円柱に保持された予混合火炎の離散うず法によるシミュレーション

概要

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The role of volumetric expansion on the formation of vortical structures of premixed flames stabilized by a circular cylinder was numerically studied using the Discrete Vortex Method. The flame's predicted behavior was qualitatively identical with our experimental observations. Volumetric expansion resulted in a flash-back phenomenon when the flow velocity was small, and interupted the interaction between the shear layers on both sides of the circular cylinder when the flow velocity was moderate. When the flow velocity became larger and the effect of volumetric expansion became relatively smaller, a reciprocal vortical flame structure similar to Karman vortex street appeared. However, the Strouhal number derived from the simulated flame patterns was twice that of the Karman vortex street, and increased with the flow velocity.
1986-05-25