摘要
为研究内含天井对高层住宅火灾中烟气流动特征,分析烟气对室外走廊以及安全疏散的影响,利用FDS建立模型,并对不同风向、风速环境条件下火灾进行数值模拟。设置二层厨房起火,分析风速0~10 m/s的情况下烟气运动、能见度分布、温度分布、毒性气体浓度分布,分析不同楼层到达危险状态的时间。结果表明:火灾产生的烟气主要通过天井有效排出,在建筑的局部区域出现部分烟气蔓延到室外走廊的现象;除与着火层相邻的三层外,各火灾场景均能满足各层人员安全疏散的性能指标;三层安全出口附近距离地面2 m高度处的烟气能见度在417~549 s时达到5 m以下,不满足人员安全疏散的性能指标;不同风向、不同风速的状况下,三层的能见度达到临界值的时间没有体现出明显差异,即风向和风速对天井内烟气流动的规律影响较小。
In order to investigate the impact of multi-story hollow space on fire smoke flow and safe evacuation in high-rise building, simulations of smoke movement under different wind direction and wind speed in case of high--rise building fire were carried out by FDS. The smoke movement, visibility distribution, temperature distribution and concentration distribution of toxic gas were ana- lyzed under the wind of 0-10 m/s. The danger times on different floors were analyzed. The results indicated that the smoke generat- ed by the fire was effectively discharged through the multi-story hollow space, and some of the smoke in the building spread to the outdoor corridor. In addition to the adjacent floor near the fire source, all fire scenes can meet the safety requirements of person nel evacuation. The time of visibility indicator at 2 m reaches a crit- ical value ranges （less than 5 m） between 417--549 s, which does not meet the requirements of evacuation. There is no statistically significant difference of the time for visibility ＇to reach the critical value under different wind directions and different wind speeds. That is, the wind direction and the wind speed have little effect on the smoke movement pattern in the multi-story hollow space.
出处
《消防科学与技术》
CAS
北大核心
2017年第11期1527-1529,共3页
Fire Science and Technology
关键词
内天井
高层住宅
火灾烟气流
数值模拟
multi story hollow space
high-rise building
fire smokeflow
numerical simulation
