电子膨胀阀节流噪声数值模拟

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1、浙江理工大学硕士学位论文电子膨胀阀节流噪声数值模拟压级随开度的变化趋势一致，表明流道形态对噪声有重要的影响。最后，根据前文分析的结果，改变入口压力、上/下游扩口角度以及阀口长度的大小，建立不同流道结构模型并进行数值模拟。改变压力项模拟结果显示，随着压差的增大，电子膨胀阀质量流量及湍流动能逐渐增大，代表声功率级逐渐增大。改变扩口角度的数值模拟结果显示，上游扩口角度对噪声的影响很大，且在所选角度研究范围内，入口角度为60°-70°范围时声功率级最小；下游扩口角度的存在可以有效降低管道内的声功率，而扩口角度的大小对噪声的影响不大。改变阀口长度的数值模拟结果显示，噪声

2、强度随着阀口长度的改变呈周期性改变。关键词：电子膨胀阀；噪声；流动特性；FLUENT；实验研究II万方数据浙江理工大学硕士学位论文电子膨胀阀节流噪声数值模拟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.