摘要
为了掌握建筑中庭底部发生火灾时,不同机械送风方式对热烟气运动规律与排烟效率的影响,从而为中庭防排烟设计提供参考,利用大涡模拟(LES)数值方法对某商场内的中庭式建筑空间4种机械送风方案对火灾产生的热烟气流场作用效果进行了模拟.通过对结果比较分析后得到,单纯采用侧送风方式会扰乱热烟气,并会加剧烟气向周围平台的扩散和烟气层的下沉;底部采用上送风方式时虽然会在一定程度上缓解烟气层高度的降低,但不能防止烟气在中庭上部分向周围平台的扩散;而采用上送风和侧送风相结合、多个送风口分布的方式不仅能够减缓烟气层高度的下降,同时还可以有效防止烟气向周围平台的扩散,是比较适用于中庭的一种送风方案.
To identify various effects of mechanical ventilations on the smoke spread in case of a fire,and provide reference for smoke control design in the atrium building,several scenarios of a fire at the bottom of an atrium were numerically simulated by large eddy simulation（LES）.By comparing and analysis,the first way,later air supply,can disturb the smoke,consequently the smoke spread is intensified to move to the platform;and the smoke interface height decreases;the second way,upward air supply,can slow down the smoke falling in some extent;but can not prevent the smoke spread to the platform;the third way,many air supply outlets with lateral air supply and upward air supply unified,are applied;so that the smoke interface height can slow down;and the smoke spread to the platform can be prevented effectively.Accordingly,it is suggested that the way of many air supply outlets with lateral air supply and upward air supply is suitable in the atrium.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2010年第4期490-493,共4页
Engineering Journal of Wuhan University
关键词
中庭
排烟
数值模拟
atrium
smoke exhaust
numerical simulation
