Journal
FIRE AND MATERIALS
Volume 42, Issue 8, Pages 974-984Publisher
WILEY
DOI: 10.1002/fam.2683
Keywords
fire location; longitudinal wind; natural ventilation; shaft; tunnel
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Funding
- Fundamental Research Funds for the Central Universities [JZ2017HGTB0210]
- Hunan Provincial Natural Science Foundation of China [2017JJ3392]
- National Natural Science Foundation of China [51608163, 51804338]
- National Key R&D Program of China [2017YFC0803300]
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Investigation of natural ventilation using shafts in tunnels has been receiving more attentions; however, analyses on how fire position influences the natural ventilation performance have rarely been addressed. This study investigated the influence of different fire positions between two shafts on natural ventilation effectiveness in a tunnel by large eddy simulation. The smoke movement characteristics were studied in detail, with systematically varying the fire position between two shafts and the longitudinal wind speed in the tunnel. The typical smoke characteristic parameters, such as temperature distribution, mass flow rate and CO concentration were emphatically investigated. Some special phenomena, such as plug-holing and smoke bifurcation, were also discussed.
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