Experimental Study on Cross-ventilation Compartment Fire in the Wind Environment
Experimental Study on Cross-ventilation Compartment Fire in the Wind Environment
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DOI：
10.3801/iafss.fss.9-907
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Haixiang Chen;Naian Liu;Linhe Zhang;Zhihua Deng;Hong Huang
中科院分区：
文献类型：
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作者：
Haixiang Chen;Naian Liu;Linhe Zhang;Zhihua Deng;Hong Huang
高层建筑房间发生火灾时，强烈的环境风对火灾的蔓延和烟雾的运动行为会起到重要作用。然而，到目前为止，风对交叉通风条件下室内火灾的影响还没有得到充分的研究。本文通过实验研究，对风环境下的通风隔室火灾进行了研究。实验用250毫升(10 cm×10 cm托盘燃烧器)或500毫升(20 cm×20 cm托盘燃烧器)正庚烷在立方围墙的地板上产生火灾，墙壁上有两个相对的通风口。用两个热电偶矩阵记录了不同竖直和水平位置的室内和室外气体温度分布。将环境风速设置为零、1.5m/S和3m/S，观察到环境风对车厢火灾有两个矛盾的影响：通过增加供氧来增加火灾的严重性，通过散热和可燃气体的稀释来冷却火灾。随着风速的增加，喷出的火焰/羽流向水平方向延伸得更远。结果表明，燃料量为500毫升的室内火灾达到闪络后阶段，而燃料量为250毫升的燃烧室火灾没有达到闪络后阶段，在较大的火灾中，风的影响明显，而在较小的火灾中，风的影响不明显。
When fire occurs in the rooms of high-rise buildings, the strong ambient wind will play an important role in fire spread and smoke movement behavior. However, wind effect on compartment fire in cross ventilation condition has not been fully studied so far. In the present study, an effort has been made to study crossventilation compartment fire in the wind environment through experimental investigations. The experimental fire was generated by 250ml (10cm×10cm tray burner) or 500ml (20cm×20cm tray burner) nheptane on the floor of a cube enclosure with two opposite vents on the walls. The inside and outside gas temperature profiles at different vertical and horizontal locations were recorded by two thermocouple matrixes. The ambient wind velocity was set to zero, 1.5m/s and 3m/s. It is observed that the ambient wind has two contradictory effects on the compartment fire: promoting fire severity by more oxygen supplying and cooling the fire by heat removing and combustible gases diluting. The spilled-out flame/plume extends horizontally farther with the increase of wind speed. It is found that the compartment fire with 500ml fuel reaches post-flashover stage while that with 250ml doesn’t. The wind effect is obviously observed in larger fires while not significant in smaller fires.