16 Modeling-Species-Transport

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1、Chapter16:ModelingSpeciesTransportandGaseousCombustionThistutorialisdividedintothefollowingsections:16.1.Introduction16.2.Prerequisites16.3.ProblemDescription16.4.Background16.5.SetupandSolution16.6.Summary16.7.FurtherImprovements16.1.IntroductionThistutorialexaminesthemixingofchemicalsp

2、eciesandthecombustionofagaseousfuel.Acylindricalcombustorburningmethane()inairisstudiedusingtheeddy-dissipationmodelinANSYSFLUENT.Thistutorialdemonstrateshowtodothefollowing:•Enablephysicalmodels,selectmaterialproperties,anddefineboundaryconditionsforaturbulentflowwithchemicalspeciesmix

3、ingandreaction.•Initiateandsolvethecombustionsimulationusingthepressure-basedsolver.•Examinethereactingflowresultsusinggraphics.•PredictthermalandpromptNOxproduction.•UsecustomfieldfunctionstocomputeNOpartspermillion.16.2.PrerequisitesThistutorialiswrittenwiththeassumptionthatyouhavecomp

4、letedoneormoreoftheintroductorytutorialsfoundinthismanual:•IntroductiontoUsingANSYSFLUENTinANSYSWorkbench:FluidFlowandHeatTransferinaMixingElbow(p.1)•ParametricAnalysisinANSYSWorkbenchUsingANSYSFLUENT(p.77)•IntroductiontoUsingANSYSFLUENT:FluidFlowandHeatTransferinaMixingElbow(p.125)andth

5、atyouarefamiliarwiththeANSYSFLUENTnavigationpaneandmenustructure.Somestepsinthesetupandsolutionprocedurewillnotbeshownexplicitly.Release14.5-©SASIP,Inc.Allrightsreserved.-ContainsproprietaryandconfidentialinformationofANSYS,Inc.anditssubsidiariesandaffiliates.663ModelingSpeciesTransporta

6、ndGaseousCombustionTolearnmoreaboutchemicalreactionmodeling,seeModelingSpeciesTransportandFinite-RateChemistryintheUser'sGuideandSpeciesTransportandFinite-RateChemistryintheTheoryGuide.Otherwise,nopreviousexperiencewithchemicalreactionorcombustionmodelingisassumed.16.3.ProblemDescription

7、ThecylindricalcombustorconsideredinthistutorialisshowninFigure16.1:CombustionofMethaneGasinaTurbulentDiffusionFlameFurnace(p.664).Theflameconsideredisaturbulentdiffusionflame.Asmallnozzleinthecenterofthecombustorintroducesmethaneat80
.Ambientairentersthecombustorcoaxiall