【作者】

康佳明，王谦，相英杰，李子烨

【摘要】

采用流体仿真软件CONVERGE开展了基于双直喷策略的低负荷工况下二代生物柴油/汽油活性控制压燃(reactivity controlled compression ignition,RCCI)燃烧模式的数值模拟研究,对比了常规进气道喷射汽油RCCI和双直喷RCCI的燃烧特性,并探讨了双燃料喷射时刻对双直喷RCCI燃烧的影响。结果表明:相比常规进气道喷射汽油RCCI,双直喷RCCI能够有效控制缸内汽油混合气分布,改善不完全燃烧现象;随着汽油直喷时刻的推迟,分层燃烧减弱,燃烧持续期缩短,燃烧效率降低,热效率先减小再增大后又减小,NO_x排放减少而碳烟排放增加;随着二代生物柴油喷射时刻的推迟,分层燃烧加剧,燃烧持续期延长,燃烧效率升高,热效率先增大而后减小,NO_x排放增加而碳烟排放减少。 Numerical simulation of second generation biodiesel/gasoline reactivity controlled compression ignition(RCCI) combustion mode with dual-direct injection strategy at low loads was carried out based on the fluid simulation software CONVERGE. The combustion characteristics of RCCI with dual-direct injection and RCCI with conventional intake port injection were compared, and the effect of dual fuel injection timings on combustion was discussed. The results show that compared with the conventional intake port gasoline injection RCCI, the dual-direct injection RCCI can effectively control the distribution of in-cylinder gasoline mixture and reduceincomplete combustion. With the delay of start of injection(SOI) of gasoline, stratified combustion weakens, combustion duration shortens, combustion efficiency is reduced, indicated thermal efficiency declines first and then increases and finally decreases again, NOx emissions is reduced and soot emissions increases. With the delay of SOI of the second generation biodiesel, stratified combustion intensifies, combustion duration is prolonged, combustion efficiency increases, indicated thermal efficiency increases first and then decreases, NOx emissions rise and soot emissions fall.

【论文集名称】

2020年

【会议名称】

《内燃机工程》

【下载次数】

1

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