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Study of Blockage Effects of Metro Train on Critical Velocity in Sloping Subway Tunnel Fires with Longitudinal Ventilation

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  • Haitao Wang

    (College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China)

  • Huanhuan Gao

    (College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China)

Abstract

Critical velocity is very important for smoke control in longitudinally ventilated subway tunnel fires. Numerical investigations are conducted in this paper to study the impacts of metro train blockages on critical velocity in sloping subway tunnel fires by using fire dynamics simulator (FDS) tunnel models validated with the field-experiment data. Moreover, a global model of critical velocity is presented for the blocked zone of a metro train in subway tunnel fires including influencing factors of the blockage ratio and tunnel slope. The results show that the reduction ratio of critical velocity in the blocked zone is less than the metro-train blockage ratio. The correction factor between the critical velocity reduction ratio and metro-train blockage ratio is 0.545. The aerodynamic shadow zone downstream of a subway train blockage has important impacts on the critical velocity. The critical velocity in the unblocked zone of a metro train is higher than that in the blocked zone of a metro train blockage. The reason is that smoke flow is hindered by the metro train blockage in subway tunnel fires. With an increase in the blockage–fire source distance, the critical velocity first decreases and then tends to be constant. The global model presented can accurately predict the critical velocity in a sloping subway tunnel with a train blockage. The results may provide beneficial suggestions for designing ventilation systems for subway tunnels.

Suggested Citation

  • Haitao Wang & Huanhuan Gao, 2022. "Study of Blockage Effects of Metro Train on Critical Velocity in Sloping Subway Tunnel Fires with Longitudinal Ventilation," Energies, MDPI, vol. 15(15), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5762-:d:883414
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    References listed on IDEAS

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    1. Kai Ye & Xiaodong Zhou & Lizhong Yang & Xiao Tang & Yuan Zheng & Bei Cao & Yang Peng & Hong Liu & Yong Ni, 2019. "A Multi-Scale Analysis of the Fire Problems in an Urban Utility Tunnel," Energies, MDPI, vol. 12(10), pages 1-20, May.
    2. Younggi Park & Youngman Lee & Junyoung Na & Hong Sun Ryou, 2019. "Numerical Study on the Effect of Tunnel Aspect Ratio on Evacuation with Unsteady Heat Release Rate Due to Fire in the Case of Two Vehicles," Energies, MDPI, vol. 12(1), pages 1-12, January.
    3. Matthew Craig & Taimoor Asim, 2020. "Numerical Investigations on the Propagation of Fire in a Railway Carriage," Energies, MDPI, vol. 13(19), pages 1-22, September.
    4. Zhiqiang Tang & Ke Gao & Yafei Shan & Chengyao Zhu & Zeyi Liu & Zimeng Liu, 2022. "Study of the Fire Behavior of Multilayer Cables in a Mine Tunnel," Energies, MDPI, vol. 15(6), pages 1-19, March.
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    Cited by:

    1. Hanna Jędrzejuk & Faustyna Orzełowska, 2023. "Analysis of the Operation of Smoke Exhaust Ventilation in the Metro’s Technological Corridor Based on Numerical Simulation of Selected Locations of Fire," Energies, MDPI, vol. 16(2), pages 1-18, January.

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