Vガッタに保持された予混合火炎に対する流れ場の変動の影響

概要

論文の詳細を見る
In a premixed flame stabilized by a V-gutter holder, direct numerical calculation was performed aiming at the examination of the interaction of fluctuating vortices and the combustion reaction caused downstream of the V-gutter and the elucidation of the effect of flow fluctuation on the behavior and the stability of the premixed flame. Important dimensionless parameters which affect the phenomenon are the Reynolds number and Damkohler number, and the effect of these parameters on the behavior and the stability of the premixed flame was systematically clarified. The flame configuration is classified according to the Damkohler number. The flame is blown off when the Damkohler number is very small and the Karman vortex street is formed. A flame which adheres to the V-gutter is formed when the Damkohler number is fairly large, and changes into a long one which expands to the calculation area downstream from a short one as the Damkohler number increases. This long flame might be parallel or oblique to the direction of the uniform flow of a premixed mixture. The effect of stabilization due to the density gradient in the velocity shear layer downstream of the V-gutter on the Kelvin-Helmholtz instability is important, and flow is stabilized when the flame is parallel to a premixed mixture flow.
社団法人日本機械学会の論文
1997-06-25