三棱锥%2f空心半球型钝体微燃烧器内甲烷催化燃烧特性数值分析

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1、·重庆大学硕士学位论文中文摘要关键词：微尺度燃烧器，三棱锥型钝体，空心半球型钝体，催化燃烧···II···重庆大学硕士学位论文英文摘要ABSTRACTMicro-combustoriswidelyusedwiththerapiddevelopmentofMEMS,whichisa newtypeofportablepowerdevices.Microcombustionpowerplanthastheadvantages ofsmallvolume,lightquality,largeenergydensity,whichhasbroadprospect

2、sin applicationofnationaldefense,military,astronauticsandthedisadvantageofless combustionspace,largesurfacetovolumeratio,bigheatloss,instablecombustionand inefficient.Howtoguaranteethehighefficiencyandstablecombustionofthemicro combustorhavebecomethekeyproblems.Energyintensityofh

3、ydrocarbonfuelsis severaltimesthanthatinlithiumbattery.Thispaperstudiestheeffectofbluffbodyon thecombustioncharacteristicsofmicro-combustor,whichisbasedonthein-depth analysisoftheadvantagesanddisadvantagesofthecurrentstageofthemicro-channel stablecombustiontechnology.Thecombustio

4、ncharacteristicsofflatmicrocombustor,micro-combustorwitha hollowhemisphericalbluffbodyandmicro-combustorwitharegulartriangularpyramid bluffbodyaresimulatedandanalyzedbyFLUENT.Theresultsrevealthattheblow-offlimitsofmicro-combustorwitharegular triangularpyramidbluffbodyandwithaholl

5、owhemisphericalbluffbodyexpand2.3 and2.5timesthanthatwithoutabluffbody.Theblow-offlimitsofthe micro-combustorwitharegulartriangularpyramidbluffbodyandwithahollow hemisphericalbluffbodyare22.6m/sand24.5m/swhentheequivalenceratiois1.0. Theeffectofhollowhemisphericalbluffbodyonthepr

6、omotionofcombustion characteristicsisbetterthanthatofregulartriangularpyramidbluffbody.Theexhaust gastemperatureincreasesfirstlyandthendecreaseswiththeincreasingofinletvelocity inthemicro-combustorswitharegulartriangularpyramidbluffbodyandwithahollow hemisphericalbluffbody.Thedif

7、ferencevaluesoftheexhaustgastemperaturebetween thetwomicro-combustorsincreasewiththeincreasingofinletvelocity.Withthe increasingofinletvelocity,theareasofrecirculationzonesbehindtheregulartriangular pyramidbluffbodyandhollowhemisphericalbluffbodyincreasesgradually.The recirculati

8、onzoneprolongstheresidencetimeofthemixtu