上海交通大学学报

上海交通大学学报 >

2022 , Vol. 56 >Issue 1: 35 - 44

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2019.298

带有局部熄火现象的部分预混火焰大涡模拟研究

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  • a.江苏大学 能源与动力工程学院,江苏 镇江 212013
    b.江苏大学 能源研究院,江苏 镇江 212013
曾海翔(1994-),男,河南省信阳市人,硕士生,主要研究方向为湍流燃烧、大涡模拟.

收稿日期: 2020-10-22

  网络出版日期: 2022-01-21

基金资助

国家自然科学基金面上项目(91741117);国家自然科学基金面上项目(51576092)

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Large Eddy Simulation of Partially Premixed Flame with Local Extinction Phenomenon

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  • a. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
    b. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, Jiangsu, China

Received date: 2020-10-22

  Online published: 2022-01-21

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摘要

对带有局部熄火现象的悉尼部分预混火焰FJ200-5GP-Lr75-103算例进行大涡模拟研究,计算中采用动态k方程亚格子模型和动态增厚火焰(DTF)燃烧模型.考虑当量比变化对层流火焰厚度和速度的影响,在DTF模型中引入两个拟合函数,可根据流场中混合分数的变化自适应调整火焰褶皱函数中的层流火焰参数.研究结果表明,动态k方程模型很好地预测了非均匀预混气的混合分数变化;对于熄火现象比较严重的中下游区域,大涡模拟计算得到的温度、组分的统计信息及温度散点图分布规律与实验数据吻合良好;改进后的DTF模型较好地捕捉到了悉尼非均匀入流部分预混火焰的局部熄火现象, 但对于流场下游CO质量分数的预测,计算值比实验结果存在一些偏离.

关键词： 局部熄火; 部分预混火焰; 增厚火焰模型; 大涡模拟

本文引用格式

曾海翔, 王平, SHROTRIYA Prashant, 姜霖松, MURUGESAN Meenatchidevi . 带有局部熄火现象的部分预混火焰大涡模拟研究[J]. 上海交通大学学报, 2022 , 56(1) : 35 -44 . DOI: 10.16183/j.cnki.jsjtu.2019.298

Abstract

The Sydney partially premixed flame FJ200-5GP-Lr75-103 case with the local extinction phenomenon is studied by large eddy simulation (LES) coupled with the dynamic k equation sub-grid scale model and the dynamic thickened flame (DTF) combustion model. To account for the influence of non-uniform equivalence ratio on the laminar flame speed and thickness, two fitting functions are introduced in the DTF model to automatically adjust these two parameters in the wrinkling functions, according to the local value of mixture fraction in the flow field. The results show that the dynamic k equation model can predict the mixture fraction of the non-uniform premixed gas in the flow field well. In the middle and downstream with more flame extinction, the temperature, the species profiles, and the scatter plot of temperature versus mixture fraction calculated by LES agree well with the experiment data. This demonstrates that the improved DTF model can capture the local extinction phenomenon in partially premixed flame, but for the CO mass fraction, discrepancy between the LES results and experiment data is presented.

Key words： local extinction; partially premixed flame; thickened flame model; large eddy simulation (LES)

参考文献

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