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ID:32356060
大小:18.57 MB
页数:66页
时间:2019-02-03
《rijke管丙烷非预混脉动燃烧火焰结构及稳定性》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据ABSTRACTMicro-burneristhecorecomponentofmicro.electromechanicalsystems(MEMS)andtheexistingmicro-burneraredevelopedoncontinuouscombustion.wherethemicroscaleeffects,causeproblemslikecombustioninstability,incompletecombustion,lowcombustionefficiencyandthermalefficiency,and
2、hilghpollutantemissions.Pulsecombustionhastheadvalltagesofhighcombustionefficiency,highcombustionintensity,1lighheattransferefficiency,andlowemissions,whichmaybeappliedtoovercometheexistingproblemsoftheexistingmicro-combustor.Inthisthesis,amicro。pulsatingcombustiontechnolog
3、yconceptwasproposedanditsfeasibilityWasverifiedthroughexperimentalstudy.Sincethecurrentresearcheffortsonthepulsecombustorsareonnormalsize,theoperatingcharacteristicsofthesmall/microsizepulsecombustorsarelackofknowledge.Inthiswork,somesmall/microsizequartzRijkepulsecombustor
4、swhosediameterswere10.25mmweredevelopedandtestedunderdifferentoperationalconditionsTheacousticsignalsandhigh-frequencyflameimageswerecollected,processedandanalyzedtoobtainsomeknowledgeoftheoperationcharacteristics,stabilityandflamecharacteristicsofthesmall/microsizeRijke-ty
5、pepulsecombustors.Themainfindingsofthisworkincludes:1,Accordingtoitsoperationalfrequency,thequartzpulsecombustorwithinnerdiameterof12mmandthecombustionbedheightof60mmcanbeoperatedinfourregions:lowfrequencyregion,hi曲frequ唧region,hi曲harmoniesregionandturbulenceregion.Pulsatin
6、gcombustioninthefirstthreeregionscanbecontinuousandstablewhileitwaseasytobeextinguishedintheturbulenceregion.Afrequencyhoppingphenomenonwasobservedinthepulsecombustorandtheoccurringofthefrequencyhoppingfollowsapattern”low-frequencyattenuation,hi曲frequencyenhancementandfinal
7、frequencyalternative”.Thehigh-temperatureregionintheRijketubefocusedonthepulsatingflame’Spositionandtherewasalargeaxialtemperaturegradient.2,Theoperatingstabilitymapswereplottedfortheabovepulsecombustor.Thephaserelationshipbetweenthenon-premixedpulsatingflame,gasvelocity,an
8、dgaspressureinRijketubemeetstherequirements”Rayleighcriteria”.Somespecialphenomeno
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