| 热烟气流过顶棚开口的形式及流率的计算 |
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| 引用本文： | 霍然 李昌烽. 热烟气流过顶棚开口的形式及流率的计算[J]. 中国科学技术大学学报, 1996, 26(3): 324-328 |
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| 作者姓名： | 霍然 李昌烽 |
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| 作者单位： | 火灾科学国家重点实验室 |
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| 摘 要： | 在小尺寸房间模型内，研究了热烟气流过顶棚开口的形式，指出在Ｌ／Ｄ（顶棚的厚度与开口直径比）较小的情况，可出现五种主要流型；并对烟气流率的计算方法作了讨论，提出的改进算法综合考虑了室内外气体的密度差和Ｌ／Ｄ的影响，在Ｌ／Ｄ＝（０．０１—０．６）的范围内，与实验数据符合得较好．
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| 关 键 词： | 建筑火灾，顶棚开口，密度差，烟气流率 |
Some Discussions on the Flow Pattern and Flow Rate of Smoke through a Ceiling Opening in Enclosure Fire |
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| Huo Ran,Li Changfeng,Liu Binghai. Some Discussions on the Flow Pattern and Flow Rate of Smoke through a Ceiling Opening in Enclosure Fire[J]. Journal of University of Science and Technology of China, 1996, 26(3): 324-328 |
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| Authors: | Huo Ran Li Changfeng Liu Binghai |
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| Affiliation: | State Key Laboratory of Fire Science |
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| Abstract: | he flow pattern of smoke flowing through a ceiling opening is investigated in a reducedscale model, and five major Patterns are found at a relatively small L/D (ceiling length to opening diameter). The calculation of smoke flow rate is discussed too. The proposed method considered both the density difference of smoke and air, and the L/D variation are taken into consideration in the proposed method for improvement. The calculation resultS is in good agreement with the test data. It iS pointed out the effects of L/D can not be neglected in calculation. |
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| Keywords: | Building fire Ceiling opening Density difference Volume flow rate. |
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