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1、河北工程大學(xué)碩士學(xué)位論文越壩氣流的物理模擬和數(shù)值模擬研究姓名：李書芳申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：水力學(xué)及河流動(dòng)力學(xué)指導(dǎo)教師：楊紀(jì)偉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