半圆筒状充气膜不同火灾场景下温度场分布特性  

Temperature Field Distribution Characteristics of Half Cylinder Pneumatic Membrane Structure under Different Fire Scenarios

作　　者：申跃奎[1] 王张萍[1] 彭成波 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《结构工程师》2014年第5期68-75,共8页Structural Engineers

摘　　要：利用计算流体动力学FDS软件分析不同火灾场景下充气膜结构的火灾特性,重点分析了单一火源在不同位置、风扇进气量、内压及排烟口时的膜面温度场分布。结果表明:离膜面较远的火源,其纵向温度分布较均匀,环向温度分布梯度悬殊;离膜面较近的火源,纵、环向温度分布梯度都较小,温度较为均匀。风扇打开只会显著降低风扇口处的膜面温度,对膜面整体降温效果不明显。内压对膜面温度场分布基本无影响。采用自然排烟系统时,膜面整体降温效果不佳,需采取合理的机械排烟方法。A CFD soft ware package , FDS, was used to simulate burning characteristics of air-supported structures under different types of fire scenarios .Temperature distributions on membrane surface were analyzed with factors including a single fire source located at divergent location , air supply , internal pressure and smoke vent.The results show that when the fire source is far from membrane surface , the temperature along the longi-tude direction is uniform;but when the fire source is close to membrane surface , the temperature gradient is small along both the longitude and transverse directions .When the fan is open , temperature just near the fan drops off, while the cooling effect is not prominent on all membrane surface .Internal pressure has no effect on temperature.Additionally, when the natural smoke extraction system is open , the cooling effect is poor .Me-chanical smoke exhaust systems should be used in practical engineering projects .

关 键 词：充气膜结构 数值模拟 温度场分布 

分 类 号：TU383[建筑科学—结构工程] TU998.1