高负荷扩压叶栅附面层抽吸对分离流动控制分析

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1、哈尔滨工业大学工学硕士学位论文AbstractDevelopmentofaviationenginedeterminesthelevelofChineseaviationindustry.Whenaviationenginereachestheadvancedlevel,theaviationindustrycancontinuetodevelopandadvance.Asanimportantpartoftheaeroengine,theaerodynamicperformanceofCompressorisakeyfacto

2、rforaeroengine.Withtheincreaseoftheloadofthecompressor,thethree-dimensionalflowseparationinthecascadeisgraduallyincreased,sothatthedesignofthehigh-loadcompressorbecomesmoredifficult.MIThasgiventheconceptcalledlow-reactioncompressor.ThenProfessorSongtaoWangofHITputfor

3、wardanotherkindoflow-reactioncompressorandthereistheboundarylayersuctiononlyinstaticcascades.Becauseofthelow-reactionoftherotor,theloadofthestatorishigherandtheboundarylayersuctionisadoptedtocontroltheflowseparationtoimprovetheaerodynamicperformance.Alow-reactionsubs

4、oniccompressorandalow-reactionsupersoniccompressorarechosentostudytheboundarylayersuctioninstaticcascadeandtheinfluenceoftheboundarylayersuctionontheaerodynamicperformance.Inordertoimprovetheengineeringpracticabilityoftheresults,abladecavity,suctionholes,suctionslots

5、andairentrainmentchambersareadded.Firstly,Stage35dataischosentoprovethenumericalmethodright.Thegridnumberisaboutmillion.Thek-εturbulencemodelisadopted.Numericalresultandexperimentalresultarecomparedtoprovethatthek-εturbulencemodelisappropriateandthenumericalresultint

6、hispaperisright.Afterprovingthenumericalmethodisright,alowrotatingspeedcompressorischosetostudytheboundarylayersuctionfirst.Bladecavities,suctionholesandcoversneartheendwallsareaddedinthestaticcascades.Dependingontheoriginaltypeofthethree-dimensionalflowseparation,th

7、eprogramwhichsuctiontheboundarylayerfromthesuctionsurfaceandlowerendwall.Aspecialconditionischosetostudytheboundarylayersuction.Theresultsshowsthatthereexistsaseparationflowneartheupperendwall.Buttheeffectoftheboundarylayersuctionbecomesbetterwhenthemassflowrises.Adj

8、ustingthelocalmassflowandlocationcanmakethesuctionflowdistributedagainandcanalsogetabettereffect.Itprovesthatthestrategyadjustinglo