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湍流扩散火焰中对基于混合分数的湍流燃烧模型的数值研究(英文).docx

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湍流扩散火焰中对基于混合分数的湍流燃烧模型的数值研究(英文) NumericalInvestigationonTurbulentCombustionModelBasedonMixtureFractioninTurbulentDiffusionFlames Introduction: Turbulentcombustionisacomplexandchallengingareaofresearchasitinvolvestheinteractionoffluidmechanics,chemicalkinetics,andheattransfer.Inparticular,turbulentdiffusionflamesareofgreatinterestduetotheirwidespreadapplicationsinvariousindustrialandnaturalprocesses.Theunderstandingandpredictionoftheseflamescanbeimprovedbydevelopingandanalyzingnumericalmodels.Inthispaper,weinvestigateaturbulentcombustionmodelbasedonmixturefraction(MF)forturbulentdiffusionflames. TurbulentCombustionModel: TheMFmodelassumesthatthemixtureoffuelandaircanbedescribedbyasinglevariable,theMF,whichrepresentsthemassfractionoffuelinthemixture.TheMFequationissolvedalongwiththecontinuity,momentum,energy,andspeciestransportequationsinordertoobtainthetemperature,velocity,andspeciesconcentrationsintheflame.TheMFmodelalsoincludesapresumedpdfapproachtomodeltheprobabilitydensityfunctionoftheMF. NumericalSetup: TostudytheperformanceoftheMFmodel,weperformednumericalsimulationsofalaboratory-scaleturbulentdiffusionflame.Thecomputationaldomainconsistedofarectangularboxwithdimensions20cm×20cm×20cm.Amixtureofmethaneandairwasinjectedthroughanozzleintoacoflowingstreamofheatedair.Theinletvelocityandtemperatureofthecoflowingairwerekeptconstantat1m/sand400K,respectively.Theequivalenceratioofthefuel-airmixturewas0.7.ThesimulationswereperformedusingthecommercialsoftwareANSYSFluent. ResultsandDiscussion: ThenumericalsimulationsshowedthattheMFmodelwasabletopredicttheflamestructureandcharacteristicsaccurately.Thepredictedtemperatureprofileswereingoodagreementwiththeexperimentaldata.TheMFcontoursshowedtheexpectedshapeoftheflamefront,wherethehighMFregionwaslocatedinthecentralpartoftheflameandthelowMFregionrepresentedtheambientfluid.Themodelwasalsoabletocapturetheturbulencecharacteristicssuchastheturbulentintensity,Reynoldsstresses,andtheturbulentkineticenergy. Conclusion: Inthispaper,wein