摘要
Leanpremixedcombustion,whichallowsforreducingtheproductionofthermalNOx,ispronetocombustioninstabilities.Thereisanextensiveresearchtodevelopareducedphysicalmodel,whichallows-withouttime-consumingmeasurements-tocalculatetheresonancecharacteristicsofacombustionsystemconsistingofHelmholtzresonatortypecomponents(burnerplenum,combustionchamber).FortheformulationofthismodelnumericalinvestigationsbymeansofcompressibleLargeEddySimulation(LES)werecarriedout.Intheseinvestigationstheflowinthecombustionchamberisisotherm,non-reactingandexcitedwithasinusoidalmassflowrate.Firstlyacombustionchamberasasingleresonatorsubsequentlyacoupledsystemofaburnerplenumandacombustionchamberwereinvestigated.Inthispapertheresultsofadditionalinvestigationsofthesingleresonatorarepresented.Theflowinthecombustionchamberwasinvestigatedwithoutexcitationattheinlet.Itwasdetected,thatthemassflowrateattheoutletcrosssectionispulsatingoncetheflowinthechamberisturbulent.ThefastFouriertransformofthesignalshowedthatthedominantmodeisattheresonancefrequencyofthecombustionchamber.Thisresultshedslightonaveryimportantsourceofself-excitedcombustioninstabilities.FurthermoretheLEScanprovidenotonlythedampingratiofortheanalyticalmodelbuttheeigenfrequencyoftheresonatoralso.
出版日期
2010年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
