二甲醚發(fā)動機低壓共軌電控系統(tǒng)與噴油霧化特性研究.pdf

1、武漢科技大學碩士學位論文二甲醚發(fā)動機低壓共軌電控系統(tǒng)與噴油霧化特性研究姓名：吳雙凌申請學位級別：碩士專業(yè)：機械制造及自動化指導(dǎo)教師：張光德20090520AbstractRecentlydimethylether(DME)hasreceivedattentionasacleanalt鋤ativediesel允elduetoitslowNOxemissions；nearzerosmokeandlessenginenoisecompared

2、withⅡlevaluesoftraditionaldieselfuelsAsanoxygencleanalternativefuel，DMEisadaptedtothecompressionignitioninternalcombustionengine；comparedwiththemajorityofdieselandotheralternativefuels，ithastheadvantagessuchashighefficie

3、ncylowemission，10wnoisesmokefreecombustion，etcAtthesametime，itCanbeefficientlyproducedfromnaturalg勰orcoalItlsavailabletosolveourcountry’sissuesofworseningenV的nmentalpollution鋤ddeticl黜YofoilsourcessuppliesItisgoodtoourcou

4、ntry’sstrongpointofplentyofgaS觚dcoalbutlackinginoilInrecentyears，DMEasanalternativedieselfuelofdieselengineshasarousedwidespreadconcernaroundtheworld，thusthedevelopmentofDMEengineisoneofChinasmajorresearchprojectsHowever

5、thetraditionaldieselfuelsupplyandinjectionsystemcallnotmeettheDMEeIl舀ne。requlrementsofsupplyandinjection，asaresultofthedifferencesofphysicalandCneIIll測propertiesbetweenDMEanddieselInthispaper，basedonthe10wpressureCommon’

6、rallfuelsupplyandinjectionsystemofDMEengine(railpressure5MPa～20MPa)asetofeIectronlccontrolsystemsWasdesignedtoapplytothelowpressurccommonrail蚴1njectlonsystem，includingthehardwarecircuit，fuelinjectioncontrolstrategies，sys

7、t鉍theprocessesandproceduresofcontrolsoftware，andsomvaretestingInordertooptimizetheDMEengineParametersofinjectionsystemaIldconlbusti∞syst咖andaIlindepthunderstandingofthecombustionmechanismofDMEthesubjeetchosegeneralpurpos

8、eCFDsoftwareFLUENTforsimulatingDMEsprayatomizati伽pmc韶sAccordingtothecharacteristicsoffuelinjectorthesubjectchoserationalmodelofDMEsprayatomization，simulatedthemixingprocessofDMEandairobtainedthespmyatomizationpatternsatd

9、ifferentstagesofoilandgastobemixed，andex缸actedtllecnaracteristicparametersofthesprayatomizationpatternsthedistaIlceandthesprayconean出色Onbasisofthemodel，changingtheparametersofsprayfactorS，includingenvlm啪entalpressure，the

10、initialinjectionpressureandnozzlediameterthesubjecta|1alyzedtheDMEspraycharacteristicsofchangesinthelawInthispapercombiningthedomesticandforeignstudyofDME，withthefrontoftheeIectromccontrolsystemanddieselinsteadofDME，thes