Abstract
The purpose of this study is to find the statistical characteristics of the mixture heterogeneity in turbulent flow field for moderating the premixed charge compression ignition (PCCI) combustion and for increasing an output limit, which is restricted by an intense knock. We analyzed the interrelationship between mixture heterogeneity and reaction in a diesel PCCI combustion, using the large eddy simulation (LES) in conjunction with a reaction kinetics model. The quasi-steady gas jet model has been employed for fuel sprays. The auto-ignition and combustion behaviors were analyzed for a variety of injection conditions, including nozzle geometry, injection timing and injection pressure, in direct-injection PCCI operations. As a result, the start of the combustion event was advanced with advancing injection timing. The peak values of heat release rate increase with increasing amount of stoichiometric mixture in a hot flame reaction phase.
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