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CSME 2019/08
Volume 40 No.4
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385-392
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Effect of Post-Flashover Flame Emerging From Opening On External Wall
Wei-Ting Chunga and Kuang-Chung Tsaia
aDepartment of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Taiwan 811, ROC.
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Abstract:
This study performed experiments in which small-scale enclosures with various opening shapes and locations were underpinned for flames on facades emerging from ventilation-controlled fires at the floor of fire origin. To limit uncertainties, a propane gas burner was used to produce controlled heat release rates (30, 40 and 50 kW) as fire source. The size of opening (in W×H) was 20×10 cm2, 10×20 cm2 and 20×20 cm2. Actual heat release rate, gas temperature inside the enclosure, heat flux on the facade wall, and flame contours were measured. Experimental observations and data show that the shape of opening strongly affected the combustion conditions. Opening geometry was divided into two categories: those that combust both inside and outside the enclosure, and combusting primarily outside the enclosure. Two sets of heat flux correlations were derived for the two categories. Additionally, external flame was higher for the category of combustion primarily outside the enclosure, because pyrolyzate primarily burned there. Furthermore, experimental results indicate that the highest heat flux always occurred with the lowest openings, although the difference was not significant.
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Keywords: external wall fire, building opening, heat flux, flame height, combustion condition.
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©
2019
CSME , ISSN 0257-9731
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