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Effect of compression ratio on combustion, performance, and emission characteristics of compression ignition engine fueled with palm (B20) biodiesel blend

机译:压缩比对棕榈(B20)生物柴油掺混燃料压燃式发动机燃烧,性能和排放特性的影响

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Limited fossil fuel reserves led to focus on alternatives fuels for combustion engines. Several studies reported optimal (20%) biodiesel blend for utility in compression ignition engine at constant compression ratio. Literature lacks on the study of palm-based biodiesel in blended form at varying engine compression ratios. In this study, an initiative was undertaken to study the effect of variable compression ratio (16:1, 17:1 and 18:1) on various engine characteristics by fuelling 20% palm biodiesel blending compression ignition engine. The ignition delay period decreased, whereas the peak cylinder pressure and brake thermal efficiency increased with increase in the engine compression ratio from 16:1 to 18:1. At 3.5 bar bmep, brake thermal efficiency values were observed to be 28.9, 30.8 and 33.8% at 16:1, 17:1 and 18:1 CRs, respectively in B20 fuel. Moreover, increasing compression ratio from 16:1 to 18:1, the average reduction in emissions of hydrocarbon, carbon monoxide and smoke opacity were observed to be 47.8, 41.0 and 35.7%, respectively whereas, oxides of nitrogen emissions increased by 41.1%. Thus, it is inferred that B20 fuel performed well at high engine compression ratio. (C) 2019 Elsevier Ltd. All rights reserved.
机译:化石燃料储量有限,导致人们专注于内燃机的替代燃料。几项研究报告了在恒定压缩比下可用于压缩点火发动机的最佳(20%)生物柴油混合物。文献中缺乏以可变的发动机压缩比混合形式的棕榈基生物柴油的研究。在这项研究中,采取了一项举措来研究通过为20%的棕榈生物柴油混合压缩点火式发动机加油,可变压缩比(16:1、17:1和18:1)对各种发动机特性的影响。随着发动机压缩比从16:1增加到18:1,点火延迟时间减少,而峰值气缸压力和制动热效率增加。在3.5 bar bmep的情况下,在B20燃料中的CRs为16:1、17:1和18:1时,制动热效率值分别为28.9、30.8和33.8%。此外,将压缩比从16:1增加到18:1,观察到的碳氢化合物,一氧化碳和烟气不透明度的平均减少分别为47.8、41.0和35.7%,而氮氧化物的排放增加了41.1%。因此,可以推断出B20燃料在高发动机压缩比下表现良好。 (C)2019 Elsevier Ltd.保留所有权利。

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