Design Optimization of a Submerged Entry Nozzle for Minimum Meniscus Turbulent Kinetic Energy

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1、th6WorldCongressesofStructuralandMultidisciplinaryOptimizationRiodeJaneiro,30May-03June2005,BrazilDesignOptimizationofaSubmergedEntryNozzleforMinimumMeniscusTurbulentKineticEnergyK.J.Craig,L.J.Haarhoff,C.A.Pretorius,G.J.deWetMultidisciplinaryDesignOptimizationGroup(MDOG),Departmento

2、fMechanicalandAeronauticalEngineering,UniversityofPretoria,Pretoria0002,SouthAfrica.ken@up.ac.za1.AbstractThepaperdescribestheprocesstodeterminetheoptimumparametersofaSubmergedEntryNozzle(SEN)forminimummeniscusturbulentkineticenergy(i.e.,stablemeniscus)duringthecontinuouscastingofst

3、ainlesssteelslabs.Designvariablesincludetheportangle,portheightandwelldepthoftheSEN,whiletheeffectofsubmergencedepthisinvestigated.TheSENisdesignedforawidthrangeof1000mmto1300mm,andacastingspeedof1.3m/min.TheComputationalFluidDynamics(CFD)analysisofthemoldandSENfortwoslabwidthsisper

4、formedusingthek-ωturbulencemodelanddynamicadaptionofthemeshasinFluent.Thegridgenerationprocessisfullyparameterizedfortwelvepossibledesignvariablesandcompletelyautomated.TheoptimizationisperformedusingLS-OPT’sCentralCompositeexperimentaldesignwith17designpointsforthe3designvariables.

5、DifferentobjectivefunctionsareconsideredbecauseofthetransientnatureofthemoldandSENflowfield.Duetothehighcostofthefunctionevaluations,onlyonedesigniterationisperformed.TheCFDmodelisvalidatedusingwatermodelresultsobtainedwiththeUniversityofPretoria’s40%moldwatermodel.Thevalidationresu

6、ltsshowverygoodagreementofboththebaseandimproveddesignbetweentheCFDandwatermodel.FluentisusedastheCFDsolver.Alimitedinvestigationisperformedoftherobustnessoftheimproveddesign.Theresultsshowthatthestandarddeviationoftheresponsesisabout10%foralltheresponseswhenspecifyingthetoleranceso

7、nthedesignvariablesexpectedduringthemanufactureoftheSEN.2.Keywords:Continuouscastersubmergedentrynozzle,optimization3.IntroductionComputationalmodelingofcontinuouscastercomponents[1-7]hasbeenusedforthelastdecadetosupplementtraditionalexperimentalmethodssuchaswatermodelingandplanttri

8、als[8-12].Ascomputa