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首页> 外文期刊>Combustion and Flame >Intermediate temperature heat release in an HCCI engine fueled by ethanol-heptane mixtures: An experimental and modeling study
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Intermediate temperature heat release in an HCCI engine fueled by ethanol-heptane mixtures: An experimental and modeling study

机译:由乙醇/正庚烷混合物提供燃料的HCCI发动机的中间温度放热:一项实验和模型研究

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摘要

This study examines intermediate temperature heat release (ITHR) in homogeneous charge compression ignition (HCCI) engines using blends of ethanol and n-heptane. Experiments were performed over the range of 0-50% n-heptane liquid volume fractions, at equivalence ratios 0.4 and 0.5, and intake pressures from 1.4 bar to 2.2 bar. ITHR was induced in the mixtures containing predominantly ethanol through the addition of small amounts of n-heptane. After a critical threshold, additional n-heptane content yielded low temperature heat release (LTHR). A method for quantifying the amount of heat released during ITHR was developed by examining the second derivative of heat release, and this method was then used to identify trends in the engine data. The combustion process inside the engine was modeled using a single-zone HCCI model, and good qualitative agreement of pre-ignition pressure rise and heat release rate was found between experimental and modeling results using a detailed n-heptane/ethanol chemical kinetic model. The simulation results were used to identify the dominant reaction pathways contributing to ITHR, as well as to verify the chemical basis behind the quantification of the amount of ITHR in the experimental analysis. The dominant reaction pathways contributing to ITHR were found to be H-atom abstraction from n-heptane by OH and the addition of fuel radicals to O_2.
机译:这项研究使用乙醇和正庚烷的混合物研究了均质充量压缩点火(HCCI)发动机中的中间温度放热(ITHR)。在当量比为0.4和0.5且进气压力为1.4 bar至2.2 bar的正庚烷液体体积分数为0-50%的范围内进行实验。通过添加少量正庚烷在主要包含乙醇的混合物中诱导ITHR。达到临界阈值后,其他正庚烷含量会产生低温放热(LTHR)。通过检查热量释放的二阶导数,开发了一种量化ITHR释放热量的方法,然后将该方法用于识别发动机数据中的趋势。使用单区域HCCI模型对发动机内部的燃烧过程进行建模,并使用详细的正庚烷/乙醇化学动力学模型在实验结果和建模结果之间找到了点火前压力升高和放热率的良好定性一致性。模拟结果用于确定促成ITHR的主要反应途径,并在实验分析中验证ITHR定量量化背后的化学基础。发现促成ITHR的主要反应途径是OH从正庚烷中提取H原子,以及向O_2添加燃料自由基。

著录项

  • 来源
    《Combustion and Flame》 |2014年第3期|680-695|共16页
  • 作者单位

    Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia,Department of Mechanical Engineering, University of California at Berkeley, CA, USA;

    University of Zagreb, Croatia;

    Physical and Life Science Directorate, Lawrence Livermore National Laboratory (LLNL), Livermore, CA, USA;

    Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA, USA;

    Physical and Life Science Directorate, Lawrence Livermore National Laboratory (LLNL), Livermore, CA, USA;

    Department of Mechanical Engineering, University of California at Berkeley, CA, USA;

    Department of Mechanical Engineering, University of California at Berkeley, CA, USA;

    Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia;

  • 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
  • 中图分类
  • 关键词

    Chemical kinetic modeling; HCCI engine; Heat release rate; Biofuels;

    机译:化学动力学建模;HCCI发动机;放热率;生物燃料;

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