Journal
ENERGY AND BUILDINGS
Volume 253, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2021.111540
Keywords
Ceiling temperature; Blockage effect; Tunnel slope; Closed portal; Metro fire
Funding
- Graduate Scientific Research and Innovation Foundation of Chongqing, China [CYB20029, CYS19009]
- Chongqing Science and Technology Commission [cstc2019jscx-msxmX0243]
- Chongqing Construction Science and Technology Planning Project 459 [2019(15-5)]
- China Scholarship Council [202006050098]
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The study investigated the coupling effect of blockage and tunnel slope on fire smoke spreading and ceiling temperature distribution in a metro depot with one closed end. It compared the fire plume behavior and ceiling temperature distribution in different slope situations and highlighted the impact of blockage on heat accumulation and fire burning rate. The coupling effect of blockage and tunnel slope was analyzed in relation to high temperature area at tunnel ceiling, and empirical correlations were proposed for temperature prediction.
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. (c) 2021 Elsevier B.V. All rights reserved.
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