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首页> 外文期刊>Combustion and Flame >Large eddy simulation of dilute reacting sprays: Droplet evaporation and scalar mixing
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Large eddy simulation of dilute reacting sprays: Droplet evaporation and scalar mixing

机译：稀反应喷雾的大涡模拟：液滴蒸发和标量混合

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摘要

Large eddy simulation (LES) of turbulent reacting sprays is performed to investigate the interactions of droplet evaporation and subfilter scalar mixing processes. A stochastic method is proposed to generate the subfilter fluctuations in gas-phase reactive scalars in the framework of a mixture-fraction-based combustion model. The subfilter fluctuations of the gas-phase temperature and composition, seen by droplets, are used to refine the estimates of the interphase heat/mass transfer rates. Gas-phase combustion is described by the flamelet progress variable approach. The effects of droplet evaporation on subfilter scalar mixing are considered by solving the transport equation for the subfilter mixture fraction variance. The mixture fraction that is valid instantaneously in both the gas and the liquid phases is adopted and its implication on the modeling of the evaporation source term in the subfilter variance equation is discussed. The modeling approach has been applied to the Sydney dilute reacting sprays. To account for uncertainty in the modeling of scalar dissipation rates in spray flames, a parametric study is performed for the constant in the scalar dissipation model for the subfilter variance equation. The effects of subfilter fluctuations on droplet evaporation are found to depend on the inflow condition of the pre-evaporated gas-phase mixture and the liquid injection rate in the present dilute reacting sprays.
机译：进行了湍流反应喷雾的大涡模拟（LES），以研究液滴蒸发和子过滤器标量混合过程的相互作用。在基于混合分数的燃烧模型的框架下，提出了一种随机方法来生成气相反应标量中的子滤波器波动。液滴看到的气相温度和成分的子过滤器波动可用于细化相间传热/传质速率的估算值。气相燃烧通过小火焰进展变量方法来描述。通过求解子过滤器混合分数变化的输运方程，可以考虑液滴蒸发对子过滤器标量混合的影响。采用在气相和液相中均有效的混合分数，并讨论了其对子过滤器方差方程中蒸发源项建模的影响。该建模方法已应用于悉尼稀反应喷雾。为了解决喷雾火焰中标量耗散率建模的不确定性，对子滤波器方差方程的标量耗散模型中的常数进行了参数研究。发现副过滤器波动对液滴蒸发的影响取决于预蒸发的气相混合物的流入条件和当前的稀反应喷雾中的液体注入速率。

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  • 来源
    《Combustion and Flame》 |2013年第10期|2048-2066|共19页
  • 作者

    Santanu De; Seung Hyun Kim;

  • 作者单位

    Department of Mechanical Engineering - Engineering Mechanics, Michigan Technological University, Houghton, MI 49931-1295, USA;

    Department of Mechanical Engineering - Engineering Mechanics, Michigan Technological University, Houghton, MI 49931-1295, USA;

  • 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

    Sprays; LES; Mixture fraction; Flamelet model; Scalar mixing;

    机译：喷雾剂LES;混合分数;火焰模型;标量混合;

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