毕业设计（论文）重型柴油机起动工况的颗粒数量排放特性

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1、重型柴油机起动工况的颗粒数量排放特性摘要：以一台采用电控高压共轨的重型柴油机为样机，分别研究了柴油机在冷机起动工况(冷却水温度为24℃)和热机起动工况(冷却水温度为80℃)的颗粒排放特性。结果表明：冷机起动工况下，颗粒数量的粒径分布呈单峰形态，核态颗粒的数量峰值粒径在20-30nm之间；热机起动工况下，颗粒数量的粒径分布呈双峰形态，核态颗粒、聚集态颗粒的数量峰值粒径分别在15nm、130nm附近。颗粒的粒径小于100nm范围内，冷机起动的颗粒数量要远大于热机起动。不论是冷机起动还是热机起动工况，瞬时颗粒数量均先上升、后下降、最后趋于相对稳定。前期起动阶段的瞬时颗粒数量均高于怠速

2、稳定阶段。冷机起动工况下，瞬时核态颗粒、聚集态颗粒的数量，大都明显高于热机起动工况。前期起动阶段、怠速稳定阶段、整个起动工况的累计核态颗粒数量，在总颗粒数量中都占有绝对支配地位。关键词：柴油机；排放；冷机起动；热机起动；颗粒数量；核态颗粒；聚集态颗粒中图分类号：TK421文献标识码：A：ParticleNumberEmissionfromaHeavy-DutyDieselEngineduringStartOperatingConditionsTanPiqiang,ZouLehua,HuZhiyuan,LouDiming,YangRong(SchoolofAutomobile,T

3、ongjiUniversity,Shanghai201804)Abstract:Inthispaper,anelectroniccontrol,commonrailheavy-dutydieselenginewasusedtostudyparticlenumberemissionduringcoldstart(thecoolanttemperatureis24oC)andwarmstart(thecoolanttemperatureis80oC)operatingconditions.Thesizedistributionsofparticlenumbershowunimoda

4、ldistribution,withapeakvalueofnucleationmodeparticlenumberbetween20nm-30nmparticlediametersduringcoldstart.Duringwarmstart,thesizedistributionsofparticlenumbershowsbimodaldistribution,withpeakvaluesofnucleationmodeparticlenumberaround15nmparticlediameterandaccumulationmodeparticlenumberaroun

5、d130nmparticlediameterrespectively.Particlenumberswithparticlesrangeindiameterbelow100nmduringcoldstartaredistinctlyhigherthanwarmstart.Nomattercoldstartorwarmstart,real-timeparticlenumbersrisefirstly,thendecline,andfinallytendtoberelativelystable.Thereal-timeparticlenumbersduringtheearlysta

6、rtstageishigherthanthattheidlestabilizationstage.Thereal-timenucleationmodeandaccumulationmodeparticlenumbersduringcoldstartareobviouslyhigherthanthatwarmstart.Thesummednucleationmodeparticlenumberabsolutelydominatesthetotalparticlenumberduringtheearlystartstage,theidlestabilizationstageandt

7、hewholestartoperatingcondition.Keywords:Dieselengine;Emission;Coldstart;Warmstart;Particlenumber;Nucleationmodeparticle;Accumulationmodeparticle目前，重型柴油机广泛应用于交通运输领域。其在实际运行过程中，会产生大量的有害排放物，而颗粒是主要的有害排放物之一，尤其是其中的细颗粒。柴油机排放的这些细颗粒占颗粒总质量的比例较小，但占颗粒总数量的比例往往较大