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1、浙江理工大學(xué)碩士學(xué)位論文電子膨脹閥節(jié)流噪聲數(shù)值模擬壓級隨開度的變化趨勢一致，表明流道形態(tài)對噪聲有重要的影響。最后，根據(jù)前文分析的結(jié)果，改變?nèi)肟趬毫?、?下游擴(kuò)口角度以及閥口長度的大小，建立不同流道結(jié)構(gòu)模型并進(jìn)行數(shù)值模擬。改變壓力項(xiàng)模擬結(jié)果顯示，隨著壓差的增大，電子膨脹閥質(zhì)量流量及湍流動(dòng)能逐漸增大，代表聲功率級逐漸增大。改變擴(kuò)口角度的數(shù)值模擬結(jié)果顯示，上游擴(kuò)口角度對噪聲的影響很大，且在所選角度研究范圍內(nèi)，入口角度為60°-70°范圍時(shí)聲功率級最?。幌掠螖U(kuò)口角度的存在可以有效降低管道內(nèi)的聲功率，而擴(kuò)口角度的大小對噪聲的影響不大。改變閥口長度的數(shù)值模擬結(jié)果顯示，噪聲
2、強(qiáng)度隨著閥口長度的改變呈周期性改變。關(guān)鍵詞：電子膨脹閥；噪聲；流動(dòng)特性；FLUENT；實(shí)驗(yàn)研究II萬方數(shù)據(jù)浙江理工大學(xué)碩士學(xué)位論文電子膨脹閥節(jié)流噪聲數(shù)值模擬ABSTRACTElectronicExpansionValve(EEV)isoneofthemostimportantcomponentsinInverterairconditioner,whoseFrequencycompressiontechnologyhaveeffectivelysavedtheair-conditioningelectricity.NotonlytheEEVforregulati
3、ngtheflowofrefrigerant,andcanaffecttheairconditioningEER.ThenoiseofEEVhasgotmoreandmoreattentioninairconditioningperformance.Inthispaper,thefluidnoiseofEEVweremeasuredundertheinverterairconditionerincoolingconditions;andestablishingathree-dimensionalmodeloftheEEV,anddevelopanumerica
4、lsimulationoftwo-phaseflowandnoisecharacteristicsoftheinterior,theworkingfluidisHFC-410A.Theresultsfortheflowchannelmodelofelectronicexpansionvalvedesignandimprovementscanplayanimportantreferencevalue.Thenumericalsimulationoftheflowfieldofelectronicexpansionvalvecanbeachievedusingth
5、ek-εturbulencemodel;thedropletevaporationandboilingmodeltodescribeandcalculatetheflashprocessqualitybetweengasandliquidinvalveportanditsdownstream;usingbroadbandnoisemodeltocalculatetheflowfieldnoise;discreteequationsusingfinitedifferencemethod;usingcoupledalgorithmpressure-velocity
6、couplingflowfield.First,createthree-dimensionalmodelswithdifferentflowchannelopeningoftheelectronicexpansionvalve,thenmeshingtothemandmakingthemesh-independentanalysis;throughthehomogenizedtoflowfieldtoobtaintheflowoftheelectronicexpansionvalveunderdifferentopening,andcomparethemtot
7、heexperimentalvalues,foundthesimulationresultsandtheexperimentalvalueofthemeasuredtrendshaveagoodagreementwithinallowableerror.Inaddition,thecomparisonofpressurecloudandvelocitycloudunderdifferentopeningwerefoundverysimilar,select0.625mmopeningdegree(i.e.100pulses)oftheflowfieldwere
8、analyzedseparately.
