燃烧和反应

Large Eddy Simulation Study on the Turbulence and Flame Characteristics under Analogical Integral Scale and Turbulence Intensity of Turbulent Premixed Flames

  • WEI Xutao ,
  • WANG Jinhua ,
  • ZHANG Meng ,
  • HUANG Zuohua
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  • State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

网络出版日期: 2023-11-28

基金资助

This study is supported by National Science and Technology Major Project (J2019-III-0014-0058), Natural Science Foundation of Science and Technology Department of Shaanxi Province (2022JQ-712) and Scientific Research Program of Shaanxi Provincial Education Department (21JK0642).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Large Eddy Simulation Study on the Turbulence and Flame Characteristics under Analogical Integral Scale and Turbulence Intensity of Turbulent Premixed Flames

  • WEI Xutao ,
  • WANG Jinhua ,
  • ZHANG Meng ,
  • HUANG Zuohua
Expand
  • State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Online published: 2023-11-28

Supported by

This study is supported by National Science and Technology Major Project (J2019-III-0014-0058), Natural Science Foundation of Science and Technology Department of Shaanxi Province (2022JQ-712) and Scientific Research Program of Shaanxi Provincial Education Department (21JK0642).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

本生灯燃烧器是研究湍流-火焰相互作用的典型几何模型燃烧器。在大多数实验研究中,仅使用湍流强度和积分尺度来表征湍流流场,而不考虑湍流孔板的穿孔几何形状。然而,由于穿孔几何形状影响涡的形成和破碎,在讨论火焰-湍流相互作用时必须考虑。为了研究相近湍流强度和积分尺度条件下不同孔板的穿孔几何形状对甲烷/空气火焰的影响,采用动态增厚火焰模型进行大涡模拟。模型验证表明,大涡模拟与实验结果吻合较好。在无反应流动中,圆孔板条件下的涡拉伸项始终大于狭缝孔板条件下的涡拉伸项,这是由于流场中的应力对涡量矢量拉伸造成的。在反应流的火焰根部,旋涡拉伸起主要作用,圆孔板条件下的总涡量仍然较大。在圆孔板条件下,更多的小涡可以影响和皱折火焰前缘,从而增加大曲率下的概率密度分布。两种孔板的穿孔情况下的三维曲率分布均偏向于负值。瞬时火焰前缘的曲率呈负趋势,这是膨胀项影响的结果。圆孔板条件下火焰前缘的涡伸和膨胀值明显较大。

本文引用格式

WEI Xutao , WANG Jinhua , ZHANG Meng , HUANG Zuohua . Large Eddy Simulation Study on the Turbulence and Flame Characteristics under Analogical Integral Scale and Turbulence Intensity of Turbulent Premixed Flames[J]. 热科学学报, 2023 , 32(1) : 488 -501 . DOI: 10.1007/s11630-022-1758-7

Abstract

Bunsen burner is a typical geometry for investigating the turbulence-flame interaction. In most experimental studies, only turbulence intensity u′ and integral scale l0 are used to characterize the turbulent flow field, regardless of the perforation geometry of perforated plates. However, since the geometry influences the developing process and vortex broken, the plate geometry has to be considered when discussing the flame-turbulence interaction. In order to investigate conditions at the same l0 and u′ using different geometries, large eddy simulation of CH4/air flames with dynamic TF combustion model was performed. The model validation shows good agreement between Large Eddy Simulation (LES) and experimental results. In the non-reacting flows, the Vortex Stretching of circular-perforated plate condition is always larger than that of slot-perforated plate condition, which comes from the stresses in the flow fields to stretch the vorticity vector. In reacting flows, at the root of the flame, the Vortex Stretching plays a major role, and the total vorticity here of circular-perforated plate condition is still larger (53.8% and 300% larger than that of the slot-perforated plate at x/D=0 and x/D=2.5, respectively). More small-scale vortex in circular-perforated plate condition can affect and wrinkle the flame front to increase the Probability Density Function (PDF) at large curvatures. The 3D curvature distributions of both cases bias to negative values. The negative trend of curvatures at the instant flame front results from the Dilatation term. Also, the value of the Vortex Stretching and the Dilatation at the flame front of circular-perforated plate condition is obviously larger.

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