Numerical Simulation On The Fire Extinguishing Process Of Water Mist

More and more casualties and economic losses are made by the fire with therapid development of economy and the increasing of population density. Therefore,the research relating to fire preventing and fire suppression is particularly important.The study found that application of water mist will quench a fire by cool theflame. This paper studies the influence of particle diameter, rate of flow and sprayangle on the flame extinction time of water mist and the temperature in the flame zonebasing on the platform of FDS software. The extinguishing time decreases with theincreasing of the water mist flow when the water mist particle size and height are thesame. The extinguishing time will be longer when the spray mean particle size and thespray angle are both small while the water mist fire extinguishing time decrease withthe decreasing of spray Angle. The study shows that the optimizing water mistparticle size is from250microns to500microns to put out the ethanol flame with thewater mist fire extinguishing system in a limited space.This paper recalculates the nozzle structure and optimizes it using the existingexperimental platform, which lead to the result that putting out the fire in a shortertime and better atomization water mist. The results show that the nozzle designed inthis paper can effectively put out diesel fire in0.5seconds in average. Using watermist with high flow will put out the fire more quickly. The water mist can put out firemore rapidly with CO2dissolved in water than without it.