軸承腔內(nèi)油氣兩相流動與換熱特性研究.pdf

1、南京航空航天大學碩士學位論文軸承腔內(nèi)油氣兩相流動與換熱特性研究姓名：李斌申請學位級別：碩士專業(yè)：環(huán)境工程指導教師：王鎖芳201012軸承腔內(nèi)油氣兩相流動與換熱特性研究iiABSTRACTWiththewholeperfmanceofaeroengineincrementthethermalloadofbearingchamberatprincipalaxisfulcrumbecomelarge.Theheatconductedfromh

2、ightemperaturesurroundingthroughcavitywallbearingseatincreasedbesidestheheatgeneratedfromrollbearinggoseup.Manyproblemssuchasoiloverheatedoilfiredhaveoccurred.Allofthesewillaffectthewkingperfmanceofbearingreliabilityofae

3、roengine.Soitisverynecessarytoinvestigatetheairoiltwophaseflowinthebearingchambertoobtaintheruleofthemixturelubricantflowheattransferinthechamber.Basedontheanalysisofinvestigationshomeaboardanaeroenginebackfulcrumbearing

4、chamberwasstudiedthesimplifiedtestrigwasbuiltup.Theproptionofairflowthroughtheventptthetemperatureraiseofoilpumpedoutthroughthescavengechangewithdifferentrotatespeedwerefoundthroughtheexperiment.Basedonthealgebraicslipmi

5、xturemodelEulerEulermodelthecommercialcomputationalfluiddynamicssoftwareFluentisintroducedtosimulatetheairoiltwophaseflowheattransferinteatrigbearingchamber.Comparedwithtestresultsitisreliabletousethealgebraicslipmixture

6、multiphasemodelRNGturbulencemodeltosimulatethemultiphaseflow.Thismethodwasadoptedtosimulateseveralrealwkingconditioninacomplexgeometryconfigurationbearingchambertheruleofoiltemperatureriseproptionofoilpumpedoutthroughdif

7、ferentptwiththechangeofshaftrotatespeedairleakageoilsupplywereobstained.Indertomakeitsimpletousethestudiedresultcomputationalmethodabearingchamberthermalanalysissoftwarewasdeveloped.GambitFluentwereincludedinthissoftware

8、soastosimplifythedesigner’soperation.Itcanachievemanyfunctionssuchasmodelinggridgenerationfastcalculationresultsmanagement.Thefluidfilmwhichhasthesameflowdirectionwiththeshaftrotationwasfoundathighrotatespeed.BasedonS.Wi

9、tting’soilfilmmodelacomputingprogramwasdevelopedtoinvestigatetheoilfilmdepthvelocityprofile.UsingthisprogramsomewkconditionstestedbyA.Glahnwerecarriedout.Thenumericalsimulationsfitverywellwiththetestresults.Itisprovedtha

10、ttheprogramiscrectasolidfoundationwasestablishedtodevelopfurtherthemodelofoilfilmheattransfer.Theconclusioninthisthesiscanprovidetheeticstechnologyfbearingchamberthermaldesign.Keywds:bearingchamber，gasoiltwophaseflow，exp