301-13
    page13
    treeJournal of Fluids Engineering:;2025:;volume( 147 ):;issue: 008
    contenttypeFulltext
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