摘要
Thisstudyaimsatthemechanismofdragreductioninturbulentboundarylayer(TBL)withsuperhydrophobicsurface.Comparingthetime-resolvedparticleimagevelocimetry(TRPIV)measurementresultswiththatofhydrophilicsurface,thedragreductionrateoverasuperhydrophobicsurfaceisapproximately10%.Toinvestigatethecharacteristicsofcoherentstructureinadrag-reducedTBLwithsuperhydrophobicsurface,amodifiedmulti-scalespatiallocally-averagedstructurefunctionisproposedfordetectingcoherentstructure.Theconditionalsamplingandspatialphase-lockaveragemethodsareemployedtoobtainthetopologyofphysicalquantitieslikethevelocityfluctuation,spanwisevorticity,andReynoldsstressduringejectandsweepprocess.Theresultsindicatethatthesuppressionofcoherentstructureburstinthenear-wallregionisthekeymechanisminreducingtheskinfrictiondragforTBLoversuperhydrophobicsurface.
出版日期
2015年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
