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1、學(xué)兔兔www.xuetutu.com第52卷第4期機(jī)械工程學(xué)報VO1.52NO.42016年2月JOURNALOFMECHANICALENGINEERINGFeb.2016DoI:lO.3901/JME.2016.04.148合成射流對鈍尾緣翼型氣動特性的影響木程曉龍馬朝臣劉恒楊策(北京理工大學(xué)機(jī)械與車輛學(xué)院北京100081)摘要:研究吸力面存在合成射流的情況下,鈍尾緣翼型TR一4000—2000流場結(jié)構(gòu)的變化及其升阻力系數(shù)等氣動特性參數(shù)的變化趨勢。在相同射流入口速度條件下,采用計算流體力學(xué)軟件Fluent對相同來流速度不同攻角情況下翼型流場進(jìn)行非定常數(shù)值模擬計算,分析射流前后翼型升阻力系數(shù)變
2、化及翼型表面壓力的波動狀況;在此基礎(chǔ)上,對不同射流頻率和不同射流速度情況下翼型流場進(jìn)行模擬計算,尋求最佳射流參數(shù)。結(jié)果表明,由于射流及尾緣渦的相互作用導(dǎo)致翼型的升阻力特性不斷變化,鈍尾緣翼型吸力面合成射流有明顯的增升減阻效果,在15。攻角時尤為明顯,升力系數(shù)提高約40%,阻力系數(shù)減小約25%。在量綱一射流速度和量綱一射流頻率均為1時,射流對翼型的增升減阻效果最佳。關(guān)鍵詞:合成射流;鈍尾緣翼型;數(shù)值模擬;升阻力特性;壓力波動中圖分類號:TK40InfluenceofSyntheticJetonAerodynamicCharacteristicsofBluntTrailingEdgeWindTur
3、bineAirfoilCHENGXiaolongMAChaochenLIUHengYANGCe(SchoolofMechanicalEngineering,BeijingInstituteofTechnology,Beijing100081)Abstract:AstudyonblunttrailingedgewindturbineairfoilTR-4000—2000islunchedtoinvestigatethechangingtrendofflowfiledstructureandaerodynamiccharacteristicswhenthesyntheticjetexistingo
4、nsuctionsur~ce.Keepingtheconstantvelocityofjet,unsteadynumericalsimulationofairfoilflowfieldindifferentattackcomerisperformedbythemeanofComputationalFluidDynamicssoftwareFLUENT,andtheinfluencecausedbyjetonaerodynamiccharacteristicsandthepressurefluctuationonairfoilsurfaceareanalyzed,basedonthis,theb
5、estjetparametersaredeterminedthrewnumericalsimulationindifferentjetvelocityandfrequency.TheanalyticresultsshowthattheliftanddragcharacteristicoftheairfoilconstantchangesbecauseofinteractionbetweenthesyntheticJetandthetrailingedgevortex,thesyntheticjetonsuctionsurfacehassignificanteffectonliftpromoti
6、onanddragreduction,andtheresultisparticularlyobviousatattackangleof15,whereliftcoefficientincreases40%,anddragcoefficientdecreases15%.Besides.thebestjeteffectOccurswhenthedimensionlessjetvelocityandthedimensionlessfrequencyareboth1.Keywords:blunttrailingedgeairfoil;numericalsimulation:liftanddragcha
7、racteristic;pressurefluctuation應(yīng)用到流動控制研究中,受到學(xué)術(shù)界的廣泛關(guān)注,0前言其后,針對合成射流致動器的工作機(jī)理及應(yīng)用研究也逐漸成為熱點。在控制流動分離原理研究方面,合成射流,也即零質(zhì)量射流,是一種全新的、文獻(xiàn)[2—3]認(rèn)為合成射流在激勵器出口附近形成“等具有廣泛應(yīng)用前景的流動控制技術(shù)。與傳統(tǒng)的流動效的虛擬氣動外形”,改變了激勵器附近的邊界層厚控制手段相比,這種射