1、天津大學博士學位論文甲醇在壓燃式發(fā)動機上的應用研究姓名：程傳輝申請學位級別：博士專業(yè)：動力機械及工程指導教師：姚春德20081201ABSTRACTMethanolderivedfrombiomass，coalandnaturalgaspresentsapromisingalternativetosubstitutefossilfuelsHoweverthelowoctanenumberofmethanolmakesautoigniti

2、ondifficultSOthatdirectapplicationofmethanoltodieselenginesishardToapplymethanolintothedieselengines，theconceptofadieselmethanolcompoundcombustion(DMCC)hasbeenproposedInthemodifieddieselengines，methanolhasbeeninjectedint

3、otheintakeairfumigationtoformthehomogeneousmixtureignitedbypilotdieselfuelThesystemwasfirstlytestedontwonaturallyaspiratedandaturbochargedengineTheexperimentalresultsshowthat，atlowloads，thebrakethermalefficiencydecreases

4、withincreaseinfumigationmethanol；butathighloadsitincreaseswithincreaseinfumigationmethan01ThefumigationmethodresultsinasignificantincreaseinHC，CO，andN02emissionsTheconcentrationofNOxissignificantlyreducedexceptatclosetof

5、ullloadconditionThereisalsoareductioninthesmokeopacityandtheparticulatematter(PM)massconcentrationForthesubmicronparticles，thetotalnumberofparticlesdecreasesatlowandmediumloadsbutincreasesathighloadsInallcasesthereisashi

6、ftoftheparticlestowardssmallergeometricalmeandiameterespeciallyathighloadsSecondlyTheDMCCsystemalsoappliedtoanaturallyaspirateddieselenginewithandwithoutanoxidationcatalyticconverterThecombustionandemissioncharacteristic

7、swerecomparedApreliminaryinvestigationofformaldehydeemissionwasconductedontheengineIntheDMCCsystem，therearetwocombustionmodestakingplaceinthedieselengine，oneisdiffusioncombustionwithdieselfuelandtheotherispremixedair／met

8、hanolmixtureignitedbythedieselfuelExperimentswereconductedatidleandatfiveengineloadsattwolevelsofenginespeedstocompareengineemissionsfromoperatingonpuredieselandonoperatingwithDMCC，withandwithouttheoxidationcatalyticconv

9、erterTheexperimentalresultsshowthattheformaldehydeemissionofengine—outincreasecomparedwiththebaselineUsingtheDMCCmodecoupledwithalloxidationcatalyst，theCO，HC，NOxandsootemissionscouldallbereducedDieselfuelcanalsobereplace