格子乱流中に形成される噴流拡散火炎の乱れ構造

概要

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The effects of a flame on a shear generated turbulence and on a grid-turbulence have been investigated experimentally. A laminar fuel jet, H_2-Ar mixture (volumetric ratio 1/2.5), was injected from a burner tube. The jet velocity was 5.0 m/s. The velocity of a co-flowing air stream was 7.0 m/s and the turbulent intensity was 3.9 % and 0.54 % with and without the grid, respectively. Conclusions obtained are as follows : (1) The deceleration of mean velocity along the center line is retarded by the flame. This is mainly attributed to the suppression of turbulent mixing between the jet and the co-flowing air stream caused by the increased viscosity. (2) Though the turbulent intensity of the shear generated turbulence is suppressed significantly at the flame zone, such a significant suppression of the grid-turbulence is not observed. (3) The gid-turbulence is transported toward the center line by another mechanism than the turbulent mixing, which is dominant in the shear generated turbulence.
一般社団法人日本機械学会の論文
1986-01-25