A study on the reduction of exhaust emission in a diesel combustion

摘要

The effects of EGR and water addition on reducing NO and soot emission were discussed with a stochastic model that takes chemical kinetics into account. Results show that EGR up to 10 shifts the local excess air ratio from the points where NO is formed intensively to the fuel rich regions without almost any drop in temperature. On the other hand, water addition shifts the local mixing ratio from the NO forming region to the lower temperature region without decreasing local oxygen concentration in the fuel rich region. The effects of CO{sub}2 addition on NO and soot emission were also discussed.