Abstract
The accuracy of emission models about both soot and NOx has been evaluated. Diesel engine simulation is conducted by coupling with the internal nozzle flow calculation in order to consider the cavitating effect. Three different EGR ratios, 12%, 14.5% and 17% are examined. Model parameters about both breakup and ignition models are adjusted to get better agreement with the experimental data of heat release rate. By solving the transport equations of both soot and NOx regarding the emission models, it is obtained that soot mass fraction increases in consequence of weakened oxidation effect whereas NOx mass fraction decreases as EGR rate increases.
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