haveperiodicstream-wiseundulatio,showedthatthismethodwasalsoeffectiveinenhancingthemixing.neverthele,whetherthesamemethodiseffectiveforsupersonicmixinglayerremaintobeaproblemworthforstudying.
foranypracticalequipment,thecriteriaforthefeasibilityoftheproposedmethodshouldbetheeasineofitsimplementation,therateofgrowthoftheexcitedvortexandthesaturatedsizeofthevortex.
inthispaper,numericalsimulatiohavebeendonefora2-dsupersonicmixinglayerwithtwodifferenttypesofexcitation,namely,theintroductionofat-swaveattheinletandtheenforcementoftheinfloweedattheloweedsidetohaveperiodicstream-wiseundulatio.theresultsshowedthatbothmethodswereeffectivewhentheconvectivemachnumbermawaslethan1,butthemethodofperiodicforcingofthestream-wiseeedattheloweedsidewasmoreeffectivethanthemethodofintroducingat-swavewas.systematiccomputatiohavealsobeendoneforanalyzingtheeffectofdifferentparameters,suchastheamplitudeoftheundulation,thefrequencyofundulation,thevelocityratioaswellastheconvectivemachnumber,onmixing.
fora2-dsupersonicmixinglayer,ifallotherparameterskeepthesame,thencomparedwiththemethodofintroducingt-swaves,althoughthemethodofforcingtheinfloweedonthe
loweedsidetoundulatewouldrequiremorepoweriut,buttheinducedvorticeswouldgrowmuchfaster,andthemethodispracticallyeasiertoberealized.theintroductionoflargeamplitudet-swaveswouldbemoredifficultfromthepracticalpointofview.
thefrequencyoftheundulationplaysanimportantroleindeterminingthedevelopmentofthean-wisevortices.thelowerthefrequencyis,
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