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首页> 外文期刊>Journal of Energy Engineering >Comparative Evaluation of Two Straight Vegetable Oils and Their Methyl Ester Biodiesels as Fuel Extenders in HDDI Diesel Engines: Performance and Emissions
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Comparative Evaluation of Two Straight Vegetable Oils and Their Methyl Ester Biodiesels as Fuel Extenders in HDDI Diesel Engines: Performance and Emissions

机译：HDDI柴油机中两种直馏植物油及其甲基酯生物柴油作为燃料增量剂的比较评估：性能和排放

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摘要

The present work evaluates the effects of using blends of diesel fuel with two (straight) vegetable oils, viz sunflower and cottonseed, and their corresponding methyl ester biodiesels in proportions of 10% and 20% (by volume), on the performance and emissions of a fully instrumented, six-cylinder, turbocharged and after-cooled, heavy-duty direct injection (HDDI), Mercedes-Benz, bus diesel engine. The series of tests are conducted using each of the biofuels blends, with the engine working at (the same) three loads and two speeds, with measurements taken of fuel consumption and exhaust regulated emissions, i.e., smoke, nitrogen oxides (NO_x), carbon monoxide (CO), and total unburned hydrocarbons (HC). Results of heat release combustion analysis of experimentally obtained cylinder pressure diagrams, together with the differing physical and chemical properties of these biofuels against those for the diesel fuel, which constitutes the baseline fuel, aid the correct interpretation of the observed engine behavior. With increasing percentage of all biofuels in the blends, reduction of smoke opacity (higher for the cottonseed oil or its biodiesel against their sunflower counterparts) is observed, slight increase of NO_x, increase of HC emissions, increase of CO with the vegetable oil blends, and decrease with the biodiesel ones, while brake thermal efficiency remains practically the same.
机译：本工作评估了将柴油与两种（直的）植物油（即葵花籽和棉籽）及其相应的甲酯生物柴油（按体积计）的比例混合使用的混合燃料对柴油机性能和排放的影响，混合比例为10％和20％。配备齐全的六缸涡轮增压后冷重型直喷（HDDI）奔驰巴士柴油发动机。使用每种生物燃料混合物进行一系列测试，发动机以（相同）三种负载和两种速度工作，并测量了燃料消耗量和废气调节排放量，例如烟，氮氧化物（NO_x），碳一氧化碳（CO）和总未燃碳氢化合物（HC）。实验获得的气缸压力图的放热燃烧分析结果，以及这些生物燃料相对于构成基准燃料的柴油的不同物理和化学特性，有助于正确解释观察到的发动机性能。随着混合物中所有生物燃料百分比的增加，观察到烟的不透明度降低（棉籽油或其生物柴油相对于葵花籽而言更高），NO_x略有增加，HC排放量增加，植物油混合物中的CO含量增加，与生物柴油相比有所降低，而制动器的热效率实际上保持不变。

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