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1、FuelProcessingTechnology91(2010)354–363ContentslistsavailableatScienceDirectFuelProcessingTechnologyjournalhomepage:www.elsevier.com/locate/fuprocAstudyonthemacroscopicspraybehaviorandatomizationcharacteristicsofbiodieselanddimethyletherspraysunderincreasedambientpressureHyungJunKima,SuHanParka,C
2、hangSikLeeb,aGraduateSchoolofHanyangUniversity,17Haengdang-dong,Seoungdong-gu,Seoul133-791,KoreabDepartmentofMechanicalEngineering,HanyangUniversity,17Haengdang-dong,Seongdong-gu,Seoul133-791,KoreaarticleinfoArticlehistory:Received2June2009Receivedinrevisedform3September2009Accepted4November2009K
3、eywords:SpraycharacteristicsBiodieselDimethylether(DME)LightintensitylevelAmbientpressureabstractTheaimofthisworkistoinvestigatethespraybehaviorsofbiodieselanddimethylether(DME)fuelsusingimageprocessingandatomizationperformanceanalysisofthetwofuelspraysinjectedthroughacommon-railinjectionsystemu
4、ndervariousambientpressureconditionsinahighpressurechamber.InordertoobservethebiodieselandDMEfuelspraybehaviorsundervariousambientpressures,thesprayimageswereanalyzedatvarioustimesafterthestartofenergizationusingavisualizationsystemconsistingofahighspeedcameraandtwometalhalidelightsources.Inaddit
5、ion,ahighpressurechamberthatcanwithstandapressureof4MPawasusedforadjustingtheambientpressure.Fromthesprayimages,spraycharacteristicssuchasthespraytippenetration,coneangle,area,andcontourplotatvariouslightintensitylevelswereanalyzedusingimageconversionprocessing.Also,thelocalSautermeandiameters(SM
6、D)weremeasuredatvariousaxial/radialdistancesfromthenozzletipbyadropletmeasuringsystemtocomparetheatomizationperformancesofthebiodieselandDMEsprays.Theresultsshowedthattheambientpressurehadasignificanteffectonthespraycharacteristicsofthefuelsatthevariousexperimentalconditions.Thespraytippenetratio
7、nandsprayareadecreasedastheambientpressureincreased.ThecontourplotofthebiodieselandDMEspraysshowedahighlightintensitylevelinthecenterregionsofthesprays.Inaddition,itwasrevealedthattheatomizationperformanceofthebiodiese
