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环形水气自激振荡射流频率数值分析(英文).docx

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环形水气自激振荡射流频率数值分析(英文) Title:NumericalAnalysisofFrequencyinAnnularWater-AirSelf-ExcitedOscillatingJet Abstract: Thephenomenonofannularwater-airself-excitedoscillatingjetisafascinatingareaofresearchwithapplicationsinvariousengineeringfields.Thispaperaimstoprovideadetailednumericalanalysisofthefrequencyofthisoscillatingjetphenomenon.Theanalysisinvolvesstudyingthevariousfactorsthataffectthefrequencyandinvestigatingtherelationshipbetweenthesefactorstodeterminetheoverallfrequency. 1.Introduction Theannularwater-airself-excitedoscillatingjetreferstoaflowconfigurationinwhichaconcentricannularjetofwaterissurroundedbyanannularjetofair.Thisflowexhibitsauniqueself-excitedoscillation,characterizedbyperiodicfluctuationsintheflowparameterssuchasvelocity,pressure,andfrequency.Understandingthefrequencyofthisoscillationiscrucialforoptimizingtheperformanceofvarioussystemsthatutilizethisphenomenon. 2.ExperimentalSetup Toconductthenumericalanalysis,arepresentativeexperimentalsetupisconsidered.Thissetupconsistsofanannularnozzlethroughwhichwaterflows,surroundedbyaconcentricannulusthroughwhichairflows.Theflowisdrivenbyanexternalpressuresource,andvariousmeasurementdevicesareusedtomonitortheflowvariables. 3.FactorsInfluencingFrequency 3.1.NozzleGeometry Thegeometryoftheannularnozzleplaysasignificantroleindeterminingthefrequencyoftheoscillation.Factorssuchasthediameterratiobetweenthewaterandairjets,thethicknessoftheannulargap,andtheaspectratioofthenozzleinfluencethefrequency. 3.2.MassFlowRate Themassflowratesofboththewaterandairstreamsaffectthefrequency.Highermassflowratesgenerallyresultinhigherfrequencies,whilelowerflowratesmaycausetheoscillationtocease. 3.3.ExternalPressure Theexternalpressureappliedtodrivetheflowalsoaffectsthefrequency.Increasingthepressurecanleadtoanincreaseinfrequency,butbeyondacertainlimit,itmaysuppresstheoscillation. 4.NumericalSimulation ACFD(ComputationalFluidDynamics)modelisemployedtosimulatetheannularwater-airflowandpredictthefrequencyofoscillation.Themodelsolvesthe