811 天井面に形成される層流境界層拡散火炎の数値解析

概要

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Numerical analysis of a diffusion flame established in a laminar boundary layer on ceiling surface with fuel gas injection has been carried out. The flame shape, details of flow field and diffusion of component gas of the diffusion flame are examined in detail. And these characteristics of the diffusion flame on ceiling surface were compared with these of a diffusion flame on floor surface. A separation region formed in front of the leading flame edge on the diffusion flame on ceiling surface becomes large in comparison with that of the diffusion flame on floor surface and the leading flame edge shifts to the upstream. Since the quantity of the oxygen carried to the leading flame edge decreases, the reaction rate becomes small at the leading flame edge. Based on these results, the influence of the gravity direction relative to the flame on the characteristics of the diffusion flame in a laminar boundary layer on ceiling surface are made clear.
2002-08-23