| 火灾条件下气溶胶灭火剂固体微粒沉降过程分析 |
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| 引用本文： | 陈长坤.火灾条件下气溶胶灭火剂固体微粒沉降过程分析[J].中国工程科学,2010,12(1):48-51. |
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| 作者姓名： | 陈长坤 |
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| 作者单位： | 中南大学土木建筑学院防灾科学与安全技术研究所,长沙,410075;河南理工大学煤矿瓦斯与火灾防治重点实验室,河南焦作,454003 |
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| 基金项目： | 河南省煤矿瓦斯与火灾防治重点实验室开放基金项目(HKLGF200503);;国家自然科学基金项目(50706059) |
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| 摘 要： | 对火灾下气溶胶灭火剂固体微粒的空间分布特点及沉降过程进行了非稳态分析,给出了微粒粒径对其运动状态的影响特征,对固体微粒在流场中的稳定性及滞留时间进行了研究,获得了微粒到达火源表面的临界粒径表达式。结果表明,微粒沉降过程其沉降的雷诺数与粒子直径相关,且基本处于低雷诺数状态,沉降速度与微粒粒径的平方成正比。当微粒直径小于100μm时,将在很短时间内达到相对稳定的流动状态;当微粒直径达到1μm时,可在空间中长期滞留,并通过卷吸进入火焰区域,达到灭火的效果。
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| 关 键 词： | 固体微粒 气溶胶灭火剂 沉降过程 |
| 收稿时间： | 2007/5/29 0:00:00 |
| 修稿时间： | 1/2/2008 12:00:00 AM |
Analysis on the depositing process of the solid particulates
produced by aerosol fire suppressants
under fire conditionsChen |
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| Chen Changkun.Analysis on the depositing process of the solid particulates
produced by aerosol fire suppressants
under fire conditionsChen[J].Engineering Science,2010,12(1):48-51. |
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| Authors: | Chen Changkun |
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| Affiliation: | 1.Institute of Disaster Prevention Science & Safety Technology;Central South Univ.;Changsha 410075;China;2.Henan Key Lab.of Preventing and Curing on Coal Mine Gas & Fire;Henan Polytechnic Univ.;Jiaozuo;Henan 454003;China |
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| Abstract: | In this paper,unsteady analysis was conducted on the space distribution and depositing process of the solid particulates produced by aerosol fire suppressants under fire conditions.How the particles diameters affects their movement was demonstrated.The features of the particle diameters affecting the movement status were presented.The stability and resort time for the solid particles in the flow filed was explored.And the expression of the criterion(critical) diameter for a particle depositing to the fire s... |
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| Keywords: | solid particulates aerosol fire suppressant depositing process |
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