Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal |
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| Affiliation: | 1. Faculty of Urban Construction and Environment Engineering, Chongqing University, Chongqing 400045, PR China;2. Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing 400045, PR China;3. National Centre for International Research of Low-carbon and Green Buildings, Chongqing 400045, PR China;4. Department of Civil Engineering, Aalborg University, DK-9000 Aalborg, Denmark;1. Institute of Disaster Prevention Science and Safety Technology, Central South University, Changsha, Hunan, China;2. Key Laboratory of Gas and Fire Prevention of Henan Province, Henan Polytechnic University, Jiaozuo, Henan, China;3. Zhejiang Provincial Institute of Communications Planning, Design and Research, Hangzhou, Zhejiang, China;1. Department of Civil Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;2. Department of Mechanical Engineering, Imperial College London, SW7 2AZ London, UK;3. Exponent Inc., 9 Strathmore Rd, Natick, MA, USA;4. Greater Copenhagen Fire Department, Bag Rådhuset 3, 1550 Copenhagen W, Denmark;1. Department of Aeronautics, Imperial College London, United Kingdom;2. Department of Mechanical Engineering, Imperial College London, United Kingdom;3. Fire & Risk, AECOM, United Kingdom;1. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;3. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, 1239 Siping Road, Shanghai 200092, China;4. Shanghai Urban Construction Design & Research Institute, 3447 Dongfang Road, Shanghai 200125, China |
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| Abstract: | Three full-scale model experiments were conducted in a unidirectional tube, which is a part of a metro tunnel with one end connected to an underground metro station and the other end opened to outside in Chongqing, PR China. Three fire HRRs, 1.35 MW, 3 MW and 3.8 MW were produced by pool fires with different oil pan sizes in the experiments. Temperature distributions under the tunnel ceiling along the longitudinal direction were measured. At the same time, CFD simulations were conducted under the same boundary conditions with the experiments by FDS 5.5. In addition, more FDS simulation cases were conducted after the FDS simulation results agreed with the experimental results. The simulation results show that the smoke temperature and the decay rate of the temperature distribution under the tunnel ceiling along the longitudinal direction increase as HRR increases. The smoke exhausts effectively from the tunnel under mechanical ventilation system, whether the emergency vent is activated as a smoke exhaust or an air supply vent. The operation mode of the mechanical ventilation system depends on the evacuation route. |
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| Keywords: | Smoke control Metro tunnel Full-scale experiment CFD simulation |
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