简介:SixteeninvertedsiphonsareinoperationattheBeijing-ShijiazhuangsectionintheMiddleRouteoftheSouth-to-NorthWaterDiversionProject.Theirsafeoperationiscloselyrelatedtothesafetyandthewaterdiversionefficiencyofthewholeprojectduringaniceperiod.Theiceaccumulationprocessattheinletoftheinvertedsiphonismodeledunderarealicecondition,andthenthehydraulicconditionsoftheicejampreventionareconfirmed.Accordingtotheexperimentalresultsandthedesignsizesoftheinvertedsiphons,thedetailedsafewaterdiversiondischargeandtheoperationalwaterlevelarestudied.Analysisresultsoftheseinvertedsiphonsprovidereferencesforthesafeoperationandthereasonableregulationsduringtheiceperiod.
简介:Inthispaperthecomplexstructureandpatternofshipsternflowdrivenbymulti-propellersissimulatednumericallybyusingRANSequationswithK-εturbulencemodelandpropellerliftingsurfacetheoryasessentialresearchtoolandcouplingthecomputercodeofshipsternflowtothecomputercodeofpropellerperformancepredictionthroughthemediumofbodyforce.Ashipmodelwithfourpropellersisselectedasthenumericalexample.Detailedcomputationalresultsarepresentedgraphicallyandthequalitativeandquantitativeanalysisismade.Finally,thecomparisonbetweenthecalculatedresultandtheavailableexperimentaldataismade.Theagreementbetweenthemissatisfactory.