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Effects of turbulent intensity and droplet diameter on spray combustion using direct numerical simulation

机译：直接数值模拟的湍流强度和液滴直径对喷雾燃烧的影响

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摘要

Direct numerical simulation (DNS) of heptane reacting sprays in a slab region is performed to investigate the effects of turbulence and droplet size on the evolutions of spray combustion. The gas phase is simulated using an Eulerian approach; while the droplets are treated with a Lagrangian method. The coupling between the two phases is considered. It is shown that the mean normalized squared droplet diameter decreases linearly for the cases studies, featuring the d~2 law. Turbulence is proved to be of advantage to evaporation while droplet diameter greatly affects the evaporating rate and the evaporation lifetime. The conditional evaporating rate is found to increase linearly with the mixture fraction. The log-normal distribution for the scalar dissipation rate is examined, and reasonably good agreements are obtained between the DNS results and the model predictions. A parameter characterizing the amount of burning in premixed regime, W_p, is analyzed. Two stages of combustion are identified for the base case: most of the burning occurs in a non-premixed fashion following auto-ignition, and then premixed combustion becomes prevalent. It is shown that the fraction of premixed combustion generally increases with turbulent intensity and decreases with droplet diameter.
机译：在平板区域内进行庚烷反应喷雾的直接数值模拟（DNS），以研究湍流和液滴尺寸对喷雾燃烧演变的影响。使用欧拉方法模拟气相。而液滴则用拉格朗日法处理。考虑了两相之间的耦合。结果表明，案例研究的平均归一化平方滴直径呈线性下降，具有d〜2定律。湍流被证明对蒸发是有利的，而液滴直径极大地影响了蒸发速率和蒸发寿命。发现条件蒸发速率随混合物分数线性增加。检查标量耗散率的对数正态分布，并在DNS结果和模型预测之间获得合理的良好一致性。分析表征预混合状态下燃烧量的参数W_p。对于基本情况，确定了燃烧的两个阶段：自动点火后，大多数燃烧以非预混合的方式发生，然后预混合的燃烧变得普遍。结果表明，预混合燃烧的分数通常随湍流强度而增加，而随液滴直径而减小。

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  • 来源
    《Fuel》 |2014年第4期|311-318|共8页
  • 作者

    Haiou Wang; Kun Luo; Jianren Fan;

  • 作者单位

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR 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

    Numerical simulation; Spray combustion; Evaporation; Flamelet structure; Combustion regime;

    机译：数值模拟喷雾燃烧;蒸发;小火焰结构;燃烧方式;

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