| 宋虎,杨立中,范维澄.通风开口对轰燃影响的数值模拟[J].火灾科学,2001,10(3):167-170. |
| 通风开口对轰燃影响的数值模拟 |
| Numerical Simulation of Effect of Ventilation on Flashover |
| 投稿时间：2001-04-30 修订日期：2001-06-12 |
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| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目:国家自然科学基金重点项目资助(59936140) |
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| 中文关键词: 轰燃 通风 室内火灾 |
| 英文关键词:flashover ventilation compartment fire |
| 摘要点击次数: 475 |
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| 中文摘要: |
| 轰燃是建筑火灾中的一个重要的火现象 ,室内局部火的发展过程中 ,热烟气向火源基底辐射 ,在一定条件下会产生正反馈 ,导致热烟气温度和火源释放速率急剧增加 ,从而转变成遍及整个房间的大火。轰燃的产生与否受到很多因素的影响 ,尝试利用CFAST对轰燃现象进行数值模拟 ,讨论了不同的通风开口条件对轰燃发生时热烟气温度和热释放速率的影响。计算结果表明 ,当开口面积固定时 ,竖直开口比水平开口需要更大的火源释热速率。另外也指明了 ,多数情况下用CFAST对轰燃进行计算是可能的 ,但在某些临界条件下计算会终止. |
| 英文摘要: |
| Flashover is an important phenomenon in compartment fires. During the development of a local fire, the radiation feedback from the upper hot layer to the fire base is built in critical conditions, which increases the temperature of the upper hot layer and the release rate of the fire source. Afterwards, the local fire becomes involved in the whole room rapidly. Whether or not flashover occurs depends on many parameters. This paper focuses on the numerical computation of flashover by using CFAST. Different ventilation conditions were considered. The results of the CFAST computation show that under the circumstance that the ventilation is a constant, more release rate from the fire base is needed in a vertical ventilation than a horizontal one. |
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