阳台阻止火焰竖向蔓延的数值模拟  

A numerical study on the use of balconies to control vertical flame spread

作　　者：毕明树[1] 苏朗[1] 

机构地区：[1]大连理工大学化工机械学院,辽宁大连116024

出　　处：《消防科学与技术》2010年第7期565-569,共5页Fire Science and Technology

基　　金：教育部博士点基金资助项目(20090041110037);辽宁省高校重点实验室基金资助项目(20060129)

摘　　要：利用FDS软件,采用大涡模拟、混合物分数燃烧模型和欧拉-拉格朗日粒子运动描述法,对高温烟气与不同深度阳台的作用过程进行模拟,分析不同阳台深度对着火房间上两层室内温度场和CO浓度场的影响,探讨阳台的阻火机理。结果表明,增加阳台深度能够减慢热烟气的运动速度,使其散发到室外环境中的热量损失增加,同时向建筑物固体中传播的热量增加,最终降低室内热烟气层温度。由于阳台深度增加导致烟气运动速度减小,使CO气体向空气中的扩散量增加,同时CO在两层阳台之间充分混合也使得其危险值降低。Using Fire dynamics Simulation software FDS,the interaction of balconies with different depths and high temperature smoke was studied numerically by adopting Large Eddy Simulation（LES）,Mixture Fraction Combustion model and Euler-Lagrange method.Measure the temperature and CO concentration in compartments above fire room,and to explore mechanisms of balcony controlling fire and reducing the temperature and CO concentration in the compartments.Simulation results show that： The depth of the balcony greatly affects the vertical movement of fire,increasing the time of hot gas flow into the compartments due to the consumption of kinetic energy,ultimately reduce the temperature of hot smoke layers in compartments.As the depth increases,leading to the gas velocity decrease,so that increasing the amount of CO diffusion to the air,and CO mix between the two balconies reduce its dangerous value.

关 键 词：FDS 阳台 阻火 烟气 

分 类 号：X913.4[环境科学与工程—安全科学] TU972[建筑科学—建筑设计及理论]