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不同间隙大小轴流压气机转子叶尖泄漏非定常流动的DDES研究（英文）.docx

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不同间隙大小轴流压气机转子叶尖泄漏非定常流动的DDES研究（英文） Title:DDESInvestigationofUnsteadyFlowinAxialCompressorRotorTipLeakageforVariousTipClearances Abstract: Axialcompressorsarewidelyusedinvariousindustriesfortheirabilitytoprovidehigh-pressureairflow.However,rotortipleakageisacommonprobleminthesemachines,whichaffectstheirefficiencyandperformance.ThisstudyaimstoinvestigatetheunsteadyflowbehaviorofrotortipleakageunderdifferenttipclearancesusingtheDelayedDetachedEddySimulation(DDES)approach. Introduction: Axialcompressorsplayacrucialroleingasturbineengines,aircraftpropulsionsystems,andotherapplicationsthatrequirehigh-pressureairflow.Theperformanceandefficiencyofthesecompressorsarehighlydependentonmaintainingastrongsealingbetweenrotorandstatorblades.However,tipleakageoccursduetothefiniteclearancebetweentherotorandstatorblades,leadingtosignificantlossofperformanceandefficiency. Previousstudieshaveshownthatrotortipleakageinducesunsteadyflowphenomena,includingtipvortexshedding,flowseparation,andinteractionbetweentheleakageflowandthemainflow.Theseunsteadyflowphenomenahaveaprofoundimpactontheperformanceandstabilityofthecompressor. Methods: Inthisstudy,theDelayedDetachedEddySimulation(DDES)approachwillbeemployedtoinvestigatetheunsteadyflowbehaviorofrotortipleakage.DDEScombinestheadvantagesofReynolds-AveragedNavier-Stokes(RANS)andLargeEddySimulation(LES)methodstoaccuratelycapturetransientflowfeatures. Toaccomplishthisobjective,thecomputationalfluiddynamics(CFD)softwareANSYSFluentwillbeutilized.Athree-dimensionalnumericalmodelofthecompressorrotorwillbedeveloped,consideringdifferenttipclearancesrangingfromsmalltolargevariations.Therotorgeometry,includingbladeshape,pitch,andcurvature,willbedesignedbasedonexistingcompressordesigns. ResultsandAnalysis: TheDDESsimulationresultswillallowustoinvestigatetheunsteadyflowphenomenaoccurringintherotortipleakage.Thetipvortexshedding,flowseparation,andinteractionbetweenleakageflowandmainflowwillbecarefullyanalyzedtounderstandtheirdependenceontipclearancesize. The