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1、葉尖間隙對跨聲速風扇葉片顫振特性的影響研究（能源與動力工程學院，北京100083）摘要：本文旨在使用數(shù)伉計算方法研究風扇葉片葉尖間隙大小對葉片顫振特性的影響。研究以NASArotor67轉子為算例，使用HGFS計算程序計算了5種不同間隙卜典型工作狀態(tài)的流場和不同節(jié)徑下氣動阻尼。矩常計算采川周期性邊界條件單通道計算，非定常計算和顫振計算采用單排全環(huán)轉子計算。計算選用的葉尖閩隙包括實際工作葉尖W隙和0.25倍、0.5倍、0.75倍和2倍艽他葉尖間隙。顫振計算使川流固耦合法，考慮了第一階彎曲模態(tài)對振動的影響，通過模擬葉片勾流體的相互作用判斷其氣彈穩(wěn)定性。數(shù)伉計算結果表明，過大或過小的葉尖問
2、隙都會導致葉片最小氣動阻尼變小，存在一個屮闖葉尖fuj隙使氣動阻尼最人，氣彈穩(wěn)定性最優(yōu)。關鍵詞：葉尖間隙；泄漏渦；顫振；氣動彈性穩(wěn)定性中圖分類號：V231.3文獻標識碼：A文章編號：2015040619Theinfluenceoftipclearanceonrotorfluttercharacteristics(SchoolofEnergyandPowerEngineering,Beijing100083)Abstract:Thepurposeofthispaperistousenumericalsimulationmethodtoresearchtheinfluenceoffanb
3、ladetipclearancesizeonbladefluttercharacteristics.Takingtherotor67NASArotorasanexample，theflowfieldandaerodynamicdampingof5kindsoftypicalworkingconditionsarecalculatedbyHGFSprogram.Periodicboundaryconditionsandthesinglechannelareusedforthesimulation.Theunsteadysimulationandthefluttersimulationm
4、ethodiswholebladeandsinglerow.Thetipclearanceischosentocalculateincludingtheactualworktipclearanceandtheothertipclearancesare0.25times，0.5times,0.75timesand2times.Thefluttersimulationisbasedonthefluidstructurecouplingmethod，andtheinfluenceofthefirstorderbendingmodeonthevibrationisconsidered.The
5、numericalresultsshowthat，toolargeortoosmalltipclearancewillleadtoblademinimumaerodynamicdampingsmaller.Thereexistsamiddletipclearancemakestheaerodynamicdampingmaximumandtheaeroelasticstabilityoptimal.Keywords:tipgap;leakagevortex;flutter;aeroelasticstability!收稿日期:2015-06-20論文研究方向：計算流體力學和顫振引言Wit
6、hthedevelopmentofmodernaircraftengines，aviationengineperformancepeopleputforwardhigherrequirements.Ontheonehandrequiresahighenginethrust-weightratio,lightweightcharacteristics,theenginewasmorecompactstructure;ontheotherhandrequiresanenginewithhighreliability，longlifeandlowfuelconsumptionandothe
7、rcharacteristics,resultinginfluid-inducedvibrationproblemsincreasinglybladeThemoreprominentandcomplex.Aero-enginerotorbladevibrationchatterisaself-excitedaerodynamicinstabilitycaused.Sincethefluiddomainactiontodopositiveworkonasol
