セル状火炎の構造に及ぼす流体力学的不安定の影響

概要

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The influence of hydrodynamic instability on the structure of cellular flames is investigated using numerical method. The equation used is the compressible Navier-Stokes equation including an one-step chemical reaction. We superimpose sufficiently small disturbances on the plane flame and calculate the evolution of flame fronts to obtain the relation between the growth rate and the wave number, i. e., the dispersion relation. As the flame temperature increases, the growth rate becomes larger. The unstable range hardly changes, and the peculiar wave number is almost constant. Thus, the spacing between cells in the cellular flame is independent of the flame temperature. Moreover, we superimpose a considerably large disturbance with the peculiar wavelength to study the structure of cellular flames. The higher the flame temperature, the deeper the cell and the broader the flame surface. In addition, the cell depth and the surface area of the three-dimensional flame are larger than those of the two-dimensional flame.
一般社団法人日本機械学会の論文
1998-10-25