湍流燃烧的基本火焰结构是拉伸的曲面涡管;拉伸流场中的管形火焰模拟了湍流燃烧的细微结构。本文对平面预混火焰、拉伸预混火焰和管形拉伸预混火焰进行了质量、能量和组分的守恒分析。通过对比这几种火焰,揭示了火焰拉伸效果是通过优先扩散改变火焰温度和熄火极限;而火焰曲率通过增强或削弱这种优先扩散效果来影响火焰温度,影响的大小和火焰厚度与火焰半径的比值呈正比。
The essential structure of turbulent combustion is stretched vortex tube,and this fine flame structure can be resembled by the tubular flame.A physical analysis of the mass,species and energy conservation is carried out on the classic plane prernixed flame,the opposed jet flame and the tubular flame.The comparison between the plane flame and the opposed jet flame reveals that the flame stretch effect results from preferential diffusion and changes prernixed flame temperature and extinction condition.The comparison between the opposed jet flame and the tubular flame shows that flame curvature changes prernixed flame temperature by strengthening or weakening the preferential diffusion,and the strengthening or weakening effect is proportional to the ratio of flame thickness to flame radius.
参考文献
| [1] | A.N. Lipatnikov;J. Chomiak .Molecular transport effects on turbulent flame propagation and structure[J].Progress in energy and combustion science,2005(1):1-73. |
| [2] | C.K. Law;C.J. Sung .Structure, aerodynamics, and geometry of premixed flamelets[J].Progress in energy and combustion science,2000(4/6):459-505. |
| [3] | 李琼,王培勇,邢菲,邹建锋.火焰曲率对H2扩散火焰NO排放影响的数值研究[J].工程热物理学报,2011(11):1949-1952. |
| [4] | Peiyong Wang;Joseph A. Wehrmeyer;Robert W. Pitz .Stretch rate of tubular premixed flames[J].Combustion and Flame,2006(1/2):401-414. |
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