Window ejected flame width and depth evolution along facade from under-ventilated enclosure fires |
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Affiliation: | 1. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;2. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;4. China Ship Development and Design Center, Wuhan, Hubei 430064, China;1. Faculty of Engineering, China University of Geoscience (Wuhan), Wuhan, Hubei 430074, China;2. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China |
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Abstract: | This paper investigates window ejected flame width and depth evolutions along facade from under-ventilated enclosure fires. Experiments are carried out by 1:4 scale model. Two CCD cameras are employed to record the evolutions of flame depth and width. The flame base position (vertical height above the bottom of the opening), flame depth (width) along with their maximum values and corresponding positions (vertical height above the flame base position) are measured and analyzed by non-dimensional scaling. It is found that the flame base position is independent of fire heat release rate and its ratio to opening height is nearly the same. The flame depth for all heat release rates and the flame width for openings with aspect ratio in the range of (the “(semi-) axi-symmetrical flame type”) first increases, reaching a maximum value and then decreases with height. However, for the opening with a relative larger aspect ratio () (“wall flame type”), the flame width decreases monotonously with height. The maximum flame width and its corresponding vertical position for “(semi-) axi-symmetrical flame type” are found to be well correlated by characteristic length scale =] non-dimensionally after normalized by the flame height. Meanwhile, the maximum flame depth for all conditions is found to be well correlated by characteristic length scale =] non-dimensionally after normalized by the flame height. |
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Keywords: | Facade flame Flame base height Flame width (depth) Characteristic length scale Under-ventilated enclosure fire |
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