Fire spill plume from a compartment with dual symmetric openings under cross wind
Fire spill plume from a compartment with dual symmetric openings under cross wind
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侧风下具有双对称开口的隔间的火灾溢出羽流
DOI：
10.1016/j.combustflame.2016.01.011
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发表时间：
2016-05
影响因子：
4.4
通讯作者：
Zhang Linhe
中科院分区：
文献类型：
--
作者：
Gao Wei;Liu Naian;Delichatsios Michael;Yuan Xieshang;Bai Yueling;Chen Haixiang;Zhang Linhe
本文对侧风作用下双对称开口舱室火灾溢油羽流进行了理论和实验研究。在风洞出口处进行了溢流羽流实验，实验室尺寸为实验室尺寸，具有背风面和双对称开口。实验的防火隔间是混合的。通过对内外压差的推导，从理论上阐明了风的作用。从理论上推导了两种开孔情况下的中性面，并与单开孔和无风情况下的中性面进行了比较。利用视频图像分析和速度数据回归分析对中性面高度公式进行了验证。提出了一种利用无风情况下的风速和中性面高度数据确定高风速下中性面高度的新方法。结果表明，中性面高度随侧风风速单调变化。通过理论推导，提出了两种新的中性面高度可变的长度尺度，用于建立溢油羽流的尺度模型。结果表明，新的长度尺度适用于关联轴向羽流温度和沿立面沿着的总热通量。溢出羽流的径向温度分布可以用温度半径归一化的高斯函数来描述，而温度半径与风速无关。结果表明，风在近场和远场均增强了溢油羽流的卷吸作用，从而加速了连续火焰、间歇火焰向浮力羽流的转变。总热通量和立面沿着温度分布的数据表明，侧风对溢油羽流向立面的热传输有两种相互竞争的影响。
This paper presents a comprehensive theoretical and experimental study on the fire spill plume from a compartment with dual symmetric openings under cross wind. Experiments of spill plume were performed at the outlet of a wind tunnel using a bench-scale compartment with a leeward façade wall and dual symmetric openings. The experimental fire compartment was well-mixed. The effect of wind is theoretically elucidated by derivations on the pressure differences between inside and outside. The neutral planes for the two openings are theoretically formulated and compared with those in single-opening and no-wind case. The formulations of the neutral plane heights are verified by using video image analysis and velocity data regression analysis. Also a new method using the data of wind speed and neutral plane height in no-wind case is proposed to determine the neutral plane heights for higher wind speeds. The results suggest that the neutral plane heights vary monotonically with cross wind speed. Two new length scales with variable neutral plane heights are proposed by theoretical derivations to develop scaling models of spill plume. It is indicated that the new length scales are applicable to correlate the axial plume temperature and the total heat flux along the façade. The radial temperature profiles of spill plumes are well described by a Gaussian function normalized by the temperature radius, which is independent on the wind speed. It is found that wind enhances the air entrainment of spill plume in both the near and far fields, thereby the transition from continuous flame, intermittent flame to buoyant plume is accelerated. The data of total heat flux and temperature distribution along the façade indicate that cross-wind has two competitive effects on the heat transportation from the spill plume to the façade.
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影响因子：
7.4
作者：
Haixiang Chen;Naian Liu;W. Chow
通讯作者：
Haixiang Chen;Naian Liu;W. Chow
DOI：
10.1016/s0082-0784(82)80267-1
发表时间：
1982-09
期刊：
--
影响因子：
--
作者：
K. Steckler;J. Quintiere;W. Rinkinen
通讯作者：
K. Steckler;J. Quintiere;W. Rinkinen
影响因子：
1.9
作者：
Rajiv Kumar;M. Naveen
通讯作者：
Rajiv Kumar;M. Naveen
DOI：
10.1016/s0082-0784(98)80132-x
发表时间：
1998
期刊：
--
影响因子：
--
作者：
J. Quintiere;B. S. Grove
通讯作者：
J. Quintiere;B. S. Grove
DOI：
10.3801/iafss.fss.9-907
发表时间：
2008
期刊：
Fire Safety Science
影响因子：
--
作者：
Haixiang Chen;Naian Liu;Linhe Zhang;Zhihua Deng;Hong Huang
通讯作者：
Haixiang Chen;Naian Liu;Linhe Zhang;Zhihua Deng;Hong Huang