現(xiàn)代柴油機(jī)燃燒過程中微粒及多環(huán)芳香烴變化規(guī)律的研究.pdf

1、天津大學(xué)碩士學(xué)位論文現(xiàn)代柴油機(jī)燃燒過程中微粒及多環(huán)芳香烴變化規(guī)律的研究姓名：張文美申請學(xué)位級(jí)別：碩士專業(yè)：動(dòng)力機(jī)械及工程指導(dǎo)教師：宋崇林20070101ABSTRACTToinvestigatetheformationmechanismoftheincylinderparticulateandobtainthescientificbasistocontroltheparticulateemissionfrommodemdieseleng

2、ines，theresearchwascarriedoutusingthetotalcylinderdumpingsystemdevelopedbypredecessors，anditsemphasisWasontheparticulatecharacteristicsandpolycyclicaromatichydrocarbons(PAHs)duringcombustionprocessThemajorachievementsare

3、listedasfollows：1neprimarytotalcylinderdumplingsystemwasoptimizedBasedontheimprovedsystem，thescientificexperimentalschemeandsamplingmethodwereestablished，meanwhile，thesamplingprocesswascalibrated2Thedisciplinariansofthei

4、ncylinderparticulate’Smassformationhistoryanditsnumberdistributionwereinvestigatedbybothfiltration—weighingmethodandtheElectricalLowPressurelmpactor(ELPI)detectionmethodExperimentresultsindicatedthattheparticlemass(PM)co

5、ncentrationshowedunimodaldistributionwiththecrankangleoCA)Thepeal【pointliedatabout1315oCAATDCandthepeal(valueofPMincreasedwiththefuelinjectionpressureincreasingDuringthecombustionprocess，theparticlenumberdistributionwasl

6、ognormalinformwiththeparticlediameterandthemaximumvalueWasliedatabout100nm200nmparticlediameter3Thesolubleorganicfraction(SOF)WasextractedfromtheparticulatesanditsproportioninparticulatesWascalculatedMeanwhilethepolycycl

7、icaromatichydrocarbons(PAHs)inSOFweremeasuredbyGaschromatographyMassspectrometry(GC—MS)TheanalyticalresultsshowedttlattheproportionofSOFchangedmuchwiththesamplingcrankangleInparticularattheinitialstage，theproportioncould

8、beover80％，anditdecreasedinthecombustionprocess，theminimumvalueWasabout30％，butattheendofthecombustionprocess，itincreasedagain，andthevaluecamebackto60％BoththedistributioncurvesofeachPAHmassandthetotalmassofPAHswiththesampl

9、ingcrankanglewereinaccordwiththePM’SItWasalsofoundthatwhicheveroffuelinjectionpressureortheenginespeedincreasedcouldresultinthedecreasingPAHmassInaddition，theinfluenceofthefilterpaperandthesolvent(CH2C12)ontheSOFandPAHsm

10、asswasexaminedinthisexperimentanditwasprovedthattherewasnocontaminationthroughouttheanalysisKeyWords：Totalcylinderdumpingsystem；Incylinderparticulate；Massandnumberdistribution；GaschromatographyMassspectrometry(GC—MS)；Pol