The demand for renewable energy sources is gradually escalating due to the spontaneously growing population and global economic development. The access to fossil fuels is gradually declining due to the limited available reserves. Hence, renewable energy resources, technology choice, and energy policy are always being revised due to the modernization of society. Meanwhile, the liquid energy sources such as methyl ester from locally produced vegetable oils are readily accepted by many countries globally, although it is currently being blended (up to 20%) with diesel. Oxides of nitrogen are the most substantial emissions from diesel engines produced due to high combustion temperature. The addition of alcohol in the fuel reduces the NO formation since alcohols have high latent heat of evaporation. The present study’s primary purpose is to investigate the effect of different alcohol types on engine performance and emission characteristics. For this purpose, seven test fuels and neat diesel were used. The test fuels P20 (20% palm biodiesel with 70% neat diesel and 10% alcohol on a volume basis), PE, PPr, PB, PPe, PH were prepared and tested on a single-cylinder, 4-stroke, DI-diesel engine at different speeds at 100 % load. The P20E10 ternary fuel blend illustrated the most practical combination of all the bioethanol-based blends, which considerably improves the BTE, BSFC and reduces NOformation at high speed compared to other types of alcoholic fuel blends. Also, the P20E10 fuel blend improved the cloud point of neat diesel.

中文翻译：

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伯醇和仲醇作为含氧添加剂对柴油机性能和排放特性的影响

由于人口自发增长和全球经济发展，对可再生能源的需求逐渐升级。由于可用储量有限，化石燃料的获取正在逐渐减少。因此，可再生能源资源、技术选择和能源政策总是随着社会的现代化而不断修订。与此同时，来自当地生产的植物油的甲酯等液体能源很容易被全球许多国家所接受，尽管目前它与柴油混合（高达20%）。氮氧化物是柴油发动机由于燃烧温度高而产生的最主要的排放物。由于醇具有较高的蒸发潜热，因此在燃料中添加醇可减少 NO 的形成。本研究的主要目的是研究不同酒精类型对发动机性能和排放特性的影响。为此，使用了七种测试燃料和纯柴油。测试燃料 P20（按体积计算，20% 棕榈生物柴油、70% 纯柴油和 10% 酒精）、PE、PPr、PB、PPe、PH 在单缸、四冲程 DI 柴油机上制备和测试发动机在 100% 负载下的不同转速。P20E10 三元燃料混合物展示了所有生物乙醇基混合物中最实用的组合，与其他类型的酒精燃料混合物相比，它显着改善了 BTE、BSFC 并减少了高速时的 NO 形成。此外，P20E10 混合燃料还改善了纯柴油的浊点。