comparison of models to predict low engine order excitation in a high pressure turbine stage
comparison of models to predict low engine order excitation in a high pressure turbine stage
COMPARISONOFMODELS
TOPREDICTLOWENGINEORDER
EXCITATIONINAHIGHPRESSURE
TURBINESTAGE
MarkusJöcker,1AlexandrosKessar,1TorstenH.Fransson,1GerhardKahl,2Hans-JürgenRehder3
1RoyalInstituteofTechnology
S-10044Stockholm,Sweden
markus@egi.kth.se
alex@egi.kth.se
fransson@egi.kth.se
2MTUAeroEngines
D-80995Munich,Germany
Gerhard.Kahl@muc.mtu.de
3GermanAerospaceCenter
D-37073Göttingen,Germany
hans-juergen.rehder@dlr.de
AbstractThepapercomparesthreenumericalstrategiestopredicttheaerodynamicro-
torexcitationsourcesof"LowEngineOrder"(LEO)inahigh-pressureturbinestage.Mainfocusislaidonmethodstocomputethestatorexit ow.Theaimistoevaluatecomputationallycheapapproachestoavoidmodelingthewholecircumferenceofthestator.Asinglepassageviscousstrategy,asinglepas-sageinviscidlinearblademovementstrategy,andaviscousmulti-passagesectorstrategyarecomparedandevaluated.Theassessmentofthepredictionqualityismadebycomparisonofthecomputedstatorexit owtoexperimentaldata.Themainresultisthatonlytheglobalbehaviorofthestatorexit owisestimatedright,boththelevelandamplitudeofMachnumberandpressurearecomputedwithpooragreementtoexperiments.Futureevaluationsoftheresultingrotorexcitationpressureareneededtoestimatethelevelofnecessaryagreementtogiveacceptablepredictionsofthelowengineorderforcedresponse.
Keywords:ForcedResponse,LowEngineOrderExcitation,HighPressureTurbine,Stator
Non-Uniformity
145
K. C. Hallet al.(eds.),
Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines, 145–159. © 2006 Springer. Printed in the Netherlands.
