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论文类型：会议论文

发表时间：2017-12-10

卷号：2017-December

摘要：Both the gasoline/diesel (G/D) and methanol/diesel (M/D) reactivity controlled compression ignition (RCCI) engines are optimized at low-to-medium load. The results indicated that the impact of fuel property on the determination of the optimal parameters is significant. It is found that homogeneous fuel/air distribution with high premixed ratio and advanced start of injection (SOI) is beneficial for the improvement of engine performance for both G/D and M/D RCCI. Meanwhile, the high initial temperature is indispensable to avoid the excessively late CA50 and the deteriorated combustion efficiency. Fuel reactivity and combustion rate are two important parameters for the fuel in RCCI engines. Due to the lower reactivity and the faster combustion rate of methanol than those of gasoline, lower premixed ratio and more retarded SOI are adopted in M/D RCCI than G/D RCCI to advance the CA50 and alleviate the fast combustion rate. Moreover, higher exhaust gas recirculation (EGR) rate is required for M/D RCCI to reduce its fast combustion rate. Boosting the in-cylinder pressure (PIVC) has two contradictory effects on the combustion temperature and fuel efficiency. Owing to the later CA50 in M/D RCCI, the higher PIVC is favorable for M/D RCCI, while lower PIVC is preferable for G/D RCCI. © 2018 Combustion Institute. All Rights Reserved.