Turbulent Structure of a Jet Diffusion Flame in a Co-Flowing Air Stream with Grid-Turbulence

Hiroyasu Manako, Toshihisa Ueda, Masahiko Mizomoto

研究成果: Article査読


The effects of a flame on a shear generated turbulence and on a grid-turbulence have been investigated experimentally. A laminar fuel jet, H2-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 grid-turbulence is transported towards the center line by another mechanism than the turbulent mixing, which is dominant in the shear generated turbulence.

ジャーナルTransactions of the Japan Society of Mechanical Engineers Series B
出版ステータスPublished - 1986

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学


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