The influence of vehicular obstacles on longitudinal ventilation control in tunnel fires |
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| Affiliation: | 1. Research Centre for Fire Engineering, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, Heilongjiang, China;3. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China;1. College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;2. National Demonstration Center for Experimental Mining Engineering Education (Shandong University of Science and Technology), Qingdao, Shandong 266590, China;1. Research Centre for Fire Engineering, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, Heilongjiang, China;3. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China;1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu City, Sichuan Province, China;2. School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu City, Sichuan Province, China;3. Key Laboratory of Fire-fighting and Rescue Technology of the Ministry of Public Security, China People''s Police University, 220 Xichang Road, Langfang City, Hebei Province, China |
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| Abstract: | The effect of the vehicular blockage in a tunnel under longitudinal ventilation smoke control was systematically studied using a small-scale tunnel (1:30 of a standard tunnel section) with a helium-air mixture as the buoyant plume. The experimental results showed excellent agreement with full-scale data and reference correlations from former studies. When there are vehicular obstacles in the tunnel, the critical velocity decreased as a function of the blockage ratio. Notwithstanding, it was found that the relative size of the vehicular obstacle and the relative location of the fire source can have a reversed effect, inasmuch as the presence vehicular obstacle exerted an influence on the critical and confinement velocities. Moreover, the backlayering distance was evidently affected by the vehicular blockage. A parallel analysis was carried out for the backlayering distance for lower and upper regimes of the dimensionless heat release rate, where the current data was compared against data from other studies. The method and experimental set-up proved their ability to reproduce several phenomena and thus also their capability to supply relevant and valuable information on the effect of the vehicular blockage on tunnel fire dynamics. |
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| Keywords: | Vehicular blockage Critical velocity Longitudinal velocity Confinement velocity Backlayering distance Dimensionless heat release rate regimes |
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