rijke管丙烷非预混脉动燃烧火焰结构及稳定性

《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