Abstract Utilization of biodiesel which is of renewable in nature was enhanced in single cylinder, 4-S diesel engine based on combustion, performance and emission analysis. Esterified jatropha biodiesel (EJO) at 4%, 10% and 20% was added in normal diesel by v/v ratios to form B04, B10 and B20 blends. The crown surfaces of piston, cylinder head and valves were coated with 250 μm thick mullite material (Metco 6150) to form low heat rejection engine (LHRE). The optimum EJO blend for the conventional engine (CE) as well as LHRE was investigated by comparing their characteristics from all biodiesel blends with the normal diesel of CE operation. B10 was obtained as an optimum blend for both engines. For CE at B10 operation, the CO, HC emissions (except NOx) and brake thermal efficiency (BTE) were reduced as compared with CE at diesel fuel. For LHRE operation, the emissions were further reduced but BTE was slightly reduced. Finally to improve the usability of biodiesel, 5% anhydrous ethanol was added into optimum blend to form E05B10 mixture. Ethanol required higher latent heat for evaporation; this caused reduction of NOx and improved BTE. Emission load on environment (GWP, RIP and TAP) was reduced by optimum blend operation.

中文翻译：

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通过燃烧、性能和排放分析提高生物柴油混合物在低排热柴油发动机中的可用性

摘要 基于燃烧、性能和排放分析，提高了可再生生物柴油在单缸4-S柴油机中的利用。将 4%、10% 和 20% 的酯化麻风树生物柴油 (EJO) 按 v/v 比例添加到普通柴油中，形成 B04、B10 和 B20 混合物。活塞、气缸盖和气门的顶面涂有 250 μm 厚的莫来石材料（Metco 6150），以形成低热排发动机（LHRE）。通过比较所有生物柴油混合物与 CE 操作的正常柴油的特性，研究了传统发动机 (CE) 和 LHRE 的最佳 EJO 混合物。B10 是两种发动机的最佳混合物。对于 B10 运行的 CE，与柴油燃料的 CE 相比，CO、HC 排放（NOx 除外）和制动热效率 (BTE) 降低。对于 LHRE 操作，排放量进一步减少，但 BTE 略有减少。最后为了提高生物柴油的可用性，在最佳混合物中加入5%的无水乙醇，形成E05B10混合物。乙醇需要更高的蒸发潜热；这导致 NOx 的减少和 BTE 的改善。通过优化混合操作，减少了对环境的排放负荷（GWP、RIP 和 TAP）。