Empirical Model for the Quantitative Prediction of Losses of Radial Fans based on CFD Calculations-中国Betway体育网页登陆

摘要 Inaclassicallayoutprocessofafanthequantityoflossesisestimatedasasumandexpressedintheoverallefficiencyrateη.Howeverthecharacteristicofthepressurerise,thelossesandtheefficiencyratebesidethedesignpointisnotknown.Againstthisbackgroundanumericalmodelwasdevelopedtocalculatequantitativevaluesofoccurringlossesatradialfanimpellersatanearlystageinthedesignprocess.Itallowstoestimatethepressureriseandefficiencyrateofagivenfangeometryatandbesidethedesignpoint.Thephysicsoflossesaredescribedinliterature,butobtainingquantitativevaluesisstillachallenge.Ascommoninhydraulictheorythelossesarecalculatedwithanalyticformulassupportedbycoefficientsandefficiencyrates,whichhavetobedeterminedempirically.Thispapershowsthemethodhowtodeterminethecoefficientsforagivenradialfan.Thereforearepresentativeradialfanwithbackwardcurvedbladeswasdesignedinreferencetoclassicaldesignguidelines.PerformancemeasuringwasdoneconformtoISO5801.Theflowwascalculatedat8differentoperationpointsusingCFDmethods.TheRANSequationsaresolvedbyusingtheSST-k-omegaturbulencemodel.Theflowdomainconsistsofonebladesectionincludinginletchannelandoutflowchamber.Spatialdiscretizationisdonebyablock-structuredmeshofapprox.1.8millioncells.Performancedatashowaverygoodagreementbetweenmeasurementandcalculation.

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Empirical Model for the Quantitative Prediction of Losses of Radial Fans based on CFD Calculations

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