Determination of smoke layer interface height of medium scale tunnel fire scenarios |
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| Affiliation: | 1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;2. Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin 300381, China;3. School of Transportation Engineering, Hefei University of Technology, 230009, China;4. College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, 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. School of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, PR China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, JinZhai Road 96, Hefei, Anhui 230026, China;2. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;3. Arup International Consultants (Shanghai) Co., Ltd., Beijing Branch, Beijing 100026, China;4. Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin 300381, China;1. Safety Management Course, Faculty of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;2. Maritime Risk Assessment Department, National Maritime Research Institute, 6-38-1, Shinkawa, Mitaka, Tokyo 181-0004, Japan;3. I.T. Solution Department, Kajima Corporation, 6-5-30 Akasaka, Minato-ku, Tokyo 107-8502, Japan |
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| Abstract: | Smoke layer interface height is an important parameter in fire safety science. In this paper, a series of experiments were conducted in a 1/6th scale model tunnel for determining the smoke layer interface height in medium scale tunnel fire scenarios. The commonly used approaches, including visual observation, N-percentage rule and integral method are reviewed firstly. Then, considering the subjectivity and empiricism of previous approaches, a buoyancy frequency method is put forward based on the vertical temperature distribution in tunnel, which has definite physical meaning and eliminates the subjectivity of previous methods. The smoke layer thicknesses determined by buoyancy frequency method are compared with the results of visual observation, N-percentage rule (N = 10, 20, 30) and integral ratio method, respectively. The comparison results reveal that the smoke layer thicknesses determined by buoyancy frequency method fit best with the visual values for all the experimental conditions. While the calculated values by integral ratio method are lower than the visual values. In addition, the selection of optimum N values for the N-percentage rule in different cases is also discussed. |
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| Keywords: | Interface height Tunnel fire Temperature distribution Buoyancy frequency |
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