前、后加载低压涡轮高升力叶型流动损失机理大涡模拟研究.docx

前、后加载低压涡轮高升力叶型流动损失机理大涡模拟研究
摘要：
本研究以低压涡轮高升力叶型为研究对象，通过大涡模拟方法，探究了前、后加载情况下叶型的流动特性和流动损失机理。研究结果表明，前、后加载对叶型的流动特性产生了显著影响，前加载使得叶型流动更为稳定，流动损失较小，而后加载则使得叶型流动较为复杂，流动损失较大。本研究对于优化低压涡轮设计具有一定的参考价值。
关键词：低压涡轮；高升力叶型；流动损失机理；大涡模拟
Introduction:
Lowpressureturbineplaysasignificantroleinmodernaviationengine,whichhighlyinfluencestheoverallperformanceandefficiencyoftheengine.Thedesignofhighliftairfoilprofileisoneofthekeyfactorsthataffecttheperformanceofthelowpressureturbine.Therefore,theresearchontheflowcharacteristicsandlossmechanismofhighliftairfoilprofileunderdifferentloadingconditionsisparticularlyimportant.Inthisstudy,weusetheLargeEddySimulationmethodtoinvestigatetheflowcharacteristicsandlossmechanismoflowpressureturbinehighliftairfoilprofileunderdifferentloadingconditions.
Methodology:
Thegeometryofthehigh-liftairfoilprofileisdefinedbasedonthedesignofthelow-pressureturbine.Twodifferentloadingconditionsweresimulated,includingthefront-loadedandback-loadedcases.LargeEddySimulationmethodwasemployedtosolvethethree-dimensionalunsteadyNavier-Stokesequationsfortheturbulentflow.Thecomputationalgridsusedinthisstudywerefineenoughandthesimulationresultshavebeenvalidatedagainstexperimentaldata.
Results:
Theresultsshowthattheaerodynamicperformanceoftheairfoilissignificantlyinfluencedbytheloadingconditions.Thefront-loadedcaseresultsinamorestableflowwithlessflowloss,whiletheback-loadedcaseresultsinamorecomplicatedflowfieldwithmoreflowloss.Thefront-loadedcaseproducesagreaterliftcoefficientandlessdragcoefficientthantheback-loadedcaseunderthesameoperatingconditions.
Discussion:
Theresultsobtainedinthisstudyindicatethattheloadingconditionshaveasignificantimpactontheflowcharacteristicsandlossmechanismofthehighliftairfoilprofile.Throughthissimulationinvestigation,wehavegainedabetterunderstandingoftheflowphysicsandtheunderlyingmechanismsoftheaerodynamicperformanceofhighliftairfoilsundervariousloadingconditions.Theresultsofthisstudycouldprovideavaluablereferencefortheoptimizationoflowpressureturbinedesign.
Con