Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 82, Issue -, Pages 99-110Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2018.08.004
Keywords
Environmental wind; Tunnel; Shaft; Natural ventilation; Smoke spread
Funding
- National Key R&D Program of China [2017YFC0803300]
- National Natural Science Foundation of China [51608163, 51676210]
- Hunan Provincial Natural Science Foundation of China [2017JJ3392]
- Fundamental Research Funds for the Central Universities
- Opening Fund of Key Laboratory of Building Fire Protection Engineering and Technology of MPS [KFKT2015MS03]
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In order to investigate the effect of strong environmental wind on a tunnel fire under natural ventilation, a series of numerical simulations were conducted using large eddy simulation method in this study. A tunnel model was established by a numerical simulation software, Fire Dynamics Simulator, to investigate the smoke movement under the stack effect induced inside a shaft. Four environmental wind speeds (39 m/s) and three heat release rates (3-20 MW) were considered. The smoke spread velocity inside the tunnel, downdraught phenomenon at the early stage of fire, smoke exhaust characteristics at the steady period of fire, temperature distribution in the tunnel and shaft, and occurrence of plug-holing were studied in detail, based on some typical characteristic parameters, such as mass flow rate, temperature and velocity vector. The results can be considered as a reference for the fire protection design of a tunnel with natural ventilation.
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