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1、华中科技大学硕士学位论文离心压缩机级的数值模拟及结构参数影响分析姓名：方立宏申请学位级别：硕士专业：流体机械及工程指导教师：蔡兆麟20060429华中科技大学硕士学位论文AbstractCentrifugalcompressorhasawideapplicationbecauseitfitsvariousneedsofgas-compressinginindustrial.Withitsdevelopinginthedirectionofhighload,highefficiency,lownoise,lowvolumeandsoon,c
2、entrifugalcompressorneedsmorestrictresearchfordesign.Basedonthedemand,3DflowfieldinsideacentrifugalcompressorstageisanalyzedutilizingCFDinthispaper.Firstly,thestructureofCFDandtheprocessofsimulationisinterpreted.AndcombiningwithFLUENTsoftware,thegovernequations,turbulence
3、models,methodsofdiscretization,discretizationschemsandsolutionsofdiscreteequations,whichareusedinsimulationsofflowfieldinturbomachinery,areanalyzed.Secondly,acentrifugalcompressorstageisdesignedbasedon1Dmethodand3DflowfieldinsidethestageissimulatedusingFLUENTsoftware.Thei
4、mpellerandthereturnchannelareemphasized.Afterthesimulation,someconclusionsaregot.Fortheimpeller,largeinletcurvatureradiusofshroudcanenhancetheperformanceofstageinsomedegree;appropriatenegativeangleofattackcangetgoodperformancefor2Dimpeller;Comparingwith2Dimpeller,3Dimpell
5、ercanenhancetheperformanceremarkableandtheoptimumworkconditionof3Dimpellermovesinthedirectionoflargerfluxandlargerpressureratio.Forreturnchannel,inletangleofbladehasaremarkableimpactontheperformance,and0°angleofattackcangetgoodperformance;bladestylehasamanifestimpactonthe
6、performance,andthebladeofvariablewidthisbetterthanthatofconstantwidth.Sequently,3DflowfieldsofsomenormalductfittingsaresimulatedutilizingFLUENT.Loss-coefficientsofthesefittingsaregenerated.Comparingthedatasimulatedwiththecoefficientsinhandbook,itshowsthatCFDcancomputeflow
7、resistanceinductfittingspreciselyinsomeinstances.Finally,combinedtheapplicationofCFDincentrifugalcompressorandtheexperienceinnumericalsimulation,somekeytechnologiesaresummarized.Keywords:Centrifugalcompressor,Numericalsimulation,3Dflowfield,FlowresistanceII独创性声明本人声明所呈交的学位
8、论文是本人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除了文中特别加以标注和致谢中所罗列的内容以外，论文中不包含其他个人或集体己经发表或撰写过的研究成果。对本文研究做出贡献的个人和集
