论文部分内容阅读
从柴油机燃烧过程控制的思想出发,解释了高密度-低温燃烧概念的内涵.数值模拟结果表明,高充量密度在提高热容方面与EGR具有相同的作用.因此,低温燃烧使用较低的EGR率时就能实现很低的NOx和碳烟排放;另外,高充量密度促进了燃空混合率,特别是促进了燃烧后期的混合速率,极大地缩短了燃烧持续期,提高了指示热效率,高密度-低温燃烧的这一特征对柴油机高负荷和全负荷下实现高效、低排放运行具有突出的优势.研究结果还显示,充量密度对燃烧过程参数的影响是多重的,不同于传统柴油机燃烧.
The concept of high-density-low-temperature combustion is explained from the idea of diesel combustion process control. The numerical simulation results show that high-charge density plays the same role as EGR in increasing heat capacity. Therefore, low-temperature combustion uses a lower EGR In addition, the high charge density promotes the combustion-air mixing rate, especially the post-combustion mixing rate, greatly shortens the combustion duration and improves the indicated thermal efficiency, This feature of high density and low temperature combustion has outstanding advantages for high efficiency and low emission operation of diesel engine under high load and full load.The results also show that the effect of charge density on combustion process parameters is multiple, different from the traditional diesel engine combustion.