B132 Arrangement of Flame Structure by Reaction Progress Variable and Its Gradient in Unsteady Counter-flow Premixed Flame When Changing Equivalence Ratio

Abstract

Numerical simulation is applied to analyze the unsteady counterflow premixed flame. The influence of equivalence ratio is investigated. Fuel lean and stoichiometric mixtures (equivalence ratios are 0.75, 0.85 and 1.0) are considered in this study. Methane-air premixed gas and air are spouted from each plane. The spout velocity is varied in a sine function. As a result, it is shown that the characteristics of flame structure are correlated with the progress variable and its gradient at flame front. It is defined by mass fraction of oxidizer and corrected by mass fraction rate of fuel.