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大连理工大学学报 2008
ComputationalandexperimentalstudyonTRcombustionsystemofdieselDOI: 10.7511/dllgxb200802006, PP. 185-192 Keywords: diesel,combustionchamber,numericalsimulation,spray Abstract: Anewcombustionsystemappliedinthe135-typedieselengine\_TR(Three-Rapidity),wasmodifiedfromdeepcaveωcombustionchamberwithanorientedarcinthemiddleofchamberwall,andperfectlyfittoanozzlewithorificesinconicsectionplusorificeinthecenter.Three-dimensionalnumericalsimulationwascompletedandcomparedbetweenTRcombustionsystemandoriginal135dieselenginecombustionsystemin50%loadbySTAR-CD.TheresultsshowthatinTRcombustionsystem,fuelignitionlocationisnearTDC,andpremixcombustionproportionincreases.Theorientedarc,contractedcaveandcentricspraycontributetoenhancingairflow,makingmorereasonablefueldistributionandformingmorehomogeneousmixture.Theusageofairinchamberiseffectivelyincreasedandheatlossfromthechamberwallisobviouslydecreased.Thecoldstartperformanceoftheengineisalsoimproved.AperformancetestonTRcombustionsystemwasmadeona135-typedieselengine.TheresultsdemonstratethatTRhasbetterexhaustsmokethantheoriginalengine.Atthelowandmoderateload,NOxemissionofTRcombustionsystemislessthantheoriginalsystem,butmoreinhighloadcondition,whichcanbesolvedbydelayingfuelspraytiming.TRcombustionhasmuchpotentialtoimproveemissionwithlessstructuralchangeoftheoriginalengine.
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