摘要
通过小尺寸楼梯井火灾烟气实验,研究了楼梯井顶层通风口开闭状态、着火房间补风口面积、油盆到楼梯井中心线的距离对楼梯井顶部温度分布的影响,以及着火房间补风口的气体流动情况.选取油盆中心到楼梯井中心线的距离为特征长度,根据理论推导公式和实验数据,对楼梯井内羽流前锋的上升速度进行了研究.结果表明,在封闭楼梯井中,羽流上升时间与高度的1.298次方成正比,在开放楼梯井中,羽流上升时间与高度的0.784,5次方成正比.
In this paper, to study the smoke movement in a stairwell, a set of experiments were conducted by vary- ing the pool size, top vent state, bottom vent size and oil pan position in a 1/3 scaled 12-layer-stairwell building model. The influence of stack effect on the top vent temperature and air flow state through bottom vent was discussed. In addition, the rising characteristics of fire-induced buoyant plumes in stairwells were also investigated. Results show that the time for the front of a buoyant plume to reach a given height from a fire source is inversely proportional to the 1/3 power of the heat release rate, but proportional to the 0.7845 and 1.298 power of the height in the stairwell with top vent open and closed, respectively.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2013年第5期464-472,共9页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973计划)资助项目(2012
CB719704)
中央高校基本科研业务费专项基金资助项目(WK2320000014)
关键词
高层建筑
楼梯井
烟气羽流
烟囱效应
high-rise building
stairwell
smoke plume
stack effect
