Wind effects on smoke motion and temperature of ventilation-controlled fire in a two-vent compartment
Wind effects on smoke motion and temperature of ventilation-controlled fire in a two-vent compartment
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DOI：
10.1016/j.buildenv.2009.04.008
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发表时间：
2009-12
影响因子：
7.4
通讯作者：
Haixiang Chen;Naian Liu;W. Chow
中科院分区：
文献类型：
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作者：
Haixiang Chen;Naian Liu;W. Chow
高层建筑火灾往往受到环境风的影响。研究风环境下高层建筑室内火灾行为，探索有效的室内火灾烟气运动评价和控制方法是十分必要的。本文研究了高空环境风吹向通风口时，双通风口房间内通风控制火灾烟气流动方向和温度的变化规律。研究发现，存在一个临界风速，在此风速以上，烟气的运动方向主要由风而不是浮力决定。环境风对车厢内烟气温度的影响较为复杂。当风速超过另一个临界值时，烟气温升曲线只出现一个稳态。否则出现三个稳定状态。室内壁面传热对第二临界风速有很大影响。
High-rise building fire is often influenced by the ambient wind. Study concerning fire behavior in the compartment of high-rise buildings in wind environment is needed for exploring some effective methods used for evaluation of compartment fire smoke movement and control. In this paper, smoke flowing direction and temperature of ventilation-controlled fire in a two-vent compartment are studied when ambient wind blows to the vent at higher altitude. It is found that there is a critical wind speed, above which the direction of smoke movement is dominated by wind rather than by buoyancy. It is also found that ambient wind has a complex influence on smoke temperature in the compartment. When wind speed exceeds another critical value, only one steady state appears in the smoke temperature rising curve. Otherwise three steady states appear. Heat transfer through the compartment walls has great influence on the second critical wind speed.