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首页> 外文期刊>Fuel >Influence of ethanol blends on the combustion performance and exhaust emission characteristics of a four-cylinder diesel engine at various engine loads and injection timings
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Influence of ethanol blends on the combustion performance and exhaust emission characteristics of a four-cylinder diesel engine at various engine loads and injection timings

机译：乙醇混合物对四缸柴油机在不同发动机负荷和喷射正时下的燃烧性能和排气排放特性的影响

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摘要

The aim of this work is to investigate the effect of ethanol blending to diesel fuel on the combustion and exhaust emission characteristics of a four-cylinder diesel engine with a common-rail injection system. The overall spray characteristics, such as the spray tip penetration and the spray cone angle, were studied with respect to the ethanol blending ratio. A spray visualization system and a four-cylinder diesel engine equipped with a combustion and emission analyzer were utilized so as to analyze the spray and exhaust emission characteristics of the ethanol blending diesel fuel. Ethanol blended diesel fuel has a shorter spray tip penetration when compared to pure diesel fuel. In addition, the spray cone angle of ethanol blended fuels is larger. It is believed that the lower fuel density of ethanol blended fuels affects the spray characteristics. When the ethanol blended fuels are injected around top dead center (TDC), they exhibit unstable ignition characteristics because the higher ethanol blending ratio causes a long ignition delay. An advance in the injection timing also induces an increase in the combustion pressure due to the sufficient premixed duration. In a four-cylinder diesel engine, an increase in the ethanol blending ratio leads to a decrease in NO_x emissions due to the high heat of evaporation of ethanol fuel, however, CO and HC emissions increase. In addition, the CO and HC emissions exhibit a decreasing trend according to an increase in the engine load and an advance in the injection timing.
机译：这项工作的目的是研究乙醇混合柴油燃料对具有共轨喷射系统的四缸柴油发动机的燃烧和排放特性的影响。相对于乙醇的混合比例，研究了整体喷雾特性，例如喷嘴的针入度和喷雾锥角。利用喷雾可视化系统和配备有燃烧和排放分析仪的四缸柴油发动机来分析乙醇混合柴油的喷雾和排放特征。与纯柴油相比，乙醇混合柴油具有更短的喷嘴穿透力。另外，乙醇混合燃料的喷雾锥角较大。相信乙醇混合燃料的较低燃料密度会影响喷雾特性。当将乙醇混合燃料喷入上止点（TDC）时，由于较高的乙醇混合比会导致较长的点火延迟，因此它们显示出不稳定的点火特性。由于足够的预混合持续时间，喷射正时的提前还引起燃烧压力的增加。在四缸柴油发动机中，由于乙醇燃料的蒸发高热量，乙醇混合比的增加导致NO_x排放的减少，但是，CO和HC排放增加。另外，随着发动机负荷的增加和喷射正时的提前，CO和HC排放呈现出下降的趋势。

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  • 来源
    《Fuel》 |2011年第2期|p.748-755|共8页
  • 作者

    Su Han Park; In Mo Youn; Chang Sik Lee;

  • 作者单位

    Graduate School of Hanyang University, Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Republic of Korea;

    Graduate School of Hanyang University, Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Republic of Korea;

    Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ethanol blended diesel fuel; exhaust emissions; spray tip penetration; injection timing;

    机译：乙醇混合柴油;尾气排放;喷嘴渗透;注射时间;

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