Modeling the Effect of EGR on Combustion and Pollution of Direct Injection Diesel Engines with Flow Field Model

At the present work, the effect of EGR (exhaust gas recirculation) on combustion and pollution of a direct injection diesel engine by CFD code FIRE has been investigated. The ε−k turbulence flow field model in combination with “Wave” and “Eddy break- up” models are employed to predict spray atomization and combustion. The calculations are at the engine speed of 1400 rpm and full load mode. The EGR percentage is from zero to 30. The results show that EGR can reduce cylinder pressure and temperature. Hence, Nox is reduced significantly but Soot is increased. The predicted values of cylinder pressure and Nox emission in the case of 0% EGR, show a good agreement with the experimental data.

کلیدواژه ها:

EGR ، diesel engine ، combustion ، Nox ، Soot