Abstract There are several abatement technologies used for emissions, especially NOx emissions, from Diesel engines. Exhaust Gas Recirculation (EGR) system and alternative blend fuels are leading among the common methods used. Although the EGR provides remarkable reduction in NOx emissions, has negative effects on other emissions and engine performance. Among the alternative fuels, biodiesel and ethanol are preferred for being renewable. Chemical properties make these fuels feasible to be used in diesel blends at various ratios. Utilizing these fuels with diesel fuel in blends on engines provide improvements in engine performance parameters and emissions characteristics. However, biodiesels with oxygen content increase NOx emissions in particular. Eventually, utilizing different methods together is beneficial to optimize for the most convenient utilization ratios and conditions regarding all the emissions from engine. In this study, utilizing supercharging, EGR, biodiesel at various ratios and introducing ethanol fumigation through intake manifold of a DI diesel, and the most convenient engine operation conditions and ratios of the factors are determined through optimization using Taguchi method regarding engine brake specific heat consumption and emissions. Experiments are conducted regarding to orthogonal series L16 (42 × 22) with the combinations of factor and levels. Effect degrees of factors are determined through variation analysis. As a conclusion, factors evaluated in combination under different engine operating conditions, and factors and levels minimizing brake specific heat consumption and emissions, NO, smoke, HC, CO and CO2, are stated.

中文翻译：

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增压、EGR、生物柴油和乙醇对柴油机排放的综合影响：优化策略建议

摘要 有几种减排技术用于柴油发动机的排放，尤其是氮氧化物排放。废气再循环 (EGR) 系统和替代混合燃料是常用的方法之一。尽管 EGR 显着减少了 NOx 排放，但对其他排放和发动机性能有负面影响。在替代燃料中，生物柴油和乙醇是可再生的。化学特性使这些燃料能够以各种比例用于混合柴油。将这些燃料与柴油燃料混合用于发动机可改善发动机性能参数和排放特性。然而，含氧量的生物柴油尤其会增加 NOx 排放。最终，将不同的方法结合使用，有利于优化发动机所有排放的最方便的利用率和条件。本研究利用增压、EGR、各种比例的生物柴油，通过DI柴油的进气歧管引入乙醇熏蒸，通过田口方法对发动机制动比热耗进行优化，确定最方便的发动机运行工况和各因素的比值。和排放。对具有因子和水平组合的正交序列 L16 (42 × 22) 进行了实验。通过变异分析确定因素的影响程度。作为结论，在不同发动机工况下综合评估的因素，