高层建筑火灾时排烟速率对排烟效果影响的数值模拟  

Numerical Simulation on Smoke Exhaust Effect by Different Smoke Exhaust Rates in High-rise Building Fires

作　　者：许小磊[1,2] 何嘉鹏[1,2] 周汝[1,2] 李静娴[1,2] 

机构地区：[1]南京工业大学城市建设与安全工程学院,南京210009 [2]江苏省城市与工业安全重点实验室,南京210009

出　　处：《工业安全与环保》2010年第11期35-37,共3页Industrial Safety and Environmental Protection

基　　金：江苏省自然科学基金项目(BK2008369)

摘　　要：对比分析了不同排烟速率情况下,高层建筑内烟气的扩散、走廊内温度的变化和排烟口下方烟气层厚度的变化情况。结果表明,高层建筑走廊机械排烟时,排烟速率对排烟效果影响很大。当前《高层民用建筑设计防火规范》中"排烟口的风速不宜大于10 m/s"的规定不太合理。高层建筑走廊机械排烟设计时,应根据性能化防火设计思想,取得合理的排烟速率,保证排烟口的控制距离小于烟气界面层厚度。Comparative analysis are made on smoke diffusion,temperature variation and the changing of smoke layer depth under smoke vent,when smoke exhaust rates are different.The results show that different smoke exhaust rates have great influence on smoke exhaust effect.In Code for Fire Protection Design of Tall Buildings,the criterion ＇the air speed at smoke vent shouldn＇t be more than 10m/s＇isn＇t reasonable.When making smoke exhaust design for high-rise building corridor,a reasonable smoke exhaust rate should be taken,to ensure that the controlling distance of smoke vent is less than the smoke layer depth,by concept of performance-based fire protection design.

关 键 词：高层建筑 烟气扩散 排烟速率 烟气层厚度 数值模拟 

分 类 号：TU972.4[建筑科学—建筑设计及理论]