Numerical Simulation Study On Fire Performance Of Indoor High Pressure Pulse Water Mist

This paper focuses on the subject of numerical simulation of indoor pulsed water mist fire extinguishing performance,and conducts conventional water mist fire extinguishing experiments around the laboratory’s high-pressure water mist system.At the same time,the fire source power of oil pools with different sizes is measured,and the fire extinguishing time and fire source temperature changes of different power fire sources under the action of conventional water mist are investigated.At the same time,the method of numerical simulation is combined and compared with experimental data.However,through research,the reliability of numerical simulation method for studying the fire extinguishing performance of water mist is found.After verifying the reliability of the numerical simulation method,the fire extinguishing process of pulse water mist was numerically simulated by using PyroSim software,and the specific fire extinguishing performance of pulse water mist was obtained by studying the changes of fire temperature,carbon monoxide,oxygen,water vapor concentration and other different factors and the differences of fire extinguishing time under various working conditions with different starting and stopping times and different fire power.In the simulation,compared with the conventional continuous water mist,the pulse water mist has a higher extinguishing efficiency,which is 30% to 40% shorter than the continuous water mist.At the same time,for the droplets of pulse water mist,the evaporation of water mist is more sufficient.In the presence of natural ventilation,its main extinguishing mechanism is cooling.The large amount of evaporation and heat absorption of water mist particles effectively reduces the ambient temperature around the fire source,which plays a key role in extinguishing the fire.After simulating all working conditions,it is found that when the pulse frequency of 8 seconds on and 8 seconds off is used,the fire extinguishing time is the shortest.For fires with different fire source powers,pulse water mist can be effectively extinguished,and the extinguishing efficiency is higher for high-power fire sources.Figure[57] table[8] reference[64].