摘要
TheuniqueCoandasurfacehasagreatinfluenceontheperformanceofbladelessfan.However,thereisfewstudiestoexplaintherelationshipbetweentheperformanceandCoandasurfacecurvatureatpresent.Inordertogainaqualitativeunderstandingofeffectofthecurvatureontheperformanceofbladelessfan,numericalstudiesareperformedinthispaper.Firstly,three-dimensionalnumericalsimulationisdonebyFluentsoftware.ForthepurposetoobtaindetailedinformationoftheflowfieldaroundtheCoandasurface,two-dimensionalnumericalsimulationisalsoconducted.FivetypesofCoandasurfaceswithdifferentcurvaturearedesigned,andtheflowbehaviourandtheperformanceofthemareanalyzedandcomparedwiththoseoftheprototype.TheanalysisindicatesthatthecurvatureofCoandasurfaceisstronglyrelatedtoblowingperformance,ItisfoundthatthereisanoptimalcurvatureofCoandasurfacesamongthestudiedmodels.Simulationresultshowsthatthereisaspeciallowpressureregion.WithincreasingcurvatureinYdirection,severallowpressureregionsgraduallyenlarged,thenbegintomergeslowly,andfinallyformalargeareaoflowpressure.Fromtheanalysesofstreamlinesandvelocityangle,itisfoundthatthemagnitudeofthecurvatureaffectstheflowdirectionandreasonablecurvaturecaninducefluidflowclosetothewall.Thus,itleadstothatthecurvatureofthestreamlinesisconsistentwiththatofCoandasurface.Meanwhile,italsocausesthefluidmovementtowardsthemostsuitabledirection.Thisstudywillprovideusefulinformationtoperformanceimprovementsofbladelessfans.
出版日期
2014年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
