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1、第2卷第3期航空工程進展Vo1.2No.32011年8月ADVANCESINAERONAUTICALSCIENCEANDENGINEERINGAug.2O11文章編號:1674—8190(2011)03—260—07圓錐脈沖等離子體誘導流場特性分析秦浩,李華星,孟宣市,羅時鈞,劉鋒(1.西北工業(yè)大學翼型葉柵空氣動力學國防科技重點實驗室,西安710072)(2.美國加州大學爾灣分校機械與宇航工程系,爾灣92697—3975)摘要:對等離子體誘導流場特性進行研究,有利于解決雙穩(wěn)態(tài)非對稱分離渦帶來的連續(xù)比例控制困難的問題。在封閉光學玻璃箱體內,應用介質阻擋放電等離子體對2O。頂角圓錐附近靜止
2、大氣進行了定常和脈沖循環(huán)控制,對等離子體誘導的圓錐截面繞流速度場進行了二維PIV測量,對定??刂坪兔}沖循環(huán)控制下最大繞流速度及最大軸向渦量進行了比較分析。實驗結果表明:相對于定常控制模式,脈沖循環(huán)控制下沿垂直于圓錐截面對稱面徑線分布的時間平均切向速度和軸向渦量范圍較廣;在脈沖循環(huán)控制下,動量傳遞的主要表現(xiàn)在離散渦的形成而不是氣流的加速。關鍵詞:圓錐體;等離子體誘導流場;主動流動控制;脈沖循環(huán);粒子圖像激光測速儀中圖分類號:V211文獻標識碼:ACharacteristicsofFlowFieldInducedbyPeriodic—pulsedPlasmaoveraConicalCone
3、QinHao,LiHuaxing,MengXuanshi,LuoShijun,LiuFeng。(1.NationalKeyIaboratoryofScienceandTechnologyonAerodynamicDesignandResearch.NorthwesternPolytechnicalUniversity,Xi’an710072,China)(2.DepartmentofMechanicalandAerospaceEngineering,UniversityofCalifornia,IrvineIrvine92697—3975,USA)Abstract:Researchof
4、flowcharacteristicsinducedbyperiodic—pulsedplasmacansolvetheproblemofcontrolcontinuousdifficultiesbroughtbytWOsteadystateasymmetricseparationvortexes.Apairofplasmaactuatorsisaddedbehindtheoriginalplasmaactuatorpairovera20。conicalforebodytOextendtheangleofattackrangeforlateralcontro1.Flowinducedb
5、ytheadditionalactuatorinastillairchamberwithoneatmosphericpressureisin—vestigatedusingatwo—dimensionalparticleimagevelocimetry.Theeffectsofpulsedutyratioandpulsefrequen—cyontheinducedmaximumcrossflowvelocityandmaximumaxialvorticityarecomparedwiththoseofsteadydischarge.Thetestsindicatethattheense
6、mble—averagedtangentialvelocityprofilealongaradiallineperpendic—ulartOthebodysymmetryplaneinducedbyperiodic—pulseddischargeisthickerthanthatofsteadyactuation.Thisiscausedbyformationofstrongerdiscretevorticesthatleavetheconesurfaceintheunsteadyactuationcase.Themainmechanismofmomentumtransferunder
7、periodic—pulsedactuationiStheformationofdiscretevortices,ratherthanthegasacceleration.Keywords:conicalcone;flowfieldinducedbyplasma;activeflowcontrol;periodic—pulsed;particleimageve一1ocimetry收稿日期:2OlO1011;修回日期:201011-240引言基金