Abstract
The effect of the diffusive-thermal instability on the burning velocity of cellular flames is numerically studied. The burning velocity of cellular flames is large compared with that of plane flames and increases as the Lewis number becomes lower. When the Lewis number is unity, rise of the burning velocity is equal to that of the area of a flame surface. On the other hand, when the Lewis number is lower than unity, the former is larger than the latter. The local burning velocity increases/decreases at the convex/concave flame surface toward the unburned gas for low Lewis numbers. The increase of the local burning velocity at the convex surpasses the decrease at the concave. Thus, the ratio of the burning velocity to the surface area increases as intensity of the diffusive-thermal instability becomes greater.
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