摘要
利用FDS分别对热压单独作用和热压、风压共同作用下的中庭自然排烟进行数值模拟,对比分析按我国《高层民用建筑设计防火规范》的规定确定自然排烟窗开启面积的自然排烟和最小换气次数下的机械排烟的排烟性能,研究各工况下的中庭内烟气层高度、烟气流速、温度及烟气浓度。主导风向及主导风速对自然排烟效果影响显著。主导风速小于2.5m/s时自然排烟效果优于按最小排烟量设计的机械排烟。换气次数不小于6次/h时机械排烟有很好的排烟效果。
Atrium natural smoke extraction under only thermal pressure andthe combined effect of thermal pressure and wind pressure were studied separately using FDS. The performance under natural smoke extraction which window open area followed the requirement in the ＂Code for fire protection design of tall building＂ and mechanical smoke extraction under the minimum air change were analyzed. The height of smoke layer, smoke flow velocitie, temperature and smoke concentration under different cases were given. The dominant wind direction and wind speed affect natural smoke extraction much. Natural smoke extraction is better than mechanical smoke extraction under the minimum air change when the wind speed is lower than 2.5 m/s. Mechanical smoke extraction is effective when air change is not less than 6 times per hour.
出处
《消防科学与技术》
CAS
北大核心
2010年第8期671-675,共5页
Fire Science and Technology
关键词
中庭
自然排烟
烟气层
FDS
atriuml natural smoke extractionl smoke layer
FDS
作者简介
林俊峰（1984-），女，西安建筑科技大学环境与市政工程学院硕士研究生，主要从事大空间建筑通风与排烟技术研究，陕西省西安市雁塔路13号274信箱，710055。
