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1、CatalyticCombustionSystemsforMicroscaleGasTurbineEnginesAspartofanongoingefforttodevelopamicroscalegasturbineengineforpowerC.M.Spadaccinigenerationandmicropropulsionapplications,thispaperpresentsthedesign,modeling,CenterforMicroandNanoTechnology,andexperim
2、entalassessmentofacatalyticcombustionsystem.Previousworkhasindi-LawrenceLivermoreNationalLaboratory,catedthathomogenousgas-phasemicrocombustorsareseverelylimitedbychemicalLivermore,CA94551reactiontimescales.Storablehydrocarbonfuels,suchaspropane,havebeensh
3、owntoblowoutwellbelowthedesiredmassflowrateperunitvolume.Heterogeneouscatalyticcombustionhasbeenidentifiedasapossibleimprovement.SurfacecatalysiscanincreaseJ.Peckhydrocarbon-airreactionrates,improveignitioncharacteristics,andbroadenstabilitylimits.Severalrad
4、ialinflowcombustorsweremicromachinedfromsiliconwafersusingdeepreactiveionetchingandalignedfusionwaferbonding.The191mm3combustionI.A.Waitzchamberswerefilledwithplatinum-coatedfoammaterialsofvariousporosityandsur-GasTurbineLaboratory,facearea.Fornearstoichiome
5、tricpropane-airmixtures,exitgastemperaturesof1100KDepartmentofAeronauticsandAstronautics,wereachievedatmassflowratesinexcessof0.35g/s.Thiscorrespondstoapowerdensityof1200MW/m3;an8.5-foldincreaseoverthemaximumpowerdensityMassachusettsInstituteofTechnology,C
6、ambridge,MA02139achievedforgas-phasepropane-aircombustioninasimilargeometry.Low-ordermod-els,includingtime-scaleanalysesandaone-dimensionalsteady-stateplug-flowreactormodel,weredevelopedtoelucidatetheunderlyingphysicsandtoidentifyimportantdesignparameters.H
7、ighpowerdensitycatalyticmicrocombustorswerefoundtobelim-itedbythediffusionoffuelspeciestotheactivesurface,whilesubstrateporosityandsurfacearea-to-volumeratiowerethedominantdesignvariables.DOI:10.1115/1.22049801Introductionperformancetrends.Section6review
8、sdesignrecommendationsandtrade-offs,andSec.7summarizesthepaperandpresentsar-Advancesinsiliconmicrofabricationtechniquesandmicroelec-easoffuturework.tromechanicalsystemsMEMShaveledtothepossibilityofanewgener
