Combustion phase of a diesel／natural gas dual fuel engine under various pilot diesel injection timings.docx

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1、Combustionphaseofadiese1/natura1gasdua1fue1engineundervariouspi1otdiese1injectiontimingsZhongshuWangzFangyuanZhang,YeXia*,DanWang,YunXu,GuizhiDuStateKey1aboratoryofAutomotiveSimu1ationandContro1,Ji1inUniversity,Changchun130025,ChinaARTIC1EINFOABSTRACTKeywords:Diese1/natura1gasdua1fue1enginePi1otdies

2、e1injectiontimingPi1otfue1andnatura1gascombustionphaseNumerica1simu1ationExperimentsA1thoughthebraketherma1efficiencyandexhaustemissionsperformanceoftheenginehavebeenimprovedsignificant1yinrecentyears,theseissuesaresti11notfu11y-reso1ved.Natura1gas(NG)enginehasbeenwide1yconcernedbecauseofitsextensiv

3、eresourcesandre1ative1yc1ean.Tobetterunderstandtheeffectofthepi1otdiese1injectiontimingonthecombustionphasesofthepi1otdiese1andthenatura1gas,adetai1edstudywasCOnC1UCtedbyexperimentandnumerica1simu1ation.A6-Cyfinderturbochargedintercoo1erdiese1/natura1gasdua1fue1heavy-dutyenginewasusedinthisstudy,and

4、thepi1otdiese1injectiontimingwascontro11edoveraverywiderangeatastantenginespeedof1335rmin.Theresu1tsshowthattheinjectiontiminghasanobviouseffectontheenginecombustionprocessinc1udingcombustionphasesofthepi1otdiese1andthenatura1gas,andwhichdecidetheenginetherma1efficiencyandexhaustemissions1eve1.Thech

5、emica1reactionofdiese1andnatura1gasbeforecombustionstartatthesametime,however;thembustiondurationofnatura1gas1agsbehindthatofdiese1.Inaddition,duringthecombustionover1apperiod,thein-cy1indercombustionisgoodandtheworkingabi1ityisstrong.Toadvancethepi1otdiese1injectiontimingfrom5CABTDCto35CABTDC,thech

6、emica1ignitionde1ayofdiese1showsa1engtheningtrend,andthecombustiondurationshowsashortenedtrend.Withadvancingthepi1otdiese1injection,thenatura1gascombustiondurationshowsashortenedtrend,andtheshortestisnearto16.5CA.Thereisac1earcorrespondencebetweenthe1engthsofcombustionperiodoftwofue1s.Eitherthecombu

7、stiondurationorthembustionover1apperiodshowsashortenedtrend,buttheratioofthecombustionover1apperiodtothecombustiondurationisincreasingwithadvancingthepi1otdiese1injection.Theshortestcombustiondurationcorrespondstothe1owerbrakespecificenergyconsumptionandemissions.1.Introductiontheeffectsofaddingbuta

8、no1orethano1asabiofue1additiveinvegetab1eoi1Received17September2023;Receivedinrevisedform29October2023;Accepted25November2023Avai1ab1eon1ine11December202300I6-236I/2023E1sevier1td.A11rightsreserved.Inrecentyears,environmenta1prob1emshavebecomeincreasing1yseriousandemissionregu1ationshavebecomemorean

9、dmorestrict.Accordingtothe1atestreportre1easedbytheWor1dMeteoro1ogica1Organization,theg1oba1averagetemperaturein2015-2019is1.Chigherthanthatbeforeindustria1ization,andthedegreeofg1oba1warmingisfarbeyondthepredictionandassessmentoftenyearsago,andtheg1oba1warmingisacce1erating.Whi1etheemissionregu1ati

10、onsnoton1ycontro1thenumerica1va1ueofpo11utantemissionmorestrict1buta1soputforwardmorestricttestconditionsandmethodssuchasWHTC(wordharmonizedtransientcyc1e),WHSC(wor1dharmonizedstationarycyc1e),remoteOBDandotherrequirements.A11ofthesemakethedesignofmodernengineacha11engingtask.Itisa1soanecessarytaskt

11、ousenewenergyformcarrieranddeve1opmentmoreefficientenergy,Correspondingauthor.E-mai1address:xiaye18(YXia).httpsdoi.org0.101j.fue1.2023.119869conversiontechniques1-4.Indepthstudyofcombustionmodeandf1amepropagationmechanism(5isa1soveryhe1pfu1todeve1opmoreefficientengines.However,therearesti11manyexper

12、tsandinstitutionscommittedtothedeve1opmentofc1eanerandmoreefficientenginesunderthecurrentsituationthattheinterna1combustionengineindustryisnotpromising.Thedeve1opmentofa1ternativefue1sundoubted1ymakesresearchersseethedawnofefficientandc1eaninterna1combustionengines,suchasa1coho1s,bio-diese1,methane,

13、nitromethaneandsoon.Rakopou1oseta1.6,7studiedandbiodiese1oncyc1echange,combustioncharacteristicsandemissionba1ance.Rakopou1oseta1.8conductedanin-depthstudyoftransientemissionsofturbochargeddiese1enginefue1edwithbio-diese1athotstartingevent,foundthatemissionsofsmokeandNOincreasednotab1ywhi1ethetransi

14、entperformanceandcombustionnoiseradiationwerebare1yaffected.MengYangeta1.(9examinedthenitromethanepyro1ysisandoxidationNomenc1atureCAcrankang1eBTDCbeforetop-dead-centerWHTCwordharmonizedtransientcyc1eWHSCwor1dharmonizedstationarycyc1eOBDon-boarddiagnosticsNOxnitrogenoxidesTHCtota1hydrocarbonCOcarbon

15、monoxideCO2carbondioxideNGnatura1gasCNGcompressednatura1gas1NG1iquefiednatura1gasTmjthepi1otdiese1injectiontimingCFDcomputationa1f1uiddynamicsenergyratioBPbrakepowerBSECbrakespecificenergyconsumptionHRRheatre1easerateCAO_Dcrankang1eatwhich0%ofcumu1ativeheatre1easeofdiese1CAO_Ccrankang1eatwhich0%ofcu

16、mu1ativeheatre1easeofnatura1gasCA5_Dcrankang1eatwhich5%ofcumu1ativeheatre1easeofdiese1CA5_Ccrankang1eatwhich5%ofcumu1ativeheatre1easeofnatura1gasCA50_Dcrankang1eatwhich50%ofcumu1ativeheatre1easeofdiese1CA50_Ccrankang1eatwhich50%ofcumu1ativeheatre1easeofnatura1gascharacteristics,andana1ysedthereactionpathwayindetai1whichcou1ddirecttheimprovementformode1sofnitrometha