摘要
为了了解典型建筑保温热塑性材料烟气迁移特性,采用接近ISO9705标准房的1/3大小的试验体系对建筑保温热塑性材料(主要研究聚苯乙烯烟气迁移特性)燃烧产生的烟气中的CO进行实时的在线检测并且与FDS软件模拟的相关结果进行比较。考虑从燃烧腔体流出的高温烟气与流入走廊腔体内的空气进行隔离对燃烧腔体内CO峰值的影响,实验在整个走廊腔体内设置了一个可上下移动的挡板以隔绝走廊腔体内空气与高温气体的接触。实验及模拟结果均表明,走廊腔体内设置挡板时燃烧腔体内CO峰值明显低于走廊腔体未设置挡板时燃烧腔体内CO峰值。
The flow and heat transfer characteristics of delta wing fins using 5mm tube diameter was studied based on three-dimensional numerical simulation, the influence of the delta wing upon the flow fluid and heat transfer and enhanced heat transfer mechanism were discussed and analyzed. The computational results show that the flow field has three significant characteristics： the air above and below the fin circulate through the hole punched,a visible longitudinal vortex arises after the delta wing,the transverse flow appears at the rear of the delta wing. Compared to the plate fin, the heat transfer and overall performance are increased by 70 %-80 % and 19 %-38 M, respectively. Meanwhile, the average field synergy angle decreases. It means that the delta-wing longitudinal vortex generators can improve the synergy of the temperature and velocity field, thus strengthen the heat transfer.
出处
《热科学与技术》
CAS
CSCD
北大核心
2012年第4期358-362,共5页
Journal of Thermal Science and Technology
基金
国家重点基础研究发展计划资助项目(2012CB719704)
关键词
烟气迁移
水平挡板
燃烧腔体
CO
smoke effluent migration
horizontal partition
combustion room
CO
