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Numerical study on spray and combustion characteristics of diesel and soy-based biodiesel in a CI engine

机译：CI发动机中柴油和大豆基生物柴油的喷雾和燃烧特性的数值研究

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摘要

This study is to investigate spray, combustion and emission characteristics of mixtures of diesel and soy-based biodiesel in a CI engine. A surrogate mechanism is developed by combining the skeletal mechanisms of methyl butanoate and n-heptane. Thermophysical properties are validated against measured tip penetrations and Sauter mean diameters (SMDs) of nonreacting sprays. Biodiesel shows spray characteristics of larger SMD's, lower volatility and slower mixing with ambient air due to larger viscosity and surface tension. Engine simulation is performed by the CMC-ISR model to resolve coupling between chemistry and turbulence. There is no noticeable difference in ignition delays of diesel and biodiesel, while flame propagates slower with slower evaporation and mixing for biodiesel. Results are in good agreement for pressure traces, NO_x and trends of variation of CO and PM in a range of operating conditions. NO_X decreased for BD ＜ 60% and increased for BD ＞ 60% with increasing biodiesel fraction, while PM and CO decreased due to the oxygen content in biodiesel in the test engine.
机译：这项研究旨在研究CI发动机中柴油和大豆基生物柴油混合物的喷雾，燃烧和排放特性。通过结合丁酸甲酯和正庚烷的骨架机理来开发替代机制。针对未反应喷雾的测得的针尖穿透力和Sauter平均直径（SMD），验证了热物理性质。由于更大的粘度和表面张力，生物柴油显示出较大SMD的喷雾特性，较低的挥发性以及与环境空气的混合较慢。通过CMC-ISR模型执行发动机仿真，以解决化学反应和湍流之间的耦合。柴油和生物柴油的点火延迟没有明显差异，而生物柴油的火焰传播更慢，蒸发和混合更慢。在一系列操作条件下，压力迹线，NO_x以及CO和PM的变化趋势的结果非常吻合。随着生物柴油比例的增加，BD ＜60％的NO_X降低，BD＞ 60％的NO_X升高，而PM和CO则由于测试引擎中生物柴油中的氧含量而降低。

著录项

  • 来源
    《Fuel》 |2013年第11期|537-545|共9页
  • 作者

    Youngjae Lee; Kang Y. Huh;

  • 作者单位

    Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang Gyungbuk 790-784, Republic of Korea;

    Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang Gyungbuk 790-784, 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

    Diesel; Biodiesel; Spray; Conditional moment closure (CMC); Biodiesel surrogate;

    机译：柴油机;生物柴油喷雾;有条件的力矩闭合（CMC）;生物柴油替代品;

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