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1、ISSN1674-8484汽車安全與節(jié)能學(xué)報(bào),2012年,第3卷第2期——12/12CN11—5904/UJAutomotiveSaltyandEnergy,2012.Vo1.3No.2179—183生物柴油摻混比例對(duì)柴油機(jī)顆粒排放微觀特性的影響張小玉,馬志豪,馬凡華,徐斌,吳建(1.河南科技大學(xué)車輛與動(dòng)力工程學(xué)院,洛陽471003;2.清華大學(xué)汽車安全與節(jié)能國家重點(diǎn)實(shí)驗(yàn)室,北京100084)摘要:為研究燃用生物柴油發(fā)動(dòng)機(jī)排放顆粒的微觀特性,在一臺(tái)電控高壓共軌柴油機(jī)上進(jìn)行試驗(yàn)。發(fā)動(dòng)機(jī)在轉(zhuǎn)速2000r/min、扭矩225Nm的工況穩(wěn)定運(yùn)轉(zhuǎn)時(shí),燃用不
2、同摻混比例的黃連木籽生物柴油一柴油。利用高分辨率透射電鏡(HRTEM),按照Brasil算法,計(jì)算排放顆粒的分形維數(shù)。結(jié)果表明:生物柴油體積摻混比為0、10%和50%的3種燃料的顆粒由粒徑為26.56N28.61nm球形原始粒子構(gòu)成,具有分形特性;而生物柴油摻混比為100%時(shí),原始粒子直徑為45.57nm,與其余3種燃料相差較大。隨摻混比例的增加,分形維數(shù)逐漸增加,結(jié)構(gòu)逐漸緊湊;原始粒子的層面間距逐漸減小,氧化活性逐漸降低。關(guān)鍵詞:高壓共軌柴油機(jī);生物柴油;高分辨率透射電鏡(HRTEM);分形維數(shù);層面間距中圖分類號(hào):U461.91文獻(xiàn)標(biāo)識(shí)碼:A
3、DOI:10.3969~.issn.1674—8484.2012.02.012Influenceofbiodiesel/dieselblendsproportionsonemissionparticlemicroscopiccharacteristicsofdieselenginesZHANGXiaoyu;MAZhihao:MAFanhua;XUBin;WUJian(1.Vehicle&MotivePowerEngineeringCollege.HenanUniversityofScienceandTechnology,Luoyang471003
4、China;2.StateKeyLaboratoryofAutomotiveSafetyandEnergy,TsinghuaUniversity,Beijing100084,China)Abstract:TestswerecarriedouIjnanelectriccontroledhighpressurecommonraildieselengineloresearchonmicroscopiccharacteristicsofparticleemittedfromadieseIenginefueledwithbiodiese1.AdieseIe
5、nginefueledwithdiferenlproportionsofbiodiesel/dieselblendswasoperatedstablyat2000flminand225N-m.ThefractaldimensionoftheparticlesemissionwascalculatedaccordingtolheBrasilalgorithmusinghigh.resolutionlransmissionelectronmicroscope(HRTEM).Theresultsshowthatsphericalprimaryparti
6、clesofwhichmeandiameterrangedbetween26.56nmand28.61nmconsisloflheparticlesexhibitingcharacteristicsoffractafstructuregeneratedbylhecombustionoflhefuelswithbiodieselvolumefractionof0%.1O%and50%.Meandiameterofprimaryparticlesforfuelwithvolumefractionofbiodieselof1OO%iS45.57nm.w
7、hichisquitedifferenIfromfheotherlhreekindsoffuels.WithincreasingpercentageofPistaciachinensisBungeseedbiodiesel,fractaldimensionincreasesgraduallyandprimaryparticlesbecomemoreclosewhilemeanfringeseparationdistancesdecreaseandlheoxidationactivitiesbecomelower.Keywords:highpres
8、surecommonraildieselengine;biodiesel;high-resolutiontransmissionelec