| 楼梯井内火灾过程的大涡模拟 |
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| 引用本文： | 秦挺鑫,郭印诚,张会强,王希麟,林文漪.楼梯井内火灾过程的大涡模拟[J].工程热物理学报,2004,25(1):177-179. |
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| 作者姓名： | 秦挺鑫 郭印诚 张会强 王希麟 林文漪 |
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| 作者单位： | 清华大学工程力学系,北京,100084;清华大学工程力学系,北京,100084;清华大学工程力学系,北京,100084;清华大学工程力学系,北京,100084;清华大学工程力学系,北京,100084 |
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| 基金项目： | 国家重点基础研究专项经费资助(No.2001CB409600) |
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| 摘 要： | 针对建筑物楼梯井内的火灾过程,采用大涡模拟方法,探讨了不同释热速率对楼梯井内火灾过程中空气卷吸量、楼梯井内平均氧气浓度、平均温度以及楼梯井内外最大压差的影响,分析了火灾烟气流动的动力学特征。研究结果表明,随着释热速率的增加,楼梯井空气卷吸量增加,但由于氧气的消耗量也在增加,导致楼梯井内平均氧气浓度降低。此外,释热速率越大,则楼梯井内温度越高,导致楼梯井内外最大压差增加,增强楼梯井的抽风拔为效应,加快了火灾烟气的蔓延。
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| 关 键 词： | 火灾 楼梯井 释热速率 大涡模拟 |
| 文章编号： | 0253-231X(2004)01-0177-03 |
| 修稿时间： | 2003年11月26 |
LARGE EDDY SIMULATION OF A STAIRWELL FIRE |
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| QIN Ting-Xin GUO Yin-Cheng ZHANG Hui-Qiang WANG Xi-Lin LIN Wen-Yi.LARGE EDDY SIMULATION OF A STAIRWELL FIRE[J].Journal of Engineering Thermophysics,2004,25(1):177-179. |
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| Authors: | QIN Ting-Xin GUO Yin-Cheng ZHANG Hui-Qiang WANG Xi-Lin LIN Wen-Yi |
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| Abstract: | Fire dynamics behaviors in a stairwell were investigated by means of large eddy simulation in this paper. With changing the total heat release rate (HRR), the characteristics of smoke flow in the stairwell fire were analyzed. It is found that the air quantity increases with the HRR, and the consumption of oxygen increases too, this gives rise to the decrease of the average oxygen concentration in the stairwell. Predicted results show that the averaged temperature and the maximum pressure difference between the ambient air and inside of the stairwell would become larger when HRR increasing. |
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| Keywords: | fire stairwell heat release rate (HRR) large eddy simulation |
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