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Modeling the Effect of Split Injections in Diesel Engines using Representative Interactive Flamelets

, , and . SAE Technical Paper, (1999)

Abstract

A major problem in reducing pollutant emissions from diesel engines is the soot-NOx trade-off. With the introduction of the common-rail injection system splitting the injection into separate pulses has become possible. Experiments using multiple injections indicated that there is the chance to shift the soot- NOx curve closer to the origin. In order to understand the underlying physical process, multidimensional simulations have been carried out for a baseline as well as a split injection case using the Representative- Interactive-Flamelet (RIF) Model. The computations are compared to experimental data showing good agreement for both cases. The computations as well as the experiments confirm the possibility of reducing soot with only a slight increase in NOx emissions. It is shown that soot is reduced due to a different mixing process resulting in fewer rich regions.

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