Abstract
A new type of pilot injector for low emission combustion in DI diesel engine has been developed by applying the authors' creative conception which are an active control of the time-dependent spray penetration and an appropriate radial distribution of local Sauter Mean Diameter during the ignition lag. The concept was realized in the new-type pilot injector where the opening pressure of the second stage (main injection) was higher than that of the first stage (pilot injection). In this paper, the new spray concept and the relationship between the design factors of the Dodge Plunger set in the injector and the fundamental injection characteristics were made clear.
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