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大涡模拟的蒸汽截止阀流致噪声数值研究(英文).docx

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大涡模拟的蒸汽截止阀流致噪声数值研究(英文) NumericalStudyofSteam-inducedNoiseinGlobeValveswithLargeEddySimulation Abstract: Globevalvesarewidelyusedinindustrytocontroltheflowoffluids.However,thehighpressuredropacrossthevalvecancausenoiseandvibration.Inthisstudy,largeeddysimulation(LES)wasemployedtoinvestigatesteam-inducednoiseinaglobevalve.Theresultsshowthatthevalveclosurepositionhasasignificanteffectontheacousticcharacteristicsofthevalve.Furthermore,theresultsrevealtheimportanceofconsideringtheunsteadyturbulentflowwhenanalyzingthesourceofvalve-inducednoise. Introduction: Globevalvesarecommonlyusedinindustrialapplicationstoregulatetheflowoffluids.However,thehighpressuredropcausedbythevalvecancausenoiseandvibration,whichisapotentialprobleminsomeindustries.Steam-inducednoiseinglobevalvesisacomplexproblemduetothetwo-phaseflowthatoccursinthevalve.Directnumericalsimulation(DNS)isapowerfultoolforstudyingtwo-phaseflow,butitscomputationalcostisprohibitiveforpracticalapplications.Therefore,largeeddysimulation(LES)isoftenemployedtosimulateturbulentflowsinindustrialapplications.ThegoalofthisstudywastouseLEStoinvestigatetheacousticcharacteristicsofaglobevalveundersteam-inducedflow. Methodology: Theglobevalvemodelusedinthisstudywasastraight-throughglobevalve,whichiscommonlyusedinindustrialapplications.Asinglephasefield-coupledsolverwasusedtosimulatethesteamflowwiththesteammass-flowrateof300kg/hr.Theclosurepositionofthevalvewasvariedtoinvestigateitseffectonvalve-inducednoise.Thesoundpressurelevel(SPL)wasmeasuredatdifferentpositionsdownstreamofthevalvetoanalyzetheacousticcharacteristicsofthevalve. Results: Theresultsshowthatthevalveclosurepositionhasasignificanteffectontheacousticcharacteristicsofthevalve.Whenthevalveispartiallyopen,theturbulenceinthevalvegenerateshigh-frequencynoise.Asthevalveisclosed,thenoiseleveldecreases,butthefrequencyofthenoiseshiftstolowerfrequencies.Furthermore,theresultsshowthatconsideringtheunsteadyturbulentflowwhenanalyzingthesourceofvalve-inducednoiseisimportant.Theuseofs