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1、DesignConsiderationsofaVersatileSimulatorforHigh-BypassTurbofansC.BalanThecontinuingrequirementforperformanceimprovementofhigherthrustturbofansisGEAircraftEngines,metbyincreasedbypassratios.ThetrendtowardhigherbypassratiosandrelativelyEvendale,OH45215large-diameterlow-pressure-ratiofan
2、srequiresinnovativedesignapproaches,whichincludeshorterinlets,slimmernacelles,shorterfanductsandexhaustsystems,andpossibleeliminationofthrustreverser.Thesuccessofthisnewgenerationofhigh-bypassductedturbofansdependsonunderstandingtheacousticimpactfromreducedtreatmentareas,inlet-fancoupl
3、ingandoperability,aswellasoverallsystemperformance.Toachievethesegoalsaversatilescalemodelpropulsionsimulatorlargeenoughtooperateasafanrig,yetsmallenoughtobeinstalledinawindtunnelforevaluatingoverallacoustic,operability,andsystemperformance,wasdeveloped.Thecriteriaofdesigningsuchasimul
4、atoranditscapabilitiesarediscussedinthispaper.IntroductionThetrendinincreasedvolumeofairtrafficexperiencedenginesaddressconcernsrelatedtoacousticsandemissions,overthepastdecadesisexpectedtocontinuewellintothewhileretainingor,ifpossible,improvingthepropulsionsys•future.Thepotentialbenef
5、itofcontinuousimprovementsintemperformance.thepropulsionsystemandairframeperformanceisfurtherThispaperdiscussessomeofthedesignconsiderationsamplifiedbythisincreaseinairtrafficvolume.Inordertothatwereaddressedinthedevelopmentofatestbedforconcentratetheresearchobjectivestowardimprovedpro
6、pul•futureresearchrequirementsinacousticsandperformancesionsystemperformance,itisessentialtounderstandtheoflargeturbofans.Althoughthepropulsionsimulatorde•performanceattributes.Intheearlydaysofcivilaviationthescribedherewasinitiallyaimedatlarge-sizeturbofanswithperformanceattributeswer
7、elimitedtospeedandreliability.fandiameterintherangeof300cmorhigher,itcanbeeasilyThiswaslatermodifiedtoincludeefficiencyoftheoverallusedforsmallersizepropulsionsystems.system,aswellasacousticconsiderations,andthechallengewasmetbychangingfromturbojetstoturbofansofmoderatebypassratios.I