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Development of a reduced biodiesel combustion kinetics mechanism for CFD modelling of a light-duty diesel engine

机译:开发用于轻型柴油机CFD建模的减少生物柴油燃烧动力学机理

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摘要

A reduced chemical kinetics mechanism has been developed and validated under zero-dimension and multi-dimensional engine simulations for a range of engine operating conditions and types of biodiesel fuel. The mechanism is first constructed by reducing a detailed MB/MB2D mechanism consisting of 301 species and 1516 reactions to 77 species and 212 reactions. The ignition delay periods and temporal evolutions of important species are in good agreement with those produced using detailed kinetics. The reduced mechanism is then combined with a skeletal modified n-heptane mechanism to account for actual biodiesel energy content and molecular structure when fuel blends are introduced. Two additional global reactions are also included to cater for the change in ratio between saturated and unsaturated methyl esters in the fuels. The combined mechanism (BOS-V2) consists of 113 species and 399 reactions with integrated nitrogen oxides (NCy reaction kinetics. This mechanism is then further validated using OpenFOAMr for the computational fluid dynamics (CFD) engine simulations. Here, neat and B50 blends of coconut, palm and soy methyl esters are used. Good agreements in ignition delay, peak pressure, pressure trace, heat-release profile and emission trends are achieved between experimental and predicted data for all the tested fuels and engine operating conditions. The results show that the proposed mechanism gives reliable predictions of in-cylinder combustion and emission processes.
机译:在零维和多维发动机模拟下,针对一系列发动机工况和生物柴油燃料类型,已经开发并验证了降低的化学动力学机理。首先通过将详细的MB / MB2D机制(由301种和1516种反应组成)减少到77种和212种反应来构建该机制。重要物质的点火延迟期和时间演化与使用详细动力学所产生的延迟时间和时间演化非常一致。然后,将还原的机理与骨架改性的正庚烷机理结合起来,以考虑引入燃料混合物时实际的生物柴油能量含量和分子结构。还包括两个额外的全局反应,以适应燃料中饱和和不饱和甲酯之间的比率变化。组合机理(BOS-V2)由113种反应和399个反应与整合的氮氧化物(NCy反应动力学)组成,然后使用OpenFOAMr对该机理进行了进一步验证,以进行计算流体动力学(CFD)发动机模拟。使用椰子,棕榈和大豆甲酯,在所有测试燃料和发动机工况的实验数据和预测数据之间,点火延迟,峰值压力,压力曲线,放热曲线和排放趋势均取得了良好的一致性。所提出的机制给出了缸内燃烧和排放过程的可靠预测。

著录项

  • 来源
    《Fuel》 |2013年第4期|388-400|共13页
  • 作者单位

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;

    Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;

  • 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 reaction kinetics; CFD; emissions; reduced mechanism; spray combustion;

    机译:生物柴油反应动力学;差价合约排放简化机制;喷雾燃烧;

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