柴油机微粒捕集器设计与实验摘要柴油机微粒排放严重地污染环境并危害人类健康，其净化技术一直是人们研究的热点。微粒捕集器DPF(DieselParticulateFilter)是控制柴油机微粒排放最有效的后处理设备，随着排放法规的日益严格，其应用将越来越广泛。为推进微粒捕集器实用化和产业化进程，本研究采用理论分析、数值计算和试验研究相结合的方式对DPF的捕集特性、阻力特性以及再生规律进行了研究。为了实现利用计算机仿真计算进行DPF结构设计与优化以及DPF性能预测，在Matlab计算平台上建立DPF捕集模型和压降模型，为高捕集效率低流动阻力DPF的开发提供技术支持。基于填充床捕集理论，布朗扩散和直接拦截捕集机理建立壁流式微粒捕集器捕集模型。理论分析壁流式微粒捕集器的捕集过程，建立空载和负载DPF压降模型。通过发动机台架试验对模型进行校验和修正。利用模型的计算程序研究排气参数对DPF捕集特性和压降特性的影响，预测空载和负载DPF的压力降，确定滤饼捕集阶段DPF压降及其构成比例随DPF碳载量的变化。为了有效控制DPF再生过程，保证其再生的安全性和完全性，在总结现有各种再生方法优缺点的基础上，提出了基于缸内次后喷LPI(LatePostInjection)喷油量控制的DPF主动再生方法，并就DPF再生进怠速DTI(DroptoIdle)不可控再生，DPF再生时机的确定方法，LPI喷油助燃主动再生控制策略进行研究。关键词：柴油机微粒捕集器捕集和压降特性IIIABSTRACTDieselparticulateemissionsseriouslypollutetheenvironmentandharmtohumanhealth,thepurificationtechnologyhasbeenaresearchhotspot.TheDPFDPF(DieselParticulateFilter)isthecontrolofdieselparticulateemissionmosteffectivepostprocessingequipment,withtheincreasinglystringentemissionregulations,itwillbewidelyapplied.Topromoteparticletrappingispracticalandindustrializationprocess,thisstudyusingthecombinationoftheoreticalanalysis,numericalcalculationandExperimentalResearchonDPFtrappingcharacteristics,resistancecharacteristicsandrulesofregenerationwerestudied.InordertorealizethecomputersimulationtopredicttheDPFstructuraldesignandoptimization,andDPFperformance.InthematlabcalculationisdevelopedontheplatformoftheDPFtrapsetmodelandthepressuredropmodel,forparticulatecollectionefficiency,lowflowresistanceDPFdevelopmenttoprovidetechnicalsupport.PackedbedcollectionbasedonthetheoryofBrowndiffusionanddirectinterceptiontrappingmechanismofwallflowparticulatetrappingmodel.Theoreticalanalysisofwallflowparticulatetrappingcollector,apressuredropmodelofno-loadandloadDPF.Inordertocheckandverifythemodelbyenginebenchtest.ThecalculatingprogramofthemodeltostudyexhaustparametersoftrappingDPFandpressuredropcharacteristicsoftheimpactandpredictionofno-loadandloadoftheDPFpressuredrop,filtercaketodeterminetrappingDPFpressuredropandtheproportionwithDPFcarbonloadchanges.InordertoeffectivelycontroltheDPFregenerationprocess,toensuretheregenerationofthesafetyandcompleteness,insummingupvariousexistingregenerationbasedontheadvantagesanddisadvantagesofthemethodsisproposedbasedoncylinderafterthesecondsprayLPI(latepostinjection)fuelinjectionquantitycontroloftheDPFinitiativeregenerationmethodandDPFregenerationintoidleDTI(droptoidleuncontrolledregeneration,methodtodeterminetheDPFregenerationtime,LPIfuelinjectedactiveregenerationcontrolstrategyresearch.Keywords:dieselparticulatetrapcaptureandpressuredropcharacteristicsIIIIV湖南涉外经济学院本科生毕业论文（设计）1前言基于碳载量判断再生时机和LPI喷油助燃DPF主动再生方法，提出DPF主动再生控制策略，分析LPI燃油喷射量最优值的确定方法。为更好的进行微粒排放控制，针对具有不同理化特性的燃料，进行微粒数量排放及其粒度分布的测量，分析DPF对不同燃料的排气微粒数浓...
