摘要
本文利用火灾模拟软件FDS,以四川消防研究所高层实验塔二层为原型,建立模型研究了防烟空气幕防烟空气幕出口风速对高层建筑前室烟气运动的影响,试验中在前室内设置18个测点,测定前室内的温度、CO浓度及能见度变化情况,试验结果表明:当风速<1m/s时,前室内各测点处各参数变化情况与无风幕时基本相同,防烟效果不明显,风速>2.5m/s时,随着出口风速的增加,前室内各测点处温度、CO浓度降低,能见度增加,烟气蔓延途径由前室上部逐渐变为前室下部,且前室门处0.2m、1.25m高度处测点处各参数值瞬间波动很大,综合考虑防烟的有效性及经济性,认为防烟空气幕的最佳运行风速应为2.5m/s～3.5m/s。
To understand the influence to the effectiveness of smoke-preventing air curtain by the air outlet velocity, this paper researched the influence using the professional fire software Fire Dynamics Simulation （FDS） to simulate the second floor of fire test tower in Sichuan Fire Research Institute of MPS. The changing regulation of temperature and the smoke chemical components＇ concentration （CO） and the visibility in different positions of atria were measured. The results showed that when the velocity was less than lm/s, the effectiveness of smoke-preventing was unconspicuous, the changing law were basically the same as that of no air curtain, while when the velocity was more than 2.5m/s, the temperature and the smoke chemical components＇ concentration （CO） reduced and the visibility increased with the addition of air out- let velocity in the atria monitoring dot, and the movement way of smoke changed from upside of the atria to the underside of the atria, the monitoring dot value of each parameter on the 0.2 m, 1.25m height of the atria door fluctuated greatly. Considering the effectiveness of smoke-preventing and the economy factors, the best air outlet velocity should be 2.5 m / s - 3.5m/s.
出处
《中国安全生产科学技术》
CAS
2008年第2期31-34,共4页
Journal of Safety Science and Technology
基金
公安部部级应用创新计划项目资助(编号:2006YYCXSCHF020)
关键词
消防工程
建筑火灾
烟气流动
防烟空气幕
出口风速
数值模拟
fire fighting engineering
building fire
smoke movement
air curtain
air outlet velocity
numerical simulation
