The purpose of this study is to investigate the potential use ofin-eylinder therTnal and mixing stratification for reducing the pressure-rise rates in HCCI engines by going through numerical analysis with multi-zones modeling.The' computations are conducted using both a standard single-zone and the custom multi-zone version of the Senkin application ofthe CHEMKIN II kinetics rate code, and kinetie mechanisms for Di-Methyl Ether (DME). The objective ofcalculation with the multi-zones model is to examine the mechanism of therrnal and mixing stratified charge to reduce an excessive pressure-rise rates. The mechanism ofreducing the pressure-rise rates in the thermal and mixing stratified chargeis proved with 2-zones and 5-zenes model. It is found that thermal and mixing stratification have the effect ofreducing the pressure-rise rates (extended combustion duration) and have potential for extending the upper load limit in HCCI engines.
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