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An experimental and reduced modeling study of the laminar flame speed of jet fuel surrogate components

机译：喷气燃料替代物组件层流火焰速度的实验和简化建模研究

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摘要

The laminar flame speed is an essential combustion parameter used in the validation of chemical kinetic mechanisms. In recent years, mechanisms tailored for jet fuel surrogate components have been partially validated using the laminar flame speeds of pure components, which were derived using both linear and non-linear extrapolation techniques. However, there remain significant deviations between the results from different studies that motivate further investigation. In this study, laminar, atmospheric pressure, premixed stagnation flames are investigated for the surrogate fuels n-decane, methylcyclohexane and toluene, which are representative of the alkane, cycloalkane and aromatic components of conventional aviation fuel, respectively. Numerical simulations are directly compared to velocity profile measurements to assess the predictive capabilities of the recently proposed JetSurF 2.0 chemical kinetic mechanism. Simulations of each experiment are carried out using the CHEMKIN-PRO software package together with the detailed mechanism, with accurate specification of the necessary boundary conditions from experimental measurements. Furthermore, a skeletal version of the detailed mechanism is deduced for improved computational speed using a species sensitivity reduction method, here referred to as Alternate Species Elimination (ASE). Toluene experimental data are further compared to a detailed toluene mechanism, termed the Stanford mechanism. The experimental and numerical reference flame speeds are used to infer the true laminar flame speed of the compounds following a recently proposed direct comparison technique that is similar to a non-linear extrapolation to zero flame stretch. JetSurF 2.0 and the skeletal ASE mechanisms demonstrate excellent overall agreement with experiment for n-decane and methylcyclohexane flames, for which the original model was optimized, but poor agreement for toluene, which was not an optimization target. Improved agreement for toluene is observed between the Stanford mechanism and experiment. Results confirm that the direct comparison method yields consistent laminar flame speed data irrespective of the reactivity accuracy of the chemical kinetic model employed. The laminar flame speed results from this study are essential for the further development of chemical kinetic mechanisms and contribute to the surrogate modeling of jet fuel combustion.
机译：层流火焰速度是用于验证化学动力学机理的基本燃烧参数。近年来，使用线性和非线性外推技术得出的纯组分的层流火焰速度已部分验证了为喷气燃料替代组分量身定制的机制。但是，不同研究的结果之间仍然存在明显的偏差，这促使进一步的研究。在这项研究中，研究了代用燃料正癸烷，甲基环己烷和甲苯的层流，大气压力，预混滞止火焰，它们分别代表常规航空燃料的烷烃，环烷烃和芳族组分。将数值模拟与速度分布测量值直接进行比较，以评估最近提出的JetSurF 2.0化学动力学机制的预测能力。使用CHEMKIN-PRO软件包以及详细的机制对每个实验进行仿真，并根据实验测量结果准确指定必要的边界条件。此外，使用物种敏感性降低方法（在此称为替代物种消除（ASE））推导了详细机制的骨架版本，以提高计算速度。进一步将甲苯实验数据与详细的甲苯机理（称为斯坦福机理）进行比较。根据最近提出的直接比较技术，该实验和数值参考火焰速度用于推断化合物的真实层流火焰速度，该技术类似于非线性外推至零火焰拉伸。对于正癸烷和甲基环己烷火焰，JetSurF 2.0和骨架ASE机理显示出与实验极好的总体一致性，为此对原始模型进行了优化，但对于甲苯（不是优化目标）的一致性较差。斯坦福机制和实验之间观察到甲苯的改进的一致性。结果证实，无论所用化学动力学模型的反应精度如何，直接比较方法都能产生一致的层流火焰速度数据。这项研究得出的层流火焰速度对于化学动力学机理的进一步发展至关重要，并有助于航空燃料燃烧的替代模型。

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  • 来源
    《Fuel》 |2013年第11期|586-597|共12页
  • 作者

    J.D. Munzar; B. Akih-Kumgeh; B.M. Denman; A. Zia; J.M. Bergthorson;

  • 作者单位

    McGill University, Department of Mechanical Engineering, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada;

    Syracuse University, L.C. Smith College of Engineering & Computer Science, 223 Link Hall, Syracuse, NY 13244, USA;

    McGill University, Department of Mechanical Engineering, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada;

    McGill University, Department of Mechanical Engineering, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada;

    McGill University, Department of Mechanical Engineering, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada;

  • 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

    Jet fuel surrogate; Laminar flame speed; Methylcyclohexane; Toluene; Skeletal mechanism;

    机译：航空燃料替代品;层流火焰速度;甲基环己烷;甲苯;骨骼机制;

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