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时间:2020-05-01
《仿鲸鱼鳍翼段气动控制实验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第10期工程热物理学报Vo1.34.NO.102013年10月JOURNALOFENGINEERINGTHERM0PHYSICSOct..2013仿鲸鱼鳍翼段气动控制实验研究王国付,2,3张明明,3徐建中,3(1.中国科学院工程热物理研究所,北京100190;2.中国科学院大学,北京100049;3.中国科学院风能利用重点实验室,北京100190)摘要本文以开发低雷诺数下优良气动特性翼段为目标,对以NACA634—021翼型为基型的光滑翼段和仿生翼段模型,在0。^一9O。攻角,雷诺数Re=2x10的条件下,采用五
2、分量测力天平和粒子图像测速仪(PIV)于直流风洞中分别测量升阻力等翼型气动特性和流场特性。结果表明:仿生翼段的失速特性更为平缓,失速后升力系数提高21%,升阻比增加23%,阻力系数减小3%,在30。一80。大攻角区具有一定增升减阻效果。作用机理:改变了光滑翼型的边界层分离模式,加强了边界层内部和外部势流的动量交换,进而增强了吸力面流场抵御逆压梯度的能力,使得流动分离推迟,失速得以延缓。关键词仿生翼段;气动特性;风洞实验;测力天平;粒子图像速度仪(PIV)中图分类号:TK83文献标识码:A文章编号:0253—231X(20
3、13)10184205ExperimentalStudyonBionicWavyEdgeAerodynamicCharacteristicsofAirfoilⅥ,ANGGUO—Fh1,2,3ZHANGMing—Ming,。XUJian-Zhong,3(1.InstituteofEngineeringThermophysics,ChineseAcademyofSciences,Beijing100190,China;2.UniversityofChineseAcademyofSciences,Beijing100049,C
4、hina;3.TheKeyLaboratoryofWindEnergyUtilizationofCAS,Beying100190,China)AbstractThispaperfocusesonthedevelopmentoflOWReynoldsnumberairfoilaerodynamiccharacteristicsofgoodgoal,basedontheairfoilNACA634—021assmoothandwaⅣywingsegment,atthe0。一90。angleofattackandReynold
5、snumber2×10.usingfive—componentforcebalanceandparticleimagevelocimetry(PIV)weremeasuredthecharacteristicsofliftanddraginthewindtunnel,otheraerodynamiccharacteristicsofairfoilsandflowfield.Theresultsshowthat:thewavywingsegmenthavemoregentlestallcharacteristicsands
6、ignificantimprovementinaerodynamiccharacteristics,whichthemaximumliftcoe币cientiSincreasedbv21%,themaximumlift—dragratioisincreasedby23%.dragcoeficientisreducedby3%inthe30。80。angleofattack,thestallcontrolmechanismis:thescopeofthevortexstructureintheboundarylayeris
7、notlimited,thevortexstrengthentheinternalboundarylayerandexternalpotentialflowofmomentumexchange,thusenhancingtheairfoil’Sabilitytowithstandtheadversepressuregradient,reducingthenegativepressuresuctionsideofthegradient,makingtheflowseparationdelay,stallcanbedelay
8、ed.Keywordsbionicwavyedgeairfoil;aerodynamiccharacteristics;windtunnelexperiment;mea-suredpowerbalance;particleimagevelocimetry(PIV)0引口随着风力机的大型化发展,叶片的大型化使风为了提高
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