中文摘要：

采用新型含氧燃料PODE作为缸内直喷燃料实现PODE/汽油双燃料RCCI燃烧,研究PODE在不同边界条件下对RCCI双燃料燃烧和排放的影响,结合进气门晚关策略进行了大负荷扩展的试验研究。结果表明：相对柴油燃料,PODE作为直喷燃料能够实现更低的烟度排放,同时有效地改善燃烧效率和热效率;降低λ可以有效抑制峰值燃烧速率,而PODE/汽油RCCI的烟度排放对λ不敏感,即便在λ〈1的富油条件下依然可以实现极低的烟度排放,但当量比附近区域会引起CO的恶化;进气门晚关可以降低缸内压力和峰值燃烧速率,但是过于推迟的进气门关闭时刻会导致进气量降低引起NOx的升高;进气门晚关结合高增压实现当量燃烧可以将大负荷范围扩展至2.31 MPa IMEP,同时并未引起有效热效率的显著恶化。

英文摘要：

In the study, experimental investigations on high load extension of PODE/gasoline RCCI operation were conducted in a single-cylinder heavy-duty diesel engine under different boundary conditions using late intake valve closing （LIVC） strategy. The results show that compared to diesel, using PODE as direct injection fuel could achieve much lower smoke emissions with improved combustion efficiency and thermal efficiency. The smoke emissions of PODE/gasoline RCCI is not sensitive to ~, ultra-low smoke could be achieved even under the conditions of fuel rich while reduced Acould suppress the peak heat release rate effectively, however, high CO is observed near the stoichiometric operation. LIVC strategy could reduce in-cylinder pressure and heat release rate, LIVC strategy combined with intake boosting enable the upper load extend to 2.31 MPa IMEP while maintaining relative acceptable indicated thermal efficiency. However, too retarded LIVC timing would lead to the increase of NOx and the deterioration of indicated thermal efficiency.