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Two-stage Combustion with a Turbulence Generation System for Reducing NOx and Smoke Emitted from DI Diesel Engines
ipc-8-95/9531066

Authors

Takemi Chikahisa - Hokkaido University
Tadashi Murayama - Hokkaido University
Mitsuru Konno - Ibaraki University

Abstract

This paper presents a comprehensive study of diesel combustion with high turbulence induced during the combustion process together with newly obtained results for two-stage combustion. In the two-stage combustion process the primary combustion is made fuel-rich to reduce NOx, and then the increased particulate is oxidized by strong turbulence generated during the secondary combustion. The first part of the paper shows the results and mechanism achieving significant reductions in particulate emissions by strong turbulence. The second part of the paper shows the results with two stage combustion, showing that both NOx and smoke were reduced significantly, while fuel consumption was maintained. Consideration of chemical reaction kinetics shows this combustion process to have further potential for reduction in particulate and NOx emissions.

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