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1、南京航空航天大學(xué)博士學(xué)位論文二維射流的穩(wěn)定性及控制研究姓名：李勇申請學(xué)位級別：博士專業(yè)：流體力學(xué)指導(dǎo)教師：明曉2000.4.1南京航空航天大學(xué)博士學(xué)位論文StabilityAnalysisandControlofTw0DimensionalJetsInthispaper，thestabilitycharacteristicsandflowcontroloftwo—dimensionaljetsareextensivelyinvestig

2、atedInstabilityoftwo—dimensionaljetshasbeenstudiedbynumericalanalysisandexperimentsbasedonthetheoreticalframeworkofabsoluteandconvectiveinstabilityStabilityanalysishasshownthatthereexistsconvectiveinstability，insteadofab

3、soluteinstabilityexistinginwakesbehindblunt，whichmeRnsnoselfsustainedoscillationinjetsExperimentalresultsalsoindicatethatthejetisverysensitivetoinitialsmallacousticdisturbanceamplitudeTheevolutionoftheinstabilitymodesisg

4、overnedbyspacialgrowththeoryThemixingrateenhanceseffectivelyandthejetspreadingincreasesconsiderablyThestabilityofthejetwillbechangedfromconvectiveinstabilitytoabsoluteinstabilitybychangingthelocalaveragevelocityprofile，S

5、OthatwecancontrolthejetThisthesisexperimentallystudiesatwo—dimensionalplanarjetimpinginguponanairfoillocatedatthecenterofthepotentialcoreregionTheratioofwidthbetweentheairfoilwakeandtheietVariesatdifferentattackoftheairf

6、oilTheinteractionbetweentlleairfoilwakeandthejetiSweakatthelittlea，butthecharacterofthejetsubstantiallychangedatthelarge口，andtheimpingingjetflowfieldisselfsustainedsystemExperimentalresultsalsoshowthatthesinuousmodevorte

7、xsheddingfromtheairfoilwhichactsasadipolesourcewiththepressurefluctuatingontheairfoilafterthejetflowpassesthroughBecausethevortexformationandmergingtakeplaceearlierinselfsustainedoscillatingflowatthelargeⅡ，themixingratei

8、salsoeffectivelyenhancedandthespreadingrateofthemixinglayerincreasesconsiderablyTheeffectiveofthemixingrateandthespreadingrateisbetterthanthefreejetunderthecontrolofthesmallexcitationStabilityanalysisofthemixingflowimmed

9、iatelybehindtheairfoilatthelarge口yieldedthatthereisanabsoluteinstabilitywhichCansupplysufficientenergySOthattheimpingingjetflowCanmaintainselfsustainedoscillationsThejetflowisstilllocallyconvectivelyunstablefromthepointo

10、fviewofvorticityfluctuationsbutthedynamicsoftheflowiSdominatedbyafeedbackloopTheinteractionbetweenthevorticalstructuresandthedownstreambodythengeneratesglobalirrotationalpressuredisturbancewhichtravelalongtheupstreambran

11、choftheloopInthecon仃ary，atthesmall口theinstabilityisoftheconvectivetypewhichmeansitCannotsupplysufficientenergythroughfeedbacklooptokeepselfsustainedoscillationsNovelfluidicactuatorsonzero—mass—fluxjetstechnologyareusedto

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