摘要
建立了一维发动机工作循环耦合单区化学动力学模型,对生物柴油-乙醇双燃料均质压燃燃烧特性进行了模拟研究,并对比了纯生物柴油和不同比例乙醇-生物柴油混合燃料的燃烧以及排放特性,结果表明:混合燃料的压力、温度、放热率峰值都由于乙醇的加入降低,并且冷焰点火时刻和高温点火时刻明显推后;乙醇在混合燃料中的比例达到40%时HCCI发动机的最大负荷从2.1MPa拓展到3.0MPa,并且在大负荷指示热效率和燃烧效率都显著提高;CO在小负荷排放较高,并随着乙醇比例的增加而升高,在大负荷时CO排放较低;乙醇的加入可以降低CO_2、NO_x的排放。
A numerical simulation study on combustion character of HCCI with the dual fuel of biodiesel-alcohol was performed by establishing single-zone chemical kinetics model coupled with onedimensional engine working cycle, and the combustion and emission character of the pure biodiesel with biodiesel-alcohol dual fuel of different proportion were compared. The results show that, the mixed fuel combustion pressure, temperature, and the peak value of heat release rate are all reduced because of the mixed alcohol, and the ignition time of cool flame and main flame are constantly retarded with the increase of the alcohol proportion in dual fuel. When the alcohol proportion in dual fuel reach 40%, the larger HCCI engine load expands from 2.1MPa to 3MPa, the indicated thermal efficiency and the combustion efficiency are also improved markedly. The CO emission is higher for low load, and rises with the increase of alcohol proportion, while it is lower for high load. What＇s more,mixed alcohol could reduce the CO2 and NOx emission.
出处
《柳州职业技术学院学报》
2016年第2期50-57,共8页
Journal of Liuzhou Vocational & Technical College
基金
2015年广西高校科学技术研究立项项目(KY2015LX637)
