A study of the critical velocity and the confinement velocity of fire accident in a longitudinally ventilated underground train with different door opening scenarios

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Su, Z., Li, Y., Feng, S., Zhong, H. ORCID: 0000-0001-9604-4523, Li, J., Liu, W., Chen, C. and Li, J., 2023. A study of the critical velocity and the confinement velocity of fire accident in a longitudinally ventilated underground train with different door opening scenarios. Tunnelling and Underground Space Technology, 131: 104776. ISSN 0886-7798

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Official URL: https://doi.org/10.1016/j.tust.2022.104776

Abstract

The critical velocity, confinement velocity and smoke back-layering length are significant factors for smoke control in a tunnel fire. This research aims to analysis the correlation of these 3 key smoke control parameters in the different door opening scenarios during a fire in the metro train carriage that stopped in the tunnel. Scaled model experiment measurement and numerical simulations were carried out for the propagation and control of smoke. Five fire locations in the train and two side doors opening scenarios of the train were considered. Results show that smoke back-layering length in the train can be barely influenced by the activation time of the longitudinal ventilation system. However, the opening of side doors could result in a shorter smoke back-layering length in the train. Furthermore, we present a dimensionless correlation for the critical velocity and confinement velocity of underground train fires caused by fires in the double-length narrow space of an underground tunnel. This study provides a predictive model for the design of smoke control systems for fire of train stopped in underground tunnels.

Item Type:

Journal article

Publication Title:

Tunnelling and Underground Space Technology

Creators:

Su, Z., Li, Y., Feng, S., Zhong, H., Li, J., Liu, W., Chen, C. and Li, J.

Publisher:

Elsevier

Date:

January 2023

Volume:

131