Recently, applying biodiesel as an alternative fuel to improve the combustion stability in combination with implementing exhaust gas recirculation (EGR) to bring in-cylinder temperature under control has come under focus. Exergy analysis deals with the energy lost because of the irreversibilities and heat transfer across the combustion chamber. The present study investigates the effect of the various EGR amounts and temperatures on diesel/biodiesel combustion in a turbocharged direct injection diesel engine from the exergy analysis standpoint. The employed biodiesel percentages are considered at two levels, 0 and 20% (i.e., B0 and B20). The rates of EGR amount are 0, 5, 10, 13, and 20%, which are inducted into the combustion chamber at various temperatures of 370, 395, 575, 735, and 825 K. The results revealed that the higher EGR implementation at higher temperature had reduced the accumulative (acc) work and fuel burn exergies as well as irreversibility. In contrast, the total fuel and acc heat loss exergies are increased. The maximum and minimum acc exergy losses are detected for B0-EGR20-835 K and B0-EGR5-370 K, respectively.

中文翻译：

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柴油/生物柴油为燃料的直喷柴油机中各种废气再循环温度和数量对火用项影响的模拟研究

近来，将生物柴油作为替代燃料以提高燃烧稳定性并结合实施废气再循环（EGR）来控制缸内温度已成为人们关注的焦点。火用分析处理由于不可逆性和穿过燃烧室的热传递而损失的能量。本研究从火用分析的角度研究了各种 EGR 量和温度对涡轮增压直喷柴油发动机中柴油/生物柴油燃烧的影响。使用的生物柴油百分比被认为是两个水平，0 和 20%（即 B0 和 B20）。EGR 量的比率为 0、5、10、13 和 20%，它们在 370、395、575、735 和 825 K 的各种温度下被引入燃烧室。结果表明，在较高温度下实施较高的 EGR 减少了累积 (acc) 功和燃料燃烧能量以及不可逆性。相比之下，总燃料和加速热损失会增加。分别针对 B0-EGR20-835 K 和 B0-EGR5-370 K 检测到最大和最小加速能量损失。