激光诱导气体等离子体对甲烷火焰稳定性影响的分析-analysis of the influence of laser-induced gas plasma on the stability of methane flame.docxVIP

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激光诱导气体等离子体对甲烷火焰稳定性影响的分析-analysis of the influence of laser-induced gas plasma on the stability of methane flame.docx

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激光诱导气体等离子体对甲烷火焰稳定性影响的分析-analysis of the influence of laser-induced gas plasma on the stability of methane flame

AbstractInrecentyears,HighSupersonicAircraftTechnologyhasdevelopedrapidlyinaerospacefiled.ScramjetEnginehascurrentlybeenconsideredasthebestpowersystemforsupersonicaircraftandbecomethehotresearchspotallovertheworld.Itisoneofthemostdifficulttechnologiestoachievehighlyefficientignitionandstablecombustioninthecombustionchamberofscramjet.Duetothedisabilityoftraditionalmethodstoachievegoodcombustionstabilityinscramjet,plasma-flameholdingmethodhasgraduallyattractedpeople’sattention.Comparedwiththedischargeplasma,laser-inducedplasmaisverysuitableforscramjetbecauseofitsnon-invasioncharacter,highrepetitionfrequency,capacitytogenerateplasmainanypositionandmanyotheradvantages.Afteranalyzingtheshortcomingsofcurrentresearchwork,theresearchcontentofthispaperwasdetermined.Accordingtothelaser-inducedplasmaprincipleandlaser-inducedplasmaflameholdingtheoreticalmodel,theexperimentalprogramwascomeupwith.Ontheself-designedlaser-inducedplasmaflameholdingexperimentalplatform,theeffectsofstoichiometricratio,oxygenvolumepercentage,laserpulseenergyandlaserfocalpositionontheflameextinctlimitwerestudied.Itwasfoundthatwhenthestoichiometricratiorangedfrom0.7to1.0,theflameblowofflimitwasincreasedby9.3%-25%.Whentheoxygenvolumepercentageandlaserpulseenergyreached22.2%and1.82mJ,theblowofflimitwasincreasedby87.4%and53.8%respectively.Besides,theflamecouldstillstaystableevenwhenthelaserwasliftedupthreetimesoftheburnerdiameter.Theabovehadperfectlyprovedthefeasibilityandtheeffectofthismethod.Basedonthespontaneousemissionfluorescencespectraobservedintheexperiments,O,CH,H,CH3andotheractiveradicalswerefoundoutintheplasma.BycouplingthecombustionreactionswithgasflowinFLUENTsoftware,theinfluenceofO,CH3andlaserfocalpositionontheflameblowofflimitwereinvestigated,whichwashelpfultogetabetterunderstandingofthemechanismoftheplasmaflameholdingmethodandproveditsfeasibility.Keywords:femtosecondlaser,laser-inducedplasma,blowofflimit,numericalsimulation目录摘要..................................................................