Abstract

An experimental study was conducted to evaluate the impacts of using cottonseed methyl ester as an additive into neat diesel fuel on the combustion, performance, vibration and noise characteristics of a single-cylinder, direct injection diesel engine at a constant engine speed (1500 rpm) and under different engine loads (2.5, 5, 7.5 and 10 Nm). B₁₀, B₂₀ and B₅₀ fuel blends were prepared as the working fuels and compared to B₀ reference fuel (neat diesel fuel) in the study. The results indicated that the lowest average vibration value was also obtained in B₂₀ type fuel. It was observed that cottonseed methyl ester due to the high oxygen content improved the quality of combustion process. Additionally, the high viscosity value of the used biodiesel increased the ignition delay by adversely affecting the atomisation, evaporation and mixing ratio of the fuels. On the other hand, BSFC increased with the increment of the biodiesel ratio in the blends i.e. the maximum BSFC was observed in B50 fuel type. In all fuel blends except for B₅₀ type, IP_max values were achieved higher than B₀ for each engine load. In conclusion, the experimental results clearly reported that the presence of cottonseed methyl ester in the blends can alternatively be substituted for the neat diesel fuel without any modifications in diesel engines.

摘要

进行了一项实验研究，以评估在纯柴油燃料中使用棉籽甲酯作为添加剂对单缸直喷柴油发动机在恒定转速（1500 rpm）下的燃烧、性能、振动和噪声特性的影响。并在不同的发动机负载（2.5、5、7.5 和 10 Nm）下。B ₁₀、B ₂₀和 B ₅₀燃料混合物被制备为工作燃料，并在研究中与 B ₀参考燃料（纯柴油燃料）进行比较。结果表明，在 B _{20中也获得了最低的平均振动值}型燃料。据观察，由于含氧量高，棉籽甲酯提高了燃烧过程的质量。此外，所用生物柴油的高粘度值通过不利地影响燃料的雾化、蒸发和混合比而增加了点火延迟。另一方面，BSFC随着混合物中生物柴油比例的增加而增加，即在B50燃料类型中观察到最大BSFC。在除 B ₅₀类型之外的所有混合燃料中，IP_最大值均高于 B ₀对于每个发动机负载。总之，实验结果清楚地表明，混合物中存在的棉籽甲酯可以替代地替代纯柴油燃料，而无需对柴油发动机进行任何修改。