Modeling and Analysis of Key Factors Influencing Water Mist Fire Suppression Efficiency

Existing experimental results are sometimes difficult to guide the design of a water mist fire extinguishing system ascribing to many factors that affect the fire extinguishing per-formance of water mist. This paper sums up the factors and combs the logical relation-ships between them based on fire extinguishing mechanism of water mist and existing literature. Direct influence factors on fire extinguishing performance are analyzed em-phatically by the model of movement, heat transfer and mass transfer of water mist in the flame zone. The results show that the velocity and diameter of water mist entering the flame zone can be determined according to the temperature difference and the height of flame without considering the action of the flame plume. The water mist will enter the flame zone from the top and the periphery of the flame when the plume effect cannot be ignored. And the maximum heat absorption power of the water mist entering through the two ways should be obtained when determining the velocity and diameter of the water mist. This research can serve as a theoretical basis for the design of a water mist fire ex-tinguishing system.