Numerical study of the effect of the water mist nozzle location on fire extinguishing system in shielded fire

When the fire is placed in the compartment, problems such as lack of access to the fire and lack of settling of spray particles lead to a delay in extinguishing the flame. Therefore, in this research, the growth and spread of the fire and its extinguishing with the water mist system with the effectiveness of the position of the nozzle in the shielded fire have been done using numerical study. The location of the effect of the water mist fire extinguishing system nozzle has been investigated under five case of four sides, central and one side, central and four sides, one side and central. The geometry of the research is a compartment without a roof and there is no door or window in the walls. The fuel source is located in the center of the compartment and there is a plate in the center of the room as a fire shield (protected fire plate) with a height of 50 cm from the floor of the room (on the fire). According to the results, it was found that the three cases of four sides, central mode and one side, and central mode and four sides respectively are the best modes for extinguishing the shielded fire, which extinguishes the fire after 22 seconds. In general, it can be said that the central and one-sided case with less number of nozzles can have the best performance.