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A skeletal mechanism for biodiesel blend surrogates combustion

机译：生物柴油共混物的骨架机制可替代燃烧

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摘要

A tri-component skeletal reaction mechanism consisting of methyl decanoate, methyl-9-decenoate, and n-heptane was developed for biodiesel combustion in diesel engine. It comprises 112 species participating in 498 reactions with the CO, NO_x and soot formation mechanisms embedded. In this study, a detailed tri-component biodiesel mechanism was used as the start of mechanism reduction and the reduced mechanism was combined with a previously developed skeletal reaction mechanism for n-heptane to integrate the soot formation kinetics. A combined mechanism reduction strategy including the directed relation graph with error propagation and sensitivity analysis (DRCEPSA), peak concentration analysis, isomer lumping, unimportant reactions elimination and reaction rate adjustment methods was employed. The reduction process for biodiesel was performed over a range of initial conditions covering the pressures from 1 to 100 atm, equivalence ratios from 0.5 to 2.0 and temperatures from 700 to 1800 K, whereas for n-heptane, ignition delay predictions were compared against 17 shock tube experimental conditions. Extensive validations were performed for the developed skeletal reaction mechanism with 0-D ignition delay testing and 3-D engine simulations. The results indicated that the developed mechanism was able to accurately predict the ignition delay timings of n-heptane and biodiesel, and it could be integrated into 3-D engine simulations to predict the combustion characteristics of biodiesel. As such, the developed 112-species skeletal mechanism can accurately mimic the significant reaction pathways of the detailed reaction mechanism, and it is suitable to be used for diesel engine combustion simulations fueled by biodiesel, diesel and their blend fuels.
机译：针对柴油发动机生物柴油的燃烧，开发了由癸酸甲酯，-9-癸烯酸甲酯和正庚烷组成的三组分骨架反应机理。它包含112种物种，参与了498次反应，其中嵌入了CO，NO_x和烟灰形成机制。在这项研究中，详细的三组分生物柴油机理被用作还原机理的开始，并且还原机理与先前开发的正庚烷骨架反应机理相结合，以整合烟灰形成动力学。采用了组合的机理简化策略，包括带有误差传播和敏感性分析的定向关系图（DRCEPSA），峰浓度分析，异构体成团，不重要的反应消除和反应速率调节方法。生物柴油的还原过程是在一系列初始条件下进行的，这些条件涵盖了从1到100 atm的压力，当量比从0.5到2.0以及温度从700到1800 K，而对于正庚烷，则将点火延迟预测与17冲击进行了比较管的实验条件。对开发的骨骼反应机制进行了广泛的验证，包括0-D点火延迟测试和3-D发动机模拟。结果表明，所开发的机理能够准确预测正庚烷和生物柴油的点火延迟正时，并且可以将其集成到3-D发动机仿真中以预测生物柴油的燃烧特性。这样，已开发的112种骨骼机制可以准确地模仿详细反应机制的重要反应路径，并且适用于以生物柴油，柴油及其混合燃料为燃料的柴油发动机燃烧模拟。

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  • 来源
    《Energy Conversion & Management》 |2014年第5期|51-59|共9页
  • 作者

    H. An; W.M. Yang; A. Maghbouli; J. Li; K.J. Chua;

  • 作者单位

    Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore;

    Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore;

    Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore;

    Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore;

    Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore;

  • 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

    Biodiesel; Skeletal mechanism; Mechanism reduction; Simulation; Emissions;

    机译：生物柴油骨骼机制;减少机制;模拟;排放物;

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