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Heat Transfer in Diesel and Partially Premixed Combustion Engines; A Computational Fluid Dynamics Study

机译：柴油和部分预混燃烧发动机的传热；计算流体动力学研究

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摘要

This article presents findings from a Computational Fluid Dynamics (CFD) study performed on the heat transfer characteristics of diesel and partially-premixed combustion (PPC) engines. The study is confined to the combustion bowl, where numerical simulations have been performed on a part of the engine cycle, namely the compression, combustion, and expansion phases. Three engine geometries were simulated and after validating the results with experimental data, parameter variations were carried out, in order to estimate their effects on the heat transfer, engine performance, and emission levels. The work was performed using a commercial CFD tool, with which only a part of the engine cylinder was modeled, the enclosure of one spray. The results highlight some important characteristic differences between the conventional diesel combustion and the low-temperature combustion scheme PPC. The reduced in-cylinder temperatures for the PPC case lead to a reduced production of NO_x and soot emissions, without compromising the engine performance, only a small penalty in the increased intake air pressure is found. The importance of an appropriate injection strategy was also highlighted, as the presence of a pilot injection during the compression stroke enhanced the temperature stratification in a PPC engine. This leads to reduced heat losses and improved engine efficiency. Finally, the shape of the combustion bowl was shown to have significant effects on both heat losses as well as emission levels.
机译：本文介绍了对柴油机和部分预混合燃烧（PPC）发动机的传热特性进行的计算流体动力学（CFD）研究得出的结论。该研究仅限于燃烧室，在燃烧室中对发动机循环的一部分进行了数值模拟，即压缩，燃烧和膨胀阶段。模拟了三种发动机的几何形状，并在用实验数据验证了结果之后，进行了参数变化，以估计它们对热传递，发动机性能和排放水平的影响。这项工作是使用商用CFD工具进行的，该工具仅对发动机气缸的一部分进行了建模，并封闭了一个喷雾。结果突出显示了常规柴油机燃烧与低温燃烧方案PPC之间的一些重要特性差异。 PPC机壳的降低的缸内温度导致NO_x和烟灰排放的产生减少，而不会损害发动机的性能，但发现进气压力增加的代价很小。还强调了适当喷射策略的重要性，因为压缩冲程期间引燃喷射的存在增强了PPC发动机的温度分层。这样可以减少热量损失并提高发动机效率。最后，燃烧碗的形状对热量损失和排放水平都有重要影响。

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  • 来源
    《Heat Transfer Engineering》 |2017年第18期|1481-1495|共15页
  • 作者

    Helgi Fridriksson; Bengt Sunden; Martin Tuner; OEivind Andersson;

  • 作者单位

    Department of Energy Sciences, Lund University, Lund, Sweden;

    Department of Energy Sciences, Lund University, Lund, Sweden;

    Department of Energy Sciences, Lund University, Lund, Sweden;

    Department of Energy Sciences, Lund University, Lund, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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