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燃气轮机燃烧室预混燃烧稳定性数值研究.docx

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燃气轮机燃烧室预混燃烧稳定性数值研究 Title:NumericalInvestigationofPremixedCombustionStabilityintheCombustionChamberofaGasTurbine Introduction: Premixedcombustioniswidelyemployedingasturbineenginesduetoitsabilitytoproducehighthermalefficiencyandlowemissions.However,maintainingstablecombustionisacriticalchallengeinthedesignandoperationofgasturbineengines.Thestabilityofpremixedcombustioncanbeaffectedbyvariousfactors,suchastheequivalenceratio,turbulenceintensity,andflamespeed.Thisstudyfocusesonthenumericalinvestigationofpremixedcombustionstabilityinthecombustionchamberofagasturbine.Byunderstandingandpredictingthefactorsaffectingcombustionstability,engineerscandesignmoreefficientandreliablegasturbineengines. CombustionStability: Combustionstabilityreferstotheabilityofacombustionsystemtomaintainaconsistentandreliableflame.Instabilitiesinthecombustionprocesscanleadtocombustionoscillations,pressurefluctuations,andevenstructuraldamagetotheengine.Thestabilityofpremixedcombustionisinfluencedbyseveralfactorsthatneedtobeevaluatedandcontrolled. FactorsAffectingCombustionStability: 1.Equivalenceratio:Theequivalenceratiodeterminesthefuel-airmixturecomposition.Aleanmixturemayleadtoleanblowout,whilearichmixturecancauserichblowout.Bothcasesresultinlossofflamestability.Theaccuratecontroloftheequivalenceratioisessentialformaintainingcombustionstability. 2.Turbulenceintensity:Turbulenceplaysasignificantroleinthecombustionprocessbyenhancingmixingandheattransfer.However,excessivelyhighturbulencelevelscandisruptthepremixedflamefront,leadingtoflameextinctionorflashback.Acarefulbalancemustbeachievedtomaintainoptimalturbulencelevelsforstablecombustion. 3.Flamespeed:Thepropagationoftheflamefrontdeterminesthestabilityofcombustion.Aslowflamespeedcanresultinflamequenching,whileafastflamespeedcancauseflameinstability.Understandingthefactorsinfluencingflamespeedanditsimpactoncombustionstabilityiscrucialforgasturbinedesign. NumericalSimulation: Numericalsimulationsusingcomputationalfluiddynamics(CFD)provideaneffectiv