Performance validation of a hybrid ventilation strategy comprising longitudinal and point ventilation by a fire experiment using a model-scale tunnel |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan;2. Graduate School of Mechanical Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan;3. School of Mechanical Engineering, Kanazawa University, Kakuma-machi, Kanazawa-shi, Ishikawa 920-1192, Japan;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Yangzhou Fire Detachment, Fire Bureau of Jiangsu Province, Yangzhou 225000, China;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;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Centre for Environmental Safety and Risk Engineering, Victoria University, Melbourne, VIC 8001, Australia;1. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, Heilongjiang, China;2. Research Centre for Fire Engineering, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, Anhui 230009, China;2. Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin 300381, China;1. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, China;2. College of Civil Engineering, Fuzhou University, Fuzhou, China;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, China |
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| Abstract: | We examined the exhaust performance of a hybrid ventilation strategy for maintaining a safe evacuation environment for tunnel users in a tunnel fire. The hybrid ventilation strategy combines the longitudinal ventilation strategy with the point ventilation strategy which is a type of transverse ventilation strategy. The model tunnel developed by this study was scaled to 1/5 the size of a full-scale tunnel. The model-scale experiment was performed taking into consideration Froude's law of similarity. Measurement items were the distribution of temperature and concentration of smoke inside the tunnel, longitudinal wind velocity, mass flow of smoke in the point ventilation duct, and the heat release rate of the fire source. The following main conclusions were obtained. The smoke height was constant even when varying the extraction rate of smoke from the ceiling vent. The backlayering length and critical velocity of the smoke flow in the hybrid strategy could be predicted by the methodology developed by using the longitudinal strategy. The hybrid strategy maintained a safe evacuation environment on both sides of the tunnel fire. |
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| Keywords: | Hybrid ventilation Longitudinal ventilation Point ventilation Tunnel fire Smoke height Model experiment |
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