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1、FluentCombustionModelingCaseStudies1999UserGroupMeetingShortCourseGrahamGoldinFluentInc.Threecasesstudies:IFRFswirlingpulverizedcoalflameGELM-1600gasturbinecombustorLargeEddySimulationofLPCinstabilityCase1:IFRFswirlingpulverizedcoalflameIFRFindustrialscalefurnaceBuiltonsimulationbyPetersandW
2、eber(1997),MathematicalModelingofa2.4MWSwirling,PulverizedCoalFlame,CombustionScienceandTechnology,122,131[Ref.1]exhaust7coolingloopsmeasurementlocations:z=0.25m,0.85mcombustionair:swirlno.=0.923,flowrate=2684kg/hcoalflowrate=263kg/h,withtransportairflowrate=421kg/h1/4geometryGrid3D,onequart
3、ergeometrymodelduetoperiodicityUnstructuredhexahedralmesh70kcellsbeforeadaption260kcellsafterregionadaptionnearinletMaximumequi-angleskewof0.53TurbulencemodelingStandardk-eturbulencemodel,standardwallfunctionsnotsubstantiallysensitivetotheturbulencemodelMeanvelocitymagnitude(m/s)Gasphasecomb
4、ustionmodeling(1)EddyDissipation(Magnussen)model[parametersfromRef.1]twostepreactionVOL+2.46O22.17CO+0.633CO2+2.118H2O+0.071N2CO+0.5O2CO2modelconstantsA=0.6,B=1020(standardA=4,B=0.5)Adjustedspecificheat’s(SIunits)Speciesc0c1c2c3c4c5c6N21.027e32.162e-21.486e-4-4.484e-8CH42.005e3-6.814e-17.086
5、e-3-4.714e-68.513e-10CO1.047e3-1.568e-15.399e-4-3.011e-75.050e-11H21.415e41.737e-16.900e-4CO25.354e21.279-5.468e-4-2.382e-71.892e-10H2O1.938e3-1.1813.644e-3-2.863e-67.596e-10O28.763e21.228e-15.583e-4-1.202e-61.147e-9-5.124e-138.566e-17Gasphasecombustionmodeling(2)Meantemperature(K)Gasphaseco
6、mbustionmodeling(3)MeanCOppm,dryDiscretephasemodeling(1)GottelbornhvBbcoalproximate(weight%,dry),volatiles55.0,fixedcarbon36.7,ash8.3ultimate(weight%,daf)C80.36,H5.08,N1.45,S0.94,O12.17LowerCalorificValue(LCV,MJ/kgdaf)volatiles32.3,char32.9Rosin-Rammlersizedistributionsmallest1mm,largest300m
7、m,mean45mm,spread1.36Singleratedevolatizationmodel,A=2*105s-1,E=7.4*107J/kmolKinetics/diffusion-limitedsurface(char)combustionO2diffusionrateconst=5*10-12kg/m2sPa,A=6.7kg/m2sPa0.5,E=1.14*108J/kmolDiscreteRandomWalk(DRW)model21600tracksperDPMiterati
