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首页> 外文期刊>Combustion and Flame >Comparative study between Conditional Moment Closure (CMC) and Conditional Source-term Estimation (CSE) applied to piloted jet flames
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Comparative study between Conditional Moment Closure (CMC) and Conditional Source-term Estimation (CSE) applied to piloted jet flames

机译：条件矩闭合（CMC）和条件源项估计（CSE）用于引燃喷射火焰的比较研究

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摘要

Conditional Moment Closure (CMC) and Conditional Source-term Estimation (CSE) are investigated in a direct side-by-side comparison of the Sandia flames. The objective of the present study is to determine the strengths and weaknesses of each modelling approach given the same initial conditions and computational set-up. The predictions from both CMC and CSE are compared to detailed experimental data. In case of Sandia flame D, the CMC and CSE turbulent flow and mixing fields are similar near the nozzle exit, in agreement with the experimental data, with some differences farther downstream. The CMC and CSE conditional mass fractions for the major species are in good agreement with the experimental data downstream of the nozzle for lean mixtures. For fuel rich mixtures, an underprediction of the conditional mass fractions of methane and corresponding overestimation of the conditional mass fraction of water are observed at some axial locations. The CMC and CSE conditional mass fractions of the minor species and conditional temperature reproduce the general characteristics of the experimental profiles. However, major differences are observed for Sandia flame E. The discrepancies are attributed to the use of RANS and the boundary conditions set in CMC and some approximations made in the chemistry tables in CSE. Favre-averaged profiles are comparable in CMC and CSE. The computational time for each model is investigated and CSE appears to be faster. Further discussion on some of the strengths and weaknesses of each combustion model is also presented. Overall, both CMC and CSE are shown to produce results of comparable quality given the same numerical schemes, mesh, and boundary conditions. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All tights reserved.
机译：在桑迪亚火焰的直接并排比较中研究了条件矩闭合（CMC）和条件源项估计（CSE）。本研究的目的是确定在给定相同的初始条件和计算设置的情况下每种建模方法的优缺点。将CMC和CSE的预测与详细的实验数据进行比较。在桑迪亚火焰D的情况下，喷嘴出口附近的CMC和CSE湍流和混合场相似，与实验数据一致，但在下游更远。主要物质的CMC和CSE条件质量分数与稀薄混合物喷嘴下游的实验数据非常吻合。对于富含燃料的混合物，在某些轴向位置观察到甲烷的条件质量分数的低估和水的条件质量分数的相应高估。少数物种的CMC和CSE条件质量分数和条件温度再现了实验曲线的一般特征。但是，观察到桑迪亚火焰E的主要差异。差异是由于使用RANS和CMC中设置的边界条件以及CSE中化学表中的某些近似值造成的。 Favre平均配置文件在CMC和CSE中具有可比性。研究了每种模型的计算时间，CSE似乎更快。还介绍了每种燃烧模型的一些优点和缺点的进一步讨论。总体而言，在相同的数值方案，网格和边界条件下，显示CMC和CSE都能产生可比较质量的结果。 （C）2017燃烧研究所。由Elsevier Inc.发布。保留所有紧身衣。

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  • 来源
    《Combustion and Flame》 |2017年第7期|172-187|共16页
  • 作者

    Labahn Jeffrey W.; Stankovic Ivana; Devaud Cecile B.; Merci Bart;

  • 作者单位

    Univ Waterloo, Dept Mech & Mechatron Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada;

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

    Univ Waterloo, Dept Mech & Mechatron Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada;

    Univ Ghent, Dept Flow Heat & Combust Mech, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium;

  • 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

    CMC; CSE; SANDIA D flame; SANDIA E flame; Turbulent; Combustion;

    机译：CMC;CSE;SANDIA D火焰;SANDIA E火焰;湍流;燃烧;

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