火炎面安定特性の数値解析

概要

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Unsteady motions of two-dimensional reactive flows have been simulated to investigate the hydrodynamic flame stability using the one-step irreversible chemical reaction model. The numerical model contains compressibility, viscosity, heat conduction, molecular diffusion, and convection. We have calculated the evolution of disturbed flame fronts and numerically reproduced the disturbance growing exponentially in time as predicted by the linear theory. The growth rate of the disturbance depending on the wave number was obtained and the critical wave number for neutral stability was determined. The calculated unstable region for the case of the Lewis number unity is slightly narrow compared with that of the linear theory because we consider the finite reaction thickness with the preheat zone in the simulation. The departure of the Lewis number from unity has great influence on the flame instability : the unstable region increases when the Lewis number is smaller than unity, and decreases when the Lewis number is larger than unity.
一般社団法人日本機械学会の論文
1990-07-25