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Eco-diesel Engine Fueled With Rapeseed Oil Methyl Ester And Ethanol

机译：菜籽油甲酯和乙醇为燃料的生态柴油发动机

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A novel concept of fueling of the diesel engine with biofuels: rapeseed oil methyl ester (RME) and ethanol was proposed, developed, and investigated. The idea of the concept depends on standard fueling with RME and additional injection of ethanol into the inlet port at the inlet valve, which had yet not opened. This enabled ethanol to evaporate and, in the result, filling the cylinder with gaseous mixture of ethanol and air. After ignition from burning RME droplets, the ethanol-air mixture burns very quickly and promotes combustion of main fuel droplets. This results in a shorter combustion period. Experiments were carried out with the use of a one-cylinder direct-injection diesel engine adapted to ethanol injection at three speeds and two loads: low and high and for three injection timings. At each experimental point (i.e., for constant load and speed), and changing quantity of ethanol (proportion of ethanol to RME was changed from zero to the value at which diesel knock occurred). This procedure enabled to find influence of ethanol energy to total fuel energy ratio (Ω_E) on efficiency and emissions (Ω_E was a main independent variable parameter). Considerable decrease of CO_2 and smoke level was obtained and-for high load-also CO and HC emission. At low loads, NO_x emission was reduced. The optimum ratio of ethanol energy to total fuel energy, in terms of brake fuel conversion efficiency and benefit of emission decrease, was found to be about 25%.
机译：提出，开发和研究了一种以生物燃料为柴油发动机提供燃料的新颖概念：菜籽油甲酯（RME）和乙醇。这个概念的想法取决于使用RME进行标准加油以及将乙醇进一步注入到尚未打开的进气阀的进气口中。这使乙醇能够蒸发，从而使乙醇和空气的气态混合物充满气瓶。在燃烧RME液滴燃烧后，乙醇空气混合物燃烧非常迅速，并促进了主要燃料液滴的燃烧。这导致较短的燃烧时间。实验是使用单缸直喷柴油发动机进行的，该柴油发动机适合于以三种速度和两种负载（低速和高速）以及三种喷射正时进行乙醇喷射。在每个实验点（即，对于恒定的负载和速度），改变乙醇的量（乙醇对RME的比例从零变为发生柴油爆震的值）。该程序能够发现乙醇能量与总燃料能量之比（Ω_E）对效率和排放的影响（Ω_E是主要的独立变量参数）。获得了CO_2和烟气水平的显着降低，并且对于高负荷，还获得了CO和HC排放。在低负荷下，减少了NO_x排放。就制动燃料转化效率和排放减少的益处而言，发现乙醇能量与总燃料能量的最佳比例为约25％。

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