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The effect of blockage and tunnel slope on smoke spread and ceiling temperature distribution in a natural-ventilated metro depot

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Han, Jiaqiang, Wang, Zihao, Geng, Pengqiang, Wang, Fei, Wen, Jennifer X. and Liu, Fang (2021) The effect of blockage and tunnel slope on smoke spread and ceiling temperature distribution in a natural-ventilated metro depot. Energy and Buildings, 253 . 111540. doi:10.1016/j.enbuild.2021.111540 ISSN 0378-7788.

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Official URL: http://dx.doi.org/10.1016/j.enbuild.2021.111540

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Abstract

The current research investigated the coupling effect of blockage and tunnel slope on spreading characteristics of the fire smoke and ceiling temperature distribution in a metro depot with one closed end. A series of 1/15 reduced scale experiments and full-scale numerical simulations were conducted to capture the global fire characteristics. The investigation addressed and compared the effect of tunnel slope on the fire plume behavior and ceiling temperature distribution in both uphill and downhill situations. The presence of the blockage upstream of the fire was further investigated to highlight the heat accumulation between the closed end and fire, and the associated effect on the pool fire mass burning rate. Comparison has been made between the ceiling temperature distribution of when the tunnel slope increases in both uphill and downhill tunnels. The coupling effect of blockage and tunnel slope was analyzed in relation to the maximum and extent of high temperature area at tunnel ceiling. Two empirical correlations have also been proposed to predict the maximum temperature and upstream temperature attenuation in a metro depot, accounting for the influence of blockage and tunnel slope. Comparison among the measurements, predicted values, literature models and data exhibit relatively good agreement.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TH Building construction
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Ceilings -- Thermal properties , Temperature measurements , Smoke plumes , Buildings -- Smoke control systems, Fire prevention, Tunnels -- Fires and fire prevention
Journal or Publication Title: Energy and Buildings
Publisher: Elsevier
ISSN: 0378-7788
Official Date: 15 December 2021
Dates:
DateEvent
15 December 2021Published
5 October 2021Available
30 September 2021Accepted
Volume: 253
Article Number: 111540
DOI: 10.1016/j.enbuild.2021.111540
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 25 October 2021
Date of first compliant Open Access: 5 October 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
CYB20029Graduate Scientific Research and Innovation Foundation of ChongqingUNSPECIFIED
CYS19009Graduate Scientific Research and Innovation Foundation of ChongqingUNSPECIFIED
cstc2019jscx-msxmX0243Chongqing Science and Technology Commissionhttp://dx.doi.org/10.13039/501100002865
2019(1-5-5)Chongqing Construction Science and TechnologyUNSPECIFIED
202006050098China Scholarship Councilhttp://dx.doi.org/10.13039/501100004543

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