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首页> 外文期刊>Energy & fuels >Effects of Bioethanol-Blended Diesel Fuel on Combustion and Emission Reduction Characteristics in a Direct-Injection Diesel Engine with Exhaust Gas Recirculation (EGR)
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Effects of Bioethanol-Blended Diesel Fuel on Combustion and Emission Reduction Characteristics in a Direct-Injection Diesel Engine with Exhaust Gas Recirculation (EGR)

机译：掺有生物乙醇的柴油对带有废气再循环（EGR）的直喷式柴油机燃烧和排放特性的影响

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The aim of this investigation is to clarify the effects of bioethanol on the combustion and exhaust emission characteristics, as well as the spray and atomization characteristics of bioethanol-diesel blended fuels in a single-cylinder diesel engine. The spray and exhaust emission characteristics are analyzed using the spray visualization system, the droplet analysis measuring system, and the single-cylinder diesel engine with an exhaust emission analyzer. In addition, the effects of exhaust gas recirculation (EGR) on the emission characteristics are also investigated. In the analysis of the experimental results for the spray characteristics, it revealed that the spray tip penetration of bioethanol-blended diesel fuel shows almost similar behavior compared to a pure diesel fuel and the blended fuels show a wide spray cone angle, before the impingement to the piston bowl wall. In the case of the bioethanol blends, the mean reduction percentage of the droplet size increases as the bioethanol blending ratio increases when compared to the droplet size of a pure diesel fuel. In the results of combustion and exhaust emissions, the increased bioethanol blending ratio extends the ignition delay because of the low cetane number and the reduction of the cylinder temperature by the evaporation of bioethanol with high latent heat. The application of EGR induces the extension of the ignition delay and lowers both the peak combustion pressure and the peak rate of heat release (ROHR). The blending of bioethanol with diesel fuel causes a small decrease in soot emissions. Also, the use of EGR and blending bioethanol with diesel fuel can reduce nitrogen oxide (NO_x) emissions. However, increasing the bioethanol blending ratio causes hydrocarbon (HC) emissions to increase.
机译：这项研究的目的是弄清生物乙醇对单缸柴油机中燃烧和废气排放特性以及生物乙醇-柴油混合燃料的喷雾和雾化特性的影响。使用喷雾可视化系统，液滴分析测量系统以及带废气排放分析仪的单缸柴油机分析喷雾和废气排放特性。此外，还研究了废气再循环（EGR）对排放特性的影响。在对喷雾特性的实验结果进行分析时，发现与纯柴油相比，掺混生物乙醇的柴油的喷嘴尖端表现出几乎相似的行为，而混合燃料则呈现出较宽的喷雾锥角，而后撞击活塞碗壁。在生物乙醇共混物的情况下，与纯柴油燃料的液滴尺寸相比，随着生物乙醇共混比的增加，液滴尺寸的平均减少百分比增加。在燃烧和废气排放的结果中，由于十六烷值低以及由于高潜热蒸发生物乙醇而降低了气缸温度，增加了生物乙醇的混合比，延长了点火延迟。 EGR的应用引起点火延迟的延长，并降低了峰值燃烧压力和峰值放热率（ROHR）。生物乙醇与柴油燃料的混合会导致烟尘排放量的小幅下降。同样，使用EGR并将生物乙醇与柴油燃料混合可以减少氮氧化物（NO_x）的排放。但是，增加生物乙醇混合比会导致碳氢化合物（HC）排放量增加。

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