摘要
临界水流率是细水雾系统的重要设计参数.为了研究通风条件对细水雾灭火临界水流率的影响,开展了一系列细水雾熄灭木垛火的模拟实验.实验结果表明,对于木垛火,细水雾的临界水流率同时受到热释放速率、有效喷嘴直径、高度、风速和雾化锥角的影响.基于Heskestad的临界水流率预测模型,利用量纲分析得到的指数关系式对实验数据进行拟合,对纳入通风风速后的模型各参数指数进行了修正,从而将其拓展至通风条件下.
Critical flow rate, one of the important design parameters of water mist system, is likely to be affected by ventilation. To study the influence laws, simulative experiments of wood crib fire extinguishment by water mist were performed. The experimental results showed that critical flow rate of water mist was affected by heat release rate, effective nozzle diameter, height, wind velocity and spray angle. Based on the prediction model of critical flow rate presented by Heskestad, the experimental data were fitted by exponential equations. The parameter exponents were modified for the model, in which wind velocity was taken into account, and the prediction model was then extended for ventilation conditions.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第5期412-416,共5页
Journal of Combustion Science and Technology
基金
北京市科技新星计划资助项目(2007-B-041)
关键词
灭火
细水雾
通风
水流率
fire extinguishment
water mist
ventilation
flow rate
