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1、20184DesignTheoryandApplicationofOverhungTypeMultistageCentrifugalFanADissertationSubmittedfortheDegreeofMasterCandidateYangLiuSupervisorProf.ChenYangzhiSouthChinaUniversityofTechnologyGuangzhou,ChinaTH43210561201521002102/20184122018531IIIMATLABCFD-IIIAbstractCentrifugalfa
2、niswidelyusedinvariousindustries,istheimportantindustrialproductionequipment.Itoccupiesanimportantpositioninthedevelopmentofsocialproduction.Atpresent,thereisstillabiggapbetweenthedomesticandabroadonthedevelopmentofresearchlevel.Thedomesticproductionoffancannotfullymeetthep
3、roductionneedsofvariousindustries,andthelackofserializeddesigncapabilitieslimitedthedevelopmentofthefanindustry.Inordertoovercomethislimitation,thispaperstudiestheseriationdesigntheoryandapplicationofcantileveredmultistagecentrifugalfan.Thispaperhasestablishedtheseriationde
4、signtheoryandmethodforcantileveredmultistagecentrifugalfanonthebasisofpredecessors'researchresults,andcompletedthestructureparametricdesignsoftwareforthistypefan.Byanalysisthetestdata,buildalossmodelwitchisconformtotheflowcharacteristicsofthistypefan.Thelossesincludetheflow
5、lossintheimpeller,lossinthebendsandrefluxers,lossinthevolute,lossintheinletandoutletchambers,andtheimpactlossesinchangingconditions.CompiledthefanperformancepredictionsoftwareconversionbyusingMATLABsoftwareplatform,andpredictedtheperformanceofmultiplemodelsoffansintheperfor
6、mancepredictionsoftware.Thispaperhascompiledfullthree-dimensionalnumericalsimulationforthefanbyusingcommercialCFDnumericalcalculationsoftwareANSYS,anduseCFD-POSTforpost-processing,whichshowssinternalflowfieldisreasonabl.Andstudiedtheeffectofthechangeofstructuralparameterson
7、fanperformance,whichisreducingtheoutletgeometryangleoftherefluxdevicebladewillreducethepressureandpowerofthefan,anddecreasetheinletgeometryangleoftheimpellerbladewillcausethehighestefficiencypointofthefantomoveinthedirectionofsmallflowandthepressure-flowcurveofthefanwillbec
8、omemoregentle.Theseresearchresultshaspracticalguidingsignificanceforthestructurald
