瘦高中庭羽流上升及排烟口布置的研究

Study on the plum rise and smoke vent layout in thin tall atrium buildings

为研究瘦高中庭建筑火灾独特的烟气流动特点及机械排烟对烟气的影响,采用全尺寸热烟实验及FDS数值模拟的方法,采集并整理了在无排烟系统影响下羽流的上升高度、羽流中心线温度数据,并与经典羽流模型及相关公式进行对比分析,研究了瘦高中庭内火灾烟气羽流的上升特点及排烟口布置方式对瘦高中庭机械排烟效果的影响。结果表明,Mc Caffrey模型适用于描述瘦高中庭羽流中心线温度,修正后的Zukoski模型适用于描述羽流上升时间与高度的关系;当排烟口总面积相等时,分设4个排烟口的排烟方式优于1~2个排烟口。

In order to study the unique characteristics of smoke flow and the effect of mechanical smoke on smoke in thin tall atrium building fires,full-scale hot smoke experiment and FDS were used.The plum rise height,plum center line temperature in the condition of no smoke exhausting system were collected and com-pared with typical plum model and related formulas.The rising characteristics of the smoke plume and the influence of smoking vents location to the smoke exhausting in thin tall atrium were stud-ied.The results showed that the McCaffrey model is suitable for describing the centerline temperature of plumes in thin tall atrium buildings,and the modified Zukoski model is suitable for describ-ing the relationship between plume rise time and height;when the total area of exhaust outlets is the same,four exhaust outlets are better than one or two exhaust outlets.