Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institiute of Science and Technology, Chennai, India.
Department of Mechanical Engineering, Panimalar Engineering College, Chennai, India.
Environ Sci Pollut Res Int. 2018 Jul;25(20):19643-19656. doi: 10.1007/s11356-018-2137-5. Epub 2018 May 7.
The current work focuses on the experimental investigation to analyze the combustion and emission characteristics of a direct injection diesel engine fueled with neat biodiesel (BD100) and different proportions of cyclohexanol blends as a fuel additive in various volume fractions. Cyclohexanol is dispersed into a neat biodiesel in a volume fraction of 10, 20, and 30 vol%. The biodiesel is produced from neem oil by the conventional transesterification process. The experimental results revealed that with the increased cyclohexanol fraction, the combustion was found smooth. The addition of cyclohexanol has a positive influence on various physical and chemical properties of neat biodiesel. The in-cylinder pressure is comparatively low for diesel followed by cyclohexanol and biodiesel blends when compared with neat biodiesel. This is due to shorter ignition delay period. The heat-release rate of neat biodiesel is the highest among all fuels. The overall HC emission of BD70COH30 is 12.19% lower than BD100 and 16.34% lower than diesel. The overall CO emission of BD70COH30 is 13.91% higher than BD100 and 19.5% higher than diesel. The overall NO emission of BD70COH30 is 5.31% lower than BD100 at all load engine operations. The presence of 10, 20, and 30% of cyclohexanol in biodiesel decreased smoke emissions as compared with neat biodiesel and diesel. The overall smoke emission of BD70COH30 is 19.23% lower than BD100 and 25.51% lower than diesel. The overall CO emission of cyclohexanol blended with biodiesel by 30 vol% (BD70COH30) is 17% lower than neat biodiesel and 21.8% lower than diesel. Based on the outcome of this study, neem oil biodiesel and cyclohexanol blends can be employed as a potential alternative fuel for existing unmodified diesel engines owing to its lesser emission characteristics.
当前的工作重点是实验研究，分析在不同体积分数下，以纯生物柴油（BD100）和不同比例环己醇混合物作为燃料添加剂的直喷式柴油机的燃烧和排放特性。环己醇以 10、20 和 30 体积%的比例分散在纯生物柴油中。生物柴油由传统酯交换工艺从印楝油中生产。实验结果表明，随着环己醇分数的增加，燃烧变得更加平稳。环己醇的添加对纯生物柴油的各种物理和化学性质都有积极的影响。与纯生物柴油相比，环己醇和生物柴油混合物的缸内压力相对较低，这是由于较短的点火延迟期。纯生物柴油的放热率在所有燃料中最高。与 BD100 和柴油相比，BD70COH30 的总 HC 排放量降低了 12.19%。与 BD100 和柴油相比，BD70COH30 的总 CO 排放量分别增加了 13.91%和 19.5%。与 BD100 相比，BD70COH30 在所有负荷发动机运行时的总 NO 排放量降低了 5.31%。与纯生物柴油和柴油相比，生物柴油中加入 10、20 和 30%的环己醇降低了烟雾排放。与 BD100 和柴油相比，BD70COH30 的总烟雾排放量降低了 19.23%和 25.51%。与纯生物柴油相比，30 体积%（BD70COH30）的环己醇混合生物柴油的总 CO 排放量降低了 17%，与柴油相比降低了 21.8%。根据这项研究的结果，由于其排放特性较低，印楝油生物柴油和环己醇混合物可以作为现有未修改的柴油机的潜在替代燃料。
