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1、叶片式封严及叶片设计方法研究ABSTRACTForhighloadedaxialflowcompressors,thereisalargepressuredifferencebetweentheinletandtheoutletofasinglestagewhichwillleadtoagreatleakagelossattherootofstator.Thusabladedsealtechnologyisproposedtosuppressoreveneliminatetheleakagebetweenrotatingandsta
2、tionarycomponentsasthesubstituteforthetraditionallabyrinthsealdevices.Forthisreason,ahighloadcompressorstageisdesigned.Thenthedesignmethodofsealingbladeisstudiedbythewayofcomparingsealingeffectsoflabyrinthandbladesealdevicesadoptedtothestator.Thetraditionaldesignmethod
3、ofS1/S2surfacescombinedwithoptimizationmethodisusedinthedesignprocessofthehighloadedaxialflowcompressors’firststage.FirstS2surfaceisdesignedandtheeffectsonthebladeaerodynamicperformanceofchangesinthemeridionalchannelarestudied.Andthefollowingconclusionsaredrawn:theshri
4、nkageofrotorchannelwillreducethelossandoutletabsoluteflowangle,meanwhileimprovetheefficiencyandpressureratio,thereforereducethedifficultyofstatordesign.Besides,theshrinkageofstatorchannelwillreducethediffusionfactor.Second,designingtherotarysurfaceleafofeachbladeheight
5、basedontheS2flowdesign,andthenstackthemintoathree-dimensionalblade.BycomparingtherotarysurfaceflowwithS1surfaceflowinthesamebladeheightofthe3Dblade,checkingtheconsistencybetweentherotarysurfacecalculationand3Dflowcalculation.Basedontheexistingachievementoflaboratory,th
6、eaerodynamicoptimizationdesignofprofilesontheS1flowsurfacesisappliedtothequasithree-dimensionalprocess.Theoptimizationisconductedaftertheoriginalprofileaerodynamicdesignwithdirectquestionmethod.Withtheaerodynamicoptimizationdesign,theprofilemodificationbasedonartificia
7、lexpertiseisreplacedbytheprocessofnumericaloptimization,whichreducesdependenceontheprofiledesignexpertise,shortensthedesigncycle.Then,usingbladepneumaticoptimizationdesignplatformfromourlaboratory,tomake3Doptimizationofvariablesdesignincludesmeridionalchannel,bending,g
8、razingandinstallationangleoftheblade.Thetargetflowofthedesignis6.295kg/s,thedesigngoaloftotalpressureratiois2.092.The