微重力环境下V型层流预混火焰锋面不稳定性分析

本章试图寻求描述火焰锋面动态特性的方法，以解释微重力环境下出现的V型火焰锋面的涟漪现象。采用线性稳定性理论从经典的G方程中导出了描述火焰锋面动态结构的一阶偏微分方程。采用该方程计算了声波扰动后，不同时刻的V型火焰锋面的动态结构．对于谐波扰动，其频率与波数的关系是分析固有火焰锋面不稳定性的基础。因此，微重力环境下V型火焰锋面的不稳定性可能是声波与谐波相耦合的结果。

ANALYTICAL STUDIES ON V-SHAPED LAMINAR PREMIXED FLAME FRONT INSTABILITY AT MICROGRAVITY

The present studies were motivated by the problem of flame front instability appeared in microgravity environment. Without the influence of buoyancy driven pulsation, the laminar V-shaped microgravity flame is characterized by small ripples. Theoretical explanations for this phenomena have been postulated in this paper. By using the linear stability analysis,we transform the classical G equation into a integral equation that describes the flame shape evolution in two-dimensional space. The application of the shape integral equation to acoustic interaction is presented. The calculated results at different time show the dynamic structure of V flame front. Then, we describe several different dispersion relation for the harmonic instability which is the fundament for further analyzing the intrinsic flame instability. The conclusion points out that the ripples appeared in the laminar microgravity V flame are due to the effect of acoustic interaction coupling with the harmonic instability.