加熱平行絲對(duì)流場(chǎng)渦結(jié)構(gòu)影響的實(shí)現(xiàn)研究.pdf

1、天津大學(xué)碩士學(xué)位論文加熱平行絲對(duì)流場(chǎng)渦結(jié)構(gòu)影響的實(shí)現(xiàn)研究姓名：連源申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：流體力學(xué)指導(dǎo)教師：周恒2001.6.1■ExperimentalStudyonVorticesStructuresInfluencedbyAGroupofHeatedParallelWiresAbstractAgroupofmanipulatedstreamwisevorticesisintroducedonaflatplateinthispape

2、rhotwireisappliedtomeasurevelocityinfulldevelopedturbulentregionoftheflatDifferenttechniquesareusedtostudythewallturbulentcoherentsUrueturesandvorticesstructuresnearthewallwhichareinfluencedbymanipulatedstreamwisevortice

3、sgeneratedbytemperaturefieldAgroupoflongitudinalparallelwiresisembeddinginthesurfaceofflatplatedirectcurrentisappliedtothesewiresandaperiodicaltemperaturefieldinspanwiseisgenerated，agroupofstreamwiscvorticesaregeneratedb

4、ythermalconvectionX—probeandTriplehotwireprobeareusedtomeasurevelocityandtenaperatureinstreamwisetestsectioninfulldevelopedturbulenceWallturbulentcoherentstructuresinfluencedbymanipulatedstreamwiscvorticesareanalyzedfirs

5、tSelfcorrelationMaximumenergymethodofwaveletanalysis，MuLevelmethod，VITAmethodandquadrantmethodareappliedtodetecttheperiodofburstingThedetectedresultsshowthattheintroducedstreamwisevorticescausetheincreaseoftwocases‘eject

6、ion’and“sweep”resultintheincreaseofburstingfrequencyWaveletanalysisisalsousedtostudytheinfluenceofintroducedsteamwisevorticestowalIturbulenceDWTofsignalsshowsthatintroducedvorticeshavestrongaffectionwithatreamwisefluctua

7、tingvelocityandrelativelyweakaffectionwimnormalfluctuatingvelocitysparthewallAtthesametimeMultiscaledenergyanalysisindicatesscaleincludemaximumenergyinwallturbulenceislagerthanbeforeafterthewiresareheatedVariationofvorti

8、cesstructuresandintermittencyofvorticesstructuresisstudiedinSeal“wallturbulencebyC‘踞t(yī)hestudyshowsthatpartofvorticesstructuresbegintocombin色intoonevorticesstrueturesandtheintermittenceofvorticesstructuresbeginstobeenforce