Study on Fire Spread Prevention of Building Components by Water Discharge System under Heating

Bulletin of Japan Association for Fire Science and Engineering Pub Date : 2010-12-01 DOI:10.11196/KASAI.60.2_29

Y. Ohmiya, Masaki Noaki, Jun-ichi Suzuki, Takemasa Kobayashi, Mitsuru Ohta

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Abstract

The full scale tests were carried out to grasp behavior of water film supplied by water discharge system under heating conditions. The specimen was a steel plate of 2438 mm height, 1219 mm width and 6 mm thickness. The intermediate furnace at Tokyo University of Science was used as radiation panel. The radiation panel was placed parallel to the specimen at some distance. The experimental conditions have changed the heat flux rate from radiation panel to specimen covered with water film, the water supply rate gushed from water discharge head and so on. The water film was almost uniform from the top of the specimen to the bottom by using this water discharge system. As the results of experiments, the behavior of water film is clearly involved to the water supply rate and the relation could be marshaled by using Reynolds number based on a simple vis-cous layer model. The water film temperature became higher so that the water supply rate decreases. Based on the experiment results the empirical formula has been developed to calculate the temperature-rise of water under any heating conditions. Abstract

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供热条件下排水系统建筑构件防火研究

为掌握排水系统供水水膜在加热条件下的性能，进行了全尺寸试验。试件为高2438mm、宽1219mm、厚6mm的钢板。以东京理科大学的中间炉为辐射板。辐射板与标本平行放置一段距离。实验条件改变了从辐射板到覆盖水膜试样的热流密度、从排水头喷出的供水量等。采用该排水系统后，试样的水膜从顶部到底部基本均匀。实验结果表明，水膜的行为与供水速率有明显的关系，这种关系可以用基于简单可见层模型的雷诺数来表示。水膜温度升高，供水速率降低。在实验结果的基础上，推导出了任意加热条件下水温升的经验公式。摘要

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Bulletin of Japan Association for Fire Science and Engineering

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