混流式水輪機內(nèi)部流場三維紊流數(shù)值計算與性能分析.pdf

1、蘭州理工大學(xué)碩士學(xué)位論文混流式水輪機內(nèi)部流場三維紊流數(shù)值計算與性能分析姓名：丁思云申請學(xué)位級別：碩士專業(yè)：流體機械及工程指導(dǎo)教師：齊學(xué)義20070510AbstractWiththedevelopmentofhydraulicturbineinrecentyearshighenergyperformance，goodcavitationperformanceandstabilityofturbinearemoreimportantthe

2、neveLConsideringtheachievementaboardonthedesignofhighperformancehydraulicturbine，CFDisanimportantdesignapproachtoobtainaccurateanddetaileddataofinnerflowTherefore，itissignificanttototallyunderstandtheinnerflowofallpassag

3、ecomponentstopredicttheperformanceofhydraulicturbineandimproveitsdesignAnditisthevaliditymethodtooptimizetheturbinedesignThedistuibutionofaxialplanestubsandstubcrossingpointsarenonuniformandquantityofthemisnotequalwhenth

4、ebladeismadebyusingtraditionaldesignmethodofturbineThesearcnotbenefitwithcalculatingwoodmodelanddrawingInthispapertomakebladewoodenpatternsisusingblademeancamberlineThismakesthewoodenpatternsmeetthedemandofthedesignandme

5、ettheshapeoftherunnerbladeAndthiscanagreewithrequirementsofhydroandmechanicalanalysisandmakingthemodelofbladebyusingthenumericalcontrolmachineIthasreferencevaluetowholedesignofturbineLowspecificspeedFranceturbineismadeby

6、thismethodInordertostudythehydraulicperformanceandthestabilityofturbine，theCFDofthedesignedlowspecificspeedFrancisturbineisdoneThro【ghthedetailssimulationcalculationoftypicalOperationconditionsofturbinesomeconclusionsare

7、showed：thedesignoftheoverflowingpartsisappropriate；theflowinthedrafttubeissmoothintheoptimaloperationconditions，therotationdirectionofthevortexbandisreversedtotherunnerinthelargeflow，andtherotationdirectionofthevortexban

8、disidenticaltotherunnerinthesmallflowThroughtheanalysisoftheoverflowingparts，somefruitsaregained：thehydrauliclossofthediversionpartsbecomessmallwhentheopeninganglebecomessmall；thehydrauliclossofrunneristhesmallestintheop

9、timalconditions，andtheinitialcavitationcoefficientbecomesmallwhentheopeninganfiebecomeslarge；ThelossofthedrafttubeconcentratesinelbowbendwhentheflowislargeandconcentratesintherightconewhenthenowissmallCombiningwithEmpiri