Numerical Simulation On Fire Fluid Field Under Water Sprinkler System

Due to the increasing population and treasure in our country, the situation of fire is more and more serious. Moreover, as fire protection services for building, the sprinkler systems have been extensively used in industry and civil architectures. Lots of domestic and foreign engineering practices have also proved that these systems have high effect on fire-extinguishing and fire-controlling. Therefore, it is important to study the interaction between sprinkler and fire in a room in order to design more economical and rational method of sprinkling.Field model software - FDS and zone model software - CFAST were employed to study the problem that water sprinkling interact with fire load in a room with sprinklers. First of all, both FDS and CFAST were used in simulating the process of extinguishing fire with a sprinkler in the fire experiment room. By comparing the result of simulation with that of experiment, it was showed that the temperature and heat release rate obtained by using FDS conformed to the experimental results very well. In addition, heat release rate obtained by using CFAST accorded with the experimental results better. Furthermore, FDS was used to simulate several different situations of extinguishing fire with sprinklers caused by different sprinkler's fluxes as well as different arrangements of sprinkler and different positions of fire source in a special room. Then the relation between sprinkler flux and extinguishing time was derived in the same heat release rate. And the optimal arrangement of sprinklers was obtained in the same flux of sprinkler.The results and the conclusion gained in this paper have practical value and guiding significance on arrangement of sprinkler in a special room in the future.