摘要
采用数值模拟的方法,结合某装配有低位排烟系统的实体小室,分析了低位排烟作用下小室火灾的发展过程。结果表明,在低位排烟模式下,烟气层高度的界面比较低,通常都处在连续火焰区;大量的空气被排烟风机从下层空气层直接抽走,使得机械排烟效率大大降低;机械排烟效率随着火源功率的增加而增加;通过模拟得到低位排烟时的平均机械排烟效率约为27.3%。
According to one real cabin with mechanical smoke exhaust at low level, numerical simulation was used to analyze the growth process of cabin fire preliminarily. Results showed, with mechanical smoke exhaust at low level, the smoke layer interface Was low, falling almost to the continuous flame region. The efficiency of mechanical smoke exhaust decreased greatly because more air was extracted directly from the lower air layer by the fan. The efficiency of mechanical smoke exhaust increased with increasing the heat release rate. The average efficiency of mechanical smoke exhaust was about 27.8% with mechanical smoke exhaust at low level.
出处
《消防科学与技术》
CAS
2008年第12期873-876,共4页
Fire Science and Technology
关键词
低位排烟
小室火灾
数值模拟
mechanical smoke exhaust at low level
cabin fire
numerical simulation
