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1、西北工業(yè)大學(xué)碩士學(xué)位論文II萬方數(shù)據(jù)ABSTRACTABSTRACTCentrifugalfansarewidelyusedinnationaldefenseandindustry.Itplaysanimportantroleinthenationaleconomyanddailylife.So,studyingandoptimizingthecentrifugalfancanoptimizetheenergydistributionandreducetheemissions.Inthispapertheresearchwasinstitutedunderaresearchproje
2、ctoftheCSIC.Thenumericalsimulationwasusedtostudyamarine'scentrifugalfan,andtheresultswerecomparedwiththeexperiment.Thentheaerodynamicperformanceoftheimpellerandvolutewasoptimized.Theworksweremainlydoneinthefollowingaspects:（1）Numericalsimulationontheoriginalcentrifugalfan.Theoriginalfan'sstruct
3、ureandexperimentsystemwereintroduced.Thenthegrids'divisionandnumericalcalculation'ssettingsweredone,andthesimulationresultswerecomparedwithexperimenttobeverified.Sothemainfeaturesoftheoriginalfan'sflowfieldwereanalyzedandthecalculationresultsindicatethattheaerodynamicperformanceisnotwellandthef
4、lowseparationintheimpellerisveryserious.（2）Optimizationdesignof2Dblade.Inordertoimprovetheaerodynamicperformanceoftheoriginalcentrifugalimpeller,adesignmethodof2Dbladeprofileontheimpellerhasbeenproposed.Andthebestefficiencyoftheimpellerwasselectedthroughnumericalsimulation.Thenumericalresultssh
5、owthattheefficiencyandtotalpressureriseoftheimpeller,whichisobtainedthroughthismethod,aregreatlyimproved.Andthewholefan'sefficiencyisalsoimprovedgreatly.Theanalysisofflowfieldshowsthattheflowseparationin2D-optimizedimpellerisgreatlyweakenedandtheflowfieldisoptimized.（3）3Dbladeoptimizedexplorati
6、on.Onthebasisofthe2Dbladedesign,the3Dbladewasexplored.The3Dbladeexplorationmainlyconsistsoftwoaspects,namely3Dbladeprofileoptimizationandthestackingline'ssweepandlean.The3Dbladeprofilewasoptimizedwiththeoptimizationobjectivesoftheimpeller'sefficiencyandtotalpressurerise.Theresultsshowthatthe3Db
7、lademakestheperformancesofeithertheimpellerorthewholefanisgreatlyimproved.Stackinglineexplorationshowsthatleanbladesandsweptbladeshaveasignificantimpactonthecentrifugalfan'sperformance,andtheimpactofthecombinedbladeisnotasimplesup
