Experimental investigation on the characteristics of buoyant plume movement in a stairwell with multiple openings
Experimental investigation on the characteristics of buoyant plume movement in a stairwell with multiple openings
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DOI：
10.1016/j.enbuild.2013.09.028
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发表时间：
2014-01-01
影响因子：
6.7
通讯作者：
Shi, W. X.
中科院分区：
文献类型：
--
作者：
Li, L. J.;Ji, J.;Shi, W. X.
在1/3比例的楼梯间内进行了一组燃烧实验，研究了12层楼梯间内火灾引起的浮力羽流运动特性。结果表明：稳态时，楼梯间内烟羽温度随高度的增加而降低，楼梯间内烟羽温度的分布主要取决于火源的热释放速率。通过测量中间开孔处的温度场和速度场的变化趋势来确定中性面的位置，并通过流场照片（激光片照明）验证了中性面位置的确定。根据楼梯间的温度分布和理论分析，计算了楼梯间中性面的位置，计算结果与实验结果吻合较好。中性面的位置主要受中间开口高度的影响。对于相同中间开度的情况，火源热释放速率对中性面位置的影响较小。根据实验结果，得到了三开口楼梯间的流量系数为0.41。(C)2013爱思唯尔有限公司版权所有。
A set of burning experiments were conducted in a 1/3 scale stairwell to investigate the characteristics of fire induced buoyant plume movement in a 12-storey stairwell with three vents. Results show that the temperature of fire plume generally decreases with height in the stairwell on the steady state, and the distribution of smoke temperature in stairwell is mainly determined by the heat release rate (HRR) of fire source. The variation trends of temperature and velocity profiles measured at the middle opening were used to determine the location of neutral plane, and the determined results were confirmed by the pictures of flow field (lightened by the laser sheet). Based on the temperature distribution in stairwell and theoretical analysis, the location of neutral plane in the stairwell was calculated and the results were in good agreements with experimental results. The location of the neutral plane was mainly affected by the height of the middle opening. For cases with the same middle opening, the heat release rate of fire source weakly affected the location of neutral plane. Based on experimental results, the discharge coefficient of the stairwell with three openings (0.41) was obtained. (C) 2013 Elsevier B.V. All rights reserved.