DNS Analysis on the Indirect Relationship between the Local Burning Velocity and the Flame Displacement Speed of Turbulent Premixed Flames

• 作者: Eiji Tomita Kazuya Tsuboi
• 来源期刊: 流体动力学(英文)
• 学科: 医学
• 关键词: LOCAL Burning Velocity FLAME DISPLACEMENT Speed FLAME STRETCH RATE Tangential Strain RATE FLAME Curvature Turbulent PREMIXED FLAME Direct Numerical Simulation
• 年，卷（期）: 2014,（3）
• 页码范围: 288-297
• 页数: 10页
• 分类号: R73

摘要

The local burning velocity and the flame displacement speed are the dominant properties in the mechanism of turbulent premixed combustion. The flame displacement speed and the local burning velocity have been investigated separately, because the flame displacement speed can be used for the discussion of flame-turbulence interactions and the local burning velocity can be used for the discussion of the inner structure of turbulent premixed flames. In this study, to establish the basis for the discussion on the effects of turbulence on the inner structure of turbulent premixed flames, the indirect relationship between the flame displacement speed and the local burning velocity was investigated by the flame stretch, the flame curvature, and the tangential strain rate using DNS database with different density ratios. It was found that for the local tangential strain rate and the local flame curvature, the local burning velocity and the flame displacement speed had the opposite correlations in each density ratio case. Therefore, it is considered that the local burning velocity and the flame displacement speed have a negative correlation.