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摘要
The combustion process of diesel was simulated by the modified KIVA-3 computational code. The effect of different post injection parameters coupled with EGR on combustion and emissions were analyzed and the mechanism of soot emission reducing by post-injection was discussed. Results show that optimal post injection parameters coupled with EGR can reduce NOx and soot emissions. Post-injection enhances the turbulence intensity of in-cylinder flow, which promotes the mixing of air and combustion products. The combustion of post-injection fuel increases the in-cylinder temperature, which promotes soot oxidation rate. Promotion of soot oxidation rate is the reason for soot emission reduction by postinjection. There exists an optimum quantity and timing for post injection in different post-injection strategies. When keeping constant injection quantity, with the increase of post injection quantity and interval between main injection and post injection, soot shows an early decreasing trend and late increasing trend.
