Research on factors affecting flame suppression of external insulation system by sprinkler based on orthogonal experiments
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.
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