dforincompreibleflowtosupersonicflow.inthispaper,westudiedtheinfluenceofshockletsonflowcharacteristicsandtherelatiohipbetweenthestrengthofinducedshockletsandtheamplitudeofdisturbanceattheinlet.itwasfoundthattheshockletstrengthincreasedlinearlywiththedisturbanceamplitudewhenitsvaluelethan0.05.thevelocityprofilesinfrontandbehindashocklethadareciablechange.thegreatertheshockletstrengthis,thegreaterthechangewillbe.whileinthenoshockletzone,aarently,thedistributionofthedisturbancevelocitywouldchangecontinuousllyandsmoothly.fromourresults,itisinaropriateforasimpleexteionofthenon-lineartheoryofhydrodynamicstability,goodforincompreibleflow,
tothecaseofsupersonicflow.therefore,tostudyhowtheshockletswouldinfluencetheevolutionofdisturbancesisanimportantproblem.
thethirdpart:anewmethodfortheexcitationoflargescalestructuresinsupersonicmixinglayerhasbeenproposed
experimentsforsupersonicflowwithhighmachnumberwereextremelydifficulttoconduct.therefore,thenewmethodfortheexcitationoflargescalestructuresinsupersonicmixinglayerwasstudiedbydirectnumericalsimulatio.
theenhancementofthemixingforamixinglayerbyalyingexcitationisanimportantproblembothintheoryandtechnicalalication.inwang%26fiedler’sexperiment(1997),theinfloweedattheloweedsideofanincompreiblemixinglayer,whichwasconfinedinatube,wasforcedtohaveanundulation,andwitharopriateparametersfortheundulation,themixingeffectwasgreatlyenhanced.thenumericalsimulationfora2-dsuonicmixinglayer,inwhichthein-floweedattheloweedsidewasmadeto
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