轉(zhuǎn)子-軸承-密封系統(tǒng)非線性氣流激振數(shù)值研究.pdf

1、大連理工大學碩士學位論文轉(zhuǎn)子軸承密封系統(tǒng)非線性氣流激振數(shù)值研究姓名：王曉艷申請學位級別：碩士專業(yè)：動力學與控制指導教師：王躍方20071201轉(zhuǎn)子一軸承一密封系統(tǒng)非線性氣流激振數(shù)值研究NumericalStudyonNonlinearAerodynamicExcitationofRotorBearing—SealingSystemsAbstractMuszymkasealingforcemodeliswidelyusedOtherwis

2、e，somesealingforceparametersofthemodelareusuallyobtainedbyexperienceInadditionthestudiesarcalwaysdevelopedunderaCeltaillgroupofparametersThesealingparameterscall’tbedecidedonconcretesealingstructureRotorbestingsealingsys

3、temisatypicallynonlinearsystemAtpresent，theestablishedcalculationmodelhasn’tcompletelyseizethemultitoothunsteadycharactersoflabyrinthsealundermulticonditionTheestablishedmodelismainlyforsingletoothcavityandhaan’teomidere

4、dtheeffectofunsteadyfactorincalculatiomThispaperstudiesrotorbearingsealingsystemofthelargeRotorVibrationTestDeskwhichaimstoresearchthevariationofinternalflowfieldin3Dcomblabyrinthsealofbalancediscandnonlineardynamicchara

5、cteristicsofrotorbearingsealingsystemwithmultitoothsealingforceandoilfilmforceThespecificsummariesareasfollows：(1)Computationalfluiddynamics(CFD)analysisofthebalancediscsealingforRotorVibrationTestDeskthevariationofinter

6、nalflowfieldin3Dcomblabyrinthsealundertwentyworkingconditionsissummarized(2)AccordingtotheCFDresults，thesealingforcesofrotatingshaftwallonsealingteetharecalculatedAndtheincreasingrateofsealingforcewillbesustainedgrowthwi

7、throtatingspeedandbedecreasedwithpressuredifference(3)AccordingtotheCFDresults，MuszynskasealingparametersofsealingteetharedeterminedCircamfferentiallyaveragedvelocityratioofflowwillbeslowincreasewithrotatingspeedandbeinc

8、reasedfirstandthendecreasedwithpressuredifferenceMeanwhileMuszynskasealingforcemodeldoesn’tsatisfythesealingforcecalculationoflargeeccentricity(4)Timehistories，orbitsoftherotorcenterPomcaremapsandbifurcationdiagramsatthe

9、rotorandbearingareusedtodemonstratethedynamicfeatures，underthedynamicmodelofrotorbeatingsealingsystemwi血thecombinedmulti—toothsealingforcesandoilfilmforcesThemultipleofdoubleperiodmotionundercertainrotatingspeedwillbecha