预燃室喷油参数对重型柴油机燃烧和排放的影响
Effects of Prechamber Fuel Injection Parameters on Combustion and Emissions of a Heavy-Duty Diesel Engine
数值模拟研究了预燃室式燃烧室中预燃室喷油定时和预燃室喷油角度对重型柴油机燃烧和排放的影响。结果表明：预燃室式燃烧室有提高指示热效率的潜力，部分预燃室方案能够同时降低NOx 和碳烟排放。优化后的方案表明，预燃室产生的持续湍动能扰动使得缸内未燃混合气重新分布，当量比为1 附近混合气增多，燃烧更加充分，同时降低了NOx 和碳烟排放。最终优化方案（预燃室喷油定时0℃A ATDC，预燃室喷油角度为54.5°）：NOx排放减少2.48%，碳烟排放减少21.07%。
A numerical simulation was conducted to investigate the effects of prechamber fuel injection timing and prechamber fuel injection angle on combustion and emissions in a heavy-duty diesel engine with a prechamber combustion chamber. The results showed that the prechamber combustion chamber has the potential to improve indicated thermal efficiency, and certain prechamber configurations can simultaneously reduce NOx and soot emissions. The optimized configuration revealed that the sustained turbulence generated by the prechamber disturbs the distribution of unburned mixture in the cylinder, resulting in an increased abundance of mixture near the stoichiometric ratio, leading to more complete combustion and reduced NOx and soot emissions. The final optimized configuration (prechamber fuel injection timing of 0℃A ATDC and prechamber fuel injection angle of 54.5°) resulted in a 2.48% reduction in NOx emissions and a 21.07% reduction in soot emissions.
陈雨凤;鹿盈盈;张道陈;钟翎丰;裴毅强;
南京工业大学 机械与动力工程学院,江苏南京 211816;南京工业大学 机械与动力工程学院,江苏南京 211816;南京工业大学 机械与动力工程学院,江苏南京 211816;南京工业大学 机械与动力工程学院,江苏南京 211816;天津大学,内燃机燃烧学国家重点实验 室,天津 300072;
TK422
heavy-duty diesel engine prechamber turbulence kinetic energy emissions
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