Critical velocity and range of a fire-gas plume in a ventilated tunnel |
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| Institution: | 1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, China;2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong, China;1. Mechanical Engineering, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan;2. Mechanical Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan;3. Center for Environmental Safety and Risk Engineering, Victoria University, P.O. Box 14428, Melbourne, Victoria 8001, Australia;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Civil and Infrastructure Engineering Discipline, School of Engineering, RMIT University, Melbourne, VIC 3001, Australia;1. School of Civil Engineering, Central South University, Changsha, China;2. Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure, Central South University, Changsha, China;1. Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, PR China;2. Dept. of Flow, Heat and Combustion Mechanics, Ghent University – UGent, Sint-Pietersnieuwstraat 41, B-9000 Gent, Belgium;3. Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing 400045, PR China;4. National Centre for International Research of Low-carbon and Green Building, Chongqing 400045, PR China |
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| Abstract: | To protect passengers, personnel and equipment in a tunnel fire, it is important to understand and predict the movements of the hot-gas plume. To estimate the range of a fire plume propagating under the ceiling, a model is presented, that depends on two important parameters, i.e. the energy release rate of the fire and the velocity of the ventilation flow. The theoretical results, concerning the upwind range of the plume, agree favourably with experimental data obtained from eight tunnel fire tests. The theoretical value of the critical ventilation velocity, required to arrest the upwind movement of the fire-gas, agrees well with the corresponding experimental results for a wide range of energy release rates. The influences of air entrainment, friction at the ceiling and the associated heat loss are analysed and the results discussed. |
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