Abstract In this study, retarded injection timing was investigated to overcome higher NOx emissions of a direct injection diesel engine fueled with diesel fuel (90%)/canola biodiesel (10%) blend. The experiments were performed at the maximum torque speed (2200 rpm) under four loads (3.75 Nm, 7.5 Nm, 11.25 Nm and 15 Nm) and three injection timings (original −28 °CA, 26 °CA and 24 °CA bTDC). The effects of the retarded fuel injection timings on the performance, the emissions and the combustion were examined in detail. The changes in the cylinder pressure, the combustion timing, the heat release rate, the fractions and the durations of premixed and diffusion combustion phases, the injection and the ignition delays, NOx, total hydrocarbon, CO, CO2, smoke, break specific fuel consumption and break thermal efficiency were determined and presented in the paper. The experimental results showed that the injection retardation of 2 °CA could satisfy lower NOx and break specific fuel consumptions without significant adverse effects on the other engine parameters, while the further retarding of the injection timing deteriorated the parameters. The retarded injection timing of 2 °CA provided decreases in NOx up to 11% and in BSFC up to 2.7%.

中文翻译：

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延迟喷油正时对双低油菜生物柴油柴油机燃烧和排放的影响

摘要 在这项研究中，延迟喷射正时进行了研究，以克服以柴油 (90%)/双低油菜生物柴油 (10%) 混合物为燃料的直喷柴油发动机的较高 NOx 排放。实验在四个负载（3.75 Nm、7.5 Nm、11.25 Nm 和 15 Nm）和三个喷射正时（原始 -28°CA、26°CA 和 24°CA bTDC）下以最大扭矩速度（2200 rpm）进行。详细检查了延迟燃油喷射正时对性能、排放和燃烧的影响。气缸压力的变化、燃烧正时、放热率、预混和扩散燃烧阶段的分数和持续时间、喷射和点火延迟、NOx、总碳氢化合物、CO、CO2、烟雾、确定并在论文中介绍了断路比燃料消耗和断路热效率。实验结果表明，喷射延迟2°CA可以满足较低的NOx并打破比燃料消耗，而对其他发动机参数没有显着的不利影响，而进一步延迟喷射正时会使参数恶化。2°CA 的延迟喷射正时使 NOx 减少高达 11%，BSFC 减少高达 2.7%。