后缘小翼对旋翼翼型动态失速特性的影响分析.pdf

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1、中国科技论文在线http://www.paper.edu.cn后缘小翼对旋翼翼型动态失速特性的影响#分析**马奕扬，招启军5（南京航空航天大学直升机旋翼动力学国家级重点实验室，江苏南京，210016）摘要：针对后缘小翼（Trailing-EdgeFlap，TEF）的运动参数对旋翼翼型动态失速特性进行了研究。建立了一套适用于带有后缘小翼控制的旋翼翼型非定常流动特性模拟的高效、高精度CFD方法。为保证后缘小翼附近的网格生成质量，建立了基于翼型点重构的方法来描述后缘小翼的偏转运动。以有试验结果验证10SC1095翼型为算例，精确捕捉了动态失速状态下的气动力迟滞效应，验证

2、了本文方法的有效性。着重针对SC1095旋翼翼型的动态失速状态开展后缘小翼的控制分析，提出了可以体现翼型升力、阻力及力矩综合特性的关系式Po和Pc，揭示了后缘小翼振荡频率对动态失速特性影响的规律。研究结果表明：当后缘小翼偏转的无量纲频率为1.0时，后缘小翼能够更好地抑制翼型动态失速现象；在此状态下，当偏转幅值为10°时，SC1095翼型最大阻力系数和最大力矩系数可以分别降低19%和27%。15关键词：飞行器设计；旋翼；翼型；动态失速；后缘小翼；URANS方程中图分类号：V211.3,V211.52AnalysesonEffectsofTrailing-edgeFl

3、apontheDynamicStallCharacteristicsofRotorAirfoil20MAYiyang,ZHAOQijun(NationalKeyLaboratoryofScienceandTechnologyonRotorcraftAeromechanics,NanjingUniversityofAeronauticsandAstronautics,Nanjing,210016,China)Abstract:Effectsofmotionparametersoftrailing-edgeflap(TEF)onthedynamicstallchara

4、cteristicsofrotorairfoilareinvestigated.Ahigh-efficiencyandhigh-precisionCFDmethodforpredictingthe25unsteadyflowcharacteristicsofrotorairfoilwithTEFcontrolhasbeenestablished.InordertokeepthequalityofthegridsaroundTEF,areconstructionofgridpointsonairfoilhasbeenconductedtodescribethemot

5、ionofTEF.ThedynamicstallcasesofSC1095rotorairfoilsarecalculatedusingthepresentmethod,itisdemonstratedthatthehysteresiseffectsarewellcaptured,whichverifiestheeffectivenessofnumericalsimulationmethodondynamicstallthroughthecomparisonwith30experimentaldata.Focusingonthedynamicstallcaseso

6、fSC1095rotorairfoil,analysesondynamicstallcontrolviatrailing-edgeflaparecarriedout.ThefunctionPoandPcwhichcanreflectthelift,dragandmomentcharacteristicsofairfoilareproposed.Theeffectsofthenon-dimensionalfrequencyofthetrailing-edgeflaphavebeenrevealed.Theresultsindicatethatdynamicstall

7、phenomenonofanoscillatoryairfoilcouldbesignificantlysuppressedwhennon-dimensionalfrequencyofthe35trailing-edgeflapis1.0.Atthisstate,themaximumdragandnegativemomentcoefficientsofSC1095airfoilcanbereducedbyabout19%and27%respectivelyviaTEFcontrolwiththeangularamplitudeis10°.Keywords:airc

8、raftd