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Investigation of the chemical kinetics process of diesel combustion in a compression ignition engine using the large eddy simulation approach

机译：使用大涡模拟方法对压缩点火发动机柴油燃烧化学动力学过程的研究

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摘要

This work investigated the chemical kinetics processes of diesel combustion under compression ignition combustion conditions using the large eddy simulation approach. An overall reasonable agreement with the experimental combustion results was obtained. To further investigate the combustion details, a data-processing method was adopted to calculate and identify the representative reactions for the species consumption and heat release in each computational cell. It was found that during the initial ignition period, the combustion domain was primarily composed of three combustion regions, including the upstream exothermic region (Region 1), upstream endothermic region (Region 2), and downstream exothermic region (Region 3). The exothermic heat release in Region 1 and endothermic heat release in Region 2 were both dominated by the reaction C7H15O2-2 = C7H15-2 + O-2, while Region 3 was dominated by the reaction HCO + O-2 = CO + HO2, which laid the foundation for the further intense heat release process. The exhaust gas recirculation (EGR) has a significant effect on the heat release feature during the diffusion combustion process. For the high EGR case, the endothermic heat release was dominated by the reactions OH + H-2 = H + H2O and C2H3 ( + M) = C2H2 + H ( + M), rather than by the reaction C7H15O2-2 = C7H15-2 + O-2 as at the low EGR rate.
机译：该作品研究了使用大涡模拟方法在压缩点火燃烧条件下柴油燃烧的化学动力学过程。获得了与实验燃烧结果的总体合理协议。为了进一步研究燃烧细节，采用数据处理方法来计算和鉴定每个计算细胞中物种消耗和热释放的代表性反应。发现在初始点火周期期间，燃烧结构域主要由三个燃烧区组成，包括上游放热区域（区域1），上游吸热区域（区域2）和下游放热区域（区域3）。区域2中的放热热释放和区域2中的吸热释放均由反应C7H15O2-2 = C7H15-2 + O-2主导，而区域3由反应HCO + O-2 = CO + HO2主导，这为进一步强烈的热释放过程奠定了基础。废气再循环（EGR）对扩散燃烧过程中的热释放特征具有显着影响。对于高EGR案例，吸热热释放由反应OH + H-2 = H + H 2 O和C 2 H 3（+ M）= C 2 H 2 + H（+ M）来支配，而不是通过反应C7H15O2-2 = C7H15- 2 + O-2以低EGR率。

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  • 来源
    《Fuel》 |2020年第15期|117544.1-117544.14|共14页
  • 作者

    Liu Xinlei; Wang Hu; Yao Mingfa;

  • 作者单位

    Tianjin Univ State Key Lab Engines 92 Weijin Rd Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines 92 Weijin Rd Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines 92 Weijin Rd Tianjin 300072 Peoples R China;

  • 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

    Large eddy simulation; Diesel; Compression ignition; Soot; Chemical kinetics; EGR;

    机译：大涡模拟;柴油;压缩点火;烟灰;化学动力学;EGR;

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