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1、河北工程大学硕士学位论文越坝气流的物理模拟和数值模拟研究姓名：李书芳申请学位级别：硕士专业：水力学及河流动力学指导教师：杨纪伟20070501AbstractAbstractInthemodernhydraulicengineeringconstruction,baffleoftherapidfloodandtheatomizationfollowingitisthemostimportantprobleminahigh-headpowerstationandensureitsafetyinoperati
2、on.Theatomizedrainformedbyrapidfloodhasabigimpactonthepowerstation.Theprincipalfactorinfluencethediffusionofatomized-flowistheover-dam-flow,andtheseriouszoneoftheatomizedrainisinthevortexzonebehindthedam,so,itissignificanttostudythemotionofover-dam-flowan
3、daccuratelypredictthevortexzone.Thispaperbasesonnationalitynaturalnesssciencefunditem,researchofareaoftheatomizedrain.thefundnumberis50539060.Theprimarycoverageofthispaperis:firstly,gaveabriefdescriptiveontheover-dam-flow、atomizedrain、backward-facingstepa
4、ndrelatingbasictheoryinthepaper,thenintroducedtheresearchprocedureofthephysicaltestandresults:Thephysicaltesthasdoneinwindtunnel,thetestmodelwasmadebasedondatesoftheprototypemeasurementsofer-tanhydropowerstation,andtheprototypemeasurementhasdonebytheInsti
5、tuteofHydraulicandHydroelectricallyofChinain1999.Thetestresultsindicatethattheheightholemodel’sandthemiddleholemodel’sregurgitationzonelengthis6.53～7.6and5.87～6.8foldofthedamheightrespectively,itseemsthatthedrawmodehasaimpactontheover-dam-flow.Thisprelimi
6、narilyindicatesthatitisfeasibletostudytheatomizedrainandover-dam-flowinwindtunnel;NumericalsimulationwasdonebasedonFLUENT,useRealizableк-εturbulentmodelsimulatedtheover-dam-flowinthesamegeometrymodelandworkconditionsasthephysicaltest.Thesimulationresultsp
7、rovethatalsotheresultafewbiggerthenthephysicaltest,thenumericalresultisconsistentwiththetest,andthenumericalsimulationisfeasibleinmodeltheover-dam-flow.Atlast,westudiedtheflowindifferentReynoldsnumberunderthesamenumericalmethod,analyzedthevariationsofther
8、egurgitationlengthandthevortexcenterbasedonthevariationoftheReynoldsnumber.Atthesametime,astheover-dam-flowissimilartothebackward-facingstepflowinsomecase,wealsogiveacomparisononthetwoflowsinthispaper.Keyword:over-d
