溫差剪切分層流運(yùn)動(dòng)特性試驗(yàn)及數(shù)值模擬研究.pdf

1、≯莓交二二D2皿n盟≥，”鎊皺五乏。河浮大萼博士學(xué)位論文溫差剪切分層流運(yùn)動(dòng)特性試驗(yàn)及數(shù)值模擬研究褚克堅(jiān)指導(dǎo)教師避名王塞民熬援紐握盛鐾豎撞科生與工程堂陸—些塑掛—立L擅——逍簋盔堂疊控拱望量』捏芏璉，—直—立‘_jL—直—_屋L—跬—_L—蘭——申請(qǐng)學(xué)位級(jí)別——擅—L專業(yè)名稱————監(jiān)蝤互捏—一——論文提空日期：絲墮生』生且—i旦論文普辯日斯墊盟毫衛(wèi)且姐學(xué)檀授予單證和日舭——丑直_三L蘭一一—曼—且一—且二。。孽瞪員會(huì)主席：一—1i—直4

2、論文評(píng)閱大：—差掛；肇；，b置韭舞一、，，，冀磐婪‘鏨、譬’_』醯磐’、罩!嚙每。，∥，’。～：一，霉7l；i，。、、_j■攀》爹，一峨護(hù)鼉。7毫，≥蘩獗黲j：‘曩_一■|一一7_AbstractThedynamiccharacteristicsofthermallystratifiedshearflOWinstraightandcurvedflumeswith3bendinganglesof45。90。and180。havebeene

3、xperimentallystudiedrespectivelyThemathematicalmodelsapplyinginstraightandcurvedflumeswereestablishedTheturbulentcharacteristicsattheinterfaceofstratifiedshearflOWhavebeenanalyzedulteriorlybynumericalexperimentalinvestig

4、atiorlThemainconclusionsincludeasfollows：1TheadvancesintheresearchofthecharacteristicsofstratifiedflOWarereviewedoverallThenecessaryandfeasibilityoftheapplicationofpreciseinstrumentsandmathematicalmodelsintheresearchofst

5、ratifiedflowinstraightandcurvedflumearepointedout2ThestraightlaboratoryflumeofthermallystratifiedshearflowhasbeenestablishedSeveralexperimentaltestrunswithdifferentdischargeratioofwarmwatertocoldwaterwereconductedWithpre

6、ciseinstrumentssuchasMicroADVanddigitalthermometerthetime—averagedandturbulentcharacteristicsofstratifiedshearflOWinthestraightflumeareresearchedandthemechanismofturbulerttmixingbetweenwarmandcoldwaterlayersiSdiscoveredT

7、heanalysisofstabilityforstratifiedshearflOWinthestraightflumeiSconducted3Threecurvedflumeswithbendinganglesof45090。and180。ofthermallystratificdshearflOWhavebeenestablishedrespectivelySeveralexperimentaltestrunswithdiffer

8、entdischargeratioofwarmwatertocoldwaterwereconductedWithpreciseinstrumentssuchasMicroADVanddigitalthermometerthetime—averagedandturbulentcharacteristicsofstratifiedshearflowinthecurvedflumesareresearchedThebendeffectonmi

9、xingandstabilityforstratifiedshearflowisexplored4Arectangulargridfinitevolumealgorithmforlateral2一Dimensionanisotropick一￡modelwithbuoyancy—correctioniSestablishedBythecalculationforsomelaboratorystratifiedshearflowcasesi

10、nstraightflumeitiSshownthatthebuoyancycorrectionofthek￡modelistheestablishmentofexperimentalrelationshipbetweenthemodelandspecialstratifiedflOWpatternTheanisotropickemodelonlyadaptstosimulatethestrongstratificationSOitsa

11、pplicabilityispoor5Arectangulargridfinitevolumealgorithmfor3dimensionsecond—momentReynoldsstressmodeliSestablishedandusedtosimulatethelaboratorystratifiedshearflowcasesinstraightflumesuccessfullyBynumericalexperimentalin

12、vestigationtheturbulentcharacteristicsattheinterfaceofthermallystratifiedshearflOWinstraightflumearediscussedulteriorly6Anunstructuredgridfinitevolumealgorithmfor3dimensionsecond—momentReynoldsstressmodelisestablished，an

13、dusedtosimulatethelaboratorystratifiedshearflowcasesinstrongcurvedflumewithbendingangleofl800successfullyBynumericalexperimentalinvestigationtheturbulentcharacteristicsattheinterfaceofthermallystratifiedshearflOWiUstrong

14、curvedflumewithabendingangleofl800arediscussedulteriorlyKeywords：stratifiedflow；curvedopenflume；dynamiccharacteristic；laboratoryexperimentalinvestigation；mathematicalmodel；finitevolume；modelparameters；numericalexperiment