摘要
利用FDS模拟研究受限空间不同开口尺寸下的火溢流行为,并同现有的小尺寸实验结论进行对比分析。结果表明:当火灾总的热释放速率大于燃烧室内部的热释放速率时,室外可以得到稳定的火溢流现象;开口外墙有一定厚度时,通风因子较大,实际流入室内的空气质量流量基本满足理论值,通风因子较小,实际流入室内的空气质量流量损失较大,开口处燃烧行为的影响不可忽略;流入室内空气的燃烧参与率随着通风因子的增大而增大,超过一定值后基本稳定不变。模拟得到无量纲溢流火焰高度与热释放速率的关系与Lee小尺寸实验的数学模型大致吻合。
The characteristics of flame ejected from a confined space under various opening dimensions were studied by FDS,and compared with the results of previous sub-scale tests.Results showed that the phenomenon of flame ejected from compartment opening can be observed when the fire total release rate exceed the indoor heat release rate.In condition of the wall with an opening has a certain thickness,the actual mass flow of air flowing into confined space accord with theoretical value for larger value of ventilation factor,while the actual mass flow of air reduce a lot and burning behavior in opening cannot be ignored when the value of ventilation factor is small.The combustion participation rate of air flowing into confined space increase with the increase of ventilation factor,and it generally remained at a steady value when the ventilation factor exceeds a certain value.The relationship of non-dimensional facade flame height and non-dimensional flame overflow heat release rate gained by numerical simulation was grossly consist with mathematical model in Lee’s sub-scale tests.
作者
姜晓慧
朱国庆
李大燕
JIANG Xiao-hui ZHU Guo-qing LI Da-yan(Faculty of Safety Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116, China Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Jiangsu Xuzhou 221116, China Fire Research Institute, China University of Mining and Technology, Jiangsu Xuzhou 221116, China)
出处
《消防科学与技术》
CAS
北大核心
2016年第8期1058-1061,共4页
Fire Science and Technology
基金
江苏省自然科学基金项目(BK20131117)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
受限空间
开口火溢流
开口尺寸
FDS
confined space
external flames ejected from compartment opening
opening dimensions
FDS
