摘要
为研究水喷淋参数对外墙外保温系统火焰蔓延抑制效果的影响,基于GB/T 29416-2012《建筑外墙外保温系统的防火性能试验方法》建立了窗口火试验的FDS火灾动力学模拟模型.通过正交试验方法研究了喷头流量、水平角度、垂直角度及液滴粒径等 4个水喷淋参数对其控火效果的影响,应用极差分析和方差分析得到了最优的参数组合,并将最优参数与无喷淋的情况进行了对比.研究表明,合适的水喷淋参数对于灭火效能尤为重要;随着喷头流量增加,外保温系统的峰值热释放速率逐渐降低;当喷头流量为140 L/min、水平角度和垂直角度为140°、液滴粒径为0.5 mm时,水喷淋的控火效率最高.
Abstract
The parameter setting of water sprinkler has a signifi-cant effect on the fire control effectiveness,but due to the large number of setting parameters,the method of numerical simulation is the most convenient and efficient.In order to study the influ-ence of water sprinkler parameters on the flame spread suppres-sion effect of external wall insulation system,this paper estab-lishes a fire dynamics simulation model for the window fire test based on the GB/T 29416-2012,Test method for fire-resistant performance of external wall insulation systems applied to build-ing facade.The effects of four water sprinkler parameters,namely,spray flow rate,horizontal angle,vertical angle and droplet size,on the fire control effect were investigated by or-thogonal experiments,and the optimal parameter combinations were obtained by applying the extreme difference analysis and analysis of variance,and the optimal parameters were compared with the case of no sprinkler.The study shows that the appropri-ate water sprinkler parameters are particularly important for its fire extinguishing efficiency;with the increase of spray flow rate,the peak heat release rate of the exterior insulation system gradu-ally decreases;when the spray flow rate is 140 L/min,the hori-zontal and vertical angles are 140°,and the droplet size is 0.5 mm,the fire control efficiency of sprinkler is the best.
NETL
NSTL
维普
万方数据