叶尖间隙对跨声速风扇叶片颤振特性的影响研究

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1、叶尖间隙对跨声速风扇叶片颤振特性的影响研究（能源与动力工程学院，北京100083）摘要：本文旨在使用数伉计算方法研究风扇叶片叶尖间隙大小对叶片颤振特性的影响。研究以NASArotor67转子为算例，使用HGFS计算程序计算了5种不同间隙卜典型工作状态的流场和不同节径下气动阻尼。矩常计算采川周期性边界条件单通道计算，非定常计算和颤振计算采用单排全环转子计算。计算选用的叶尖闽隙包括实际工作叶尖W隙和0.25倍、0.5倍、0.75倍和2倍艽他叶尖间隙。颤振计算使川流固耦合法，考虑了第一阶弯曲模态对振动的影响，通过模拟叶片勾流体的相互作用判断其气弹稳定性。数伉计算结果表明，过大或过小的叶尖问

2、隙都会导致叶片最小气动阻尼变小，存在一个屮闯叶尖fuj隙使气动阻尼最人，气弹稳定性最优。关键词：叶尖间隙；泄漏涡；颤振；气动弹性稳定性中图分类号：V231.3文献标识码：A文章编号：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论文研究方向：计算流体力学和颤振引言Wit

6、hthedevelopmentofmodernaircraftengines，aviationengineperformancepeopleputforwardhigherrequirements.Ontheonehandrequiresahighenginethrust-weightratio,lightweightcharacteristics,theenginewasmorecompactstructure;ontheotherhandrequiresanenginewithhighreliability，longlifeandlowfuelconsumptionandothe

7、rcharacteristics,resultinginfluid-inducedvibrationproblemsincreasinglybladeThemoreprominentandcomplex.Aero-enginerotorbladevibrationchatterisaself-excitedaerodynamicinstabilitycaused.Sincethefluiddomainactiontodopositiveworkonasol