Numerical Simulation Of Water Mist Centrifugal Nozzle And Performance Analysis

Water mist fire suppression technology has no environmental pollution, fire extinguishing characteristics such as high efficiency, and low water consumption, in extinguishing areas to be widely used, Also it’s the industry’s frontier research subject. This paper briefly introduces the definition, the polycomponent water mist mechanism, fire into the mechanism, etc.Polycomponent water formed extinguishing nozzle is the key polycomponent water, the core components. After analyzing traditional problem like small spraying angle and bad spraying effect, New type of nozzle is designed in order to avoid the existence of low axial velocity and low pressure area at the center of the swirling jet produced by the traditional guide vane nozzle.1 share of the nozzle to nozzle cavity axial inflow generated in the direct kinetic energy of 2 shares and heads into the wall cavity 60 have a rotating tangential inflow kinetic energy The new type of nozzle employs tangential injecting and axial injecting to generate swirling flow and strengthen the impact force of the jet respectively, Can solve centrifugal nozzle of traditional rotary water jet exist some adverse effects. The problem of nozzle atomization performance. Straight hydrocyclone polycomponent water after fire sprinkler structure identification, According to experience and research and analysis, given three different exports and entrance mix than, nozzle length-diameter ratio, and then analyzes its axial velocity and radial velocity distribution, optimize sure straight hydrocyclone polycomponent water structure parameters of extinguishing shower nozzleApplying the software of FLUENT to Numerical simulation of Water mist Centrifugal nozzle,and comparing it with the result of experiment we can conclude tha Validity and Feasibility, Through the internal flow field of nozzle CFD simulation analysis, can see fluid flow in the shower nozzle of speed and track, Through external flow field of nozzle CFD simulation research and analysis in three different inlet pressure boundary conditions, analysis the speed of external spray nozzle, can see with spray pressure rise ceaselessly, the jet axial velocity is also in constant increase, straight hydrocyclone polycomponent water spray fire-extinguishing shower nozzle distance is also in constant increase. Along with the spray pressure increasing, jet radial velocity was obviously increase, be helpful for straight hydrocyclone polycomponent water spray fire-extinguishing nozzle polycomponent water expands, then the Angle of effective increase the scope of protection of polycomponent water. Along with the increase of the pressure, spray the better, but also to have certain limit, this need by further experiments to determine. Through the observation external flow field velocity vector diagram to optimize nozzle structure and analysis of the nozzle the performance. Axial with greater speed, the shows that polycomponent water spray in axial jet characteristics, thus polycomponent water the stronger the axial momentum and flow, the greater the spray injection of the farther the distance, the stronger combustibles penetrability; Radial velocity, the greater the spray hydrocyclone characteristics is stronger, polycomponent water, the greater the radial momentum and flow straight hydrocyclone polycomponent water for fire sprinkler atomization Angle, increase polycomponent water expanding coverage.May also explain much witch is hard to be observed in others’experiment result,and give a vector graph the design of Water mist Centrifugal nozzle.