Analysis of a Lean Premixed Stratified Burner Using Rayleigh Scattering (CAT#: STEM-ST-0006-YJL)

Introduction

Several experimental and numerical studies have already been devoted to stratified flames in the past, which partly revealed deviations from homogeneous systems. Various approaches, ranging from the detailed analysis of one-dimensional flame propagation through an equivalence ratio gradient to three-dimensional turbulent systems, have been used to investigate the impact of an inhomogeneous mixture distribution often found in practical combustors.<br />Regarding the one-dimensional investigations, basically two physical quantities were identified to characterize the stratification. The first one is the length scale on which equivalence ratio variations take place. The second quantity is the alignment of the mixing layer and the reaction layer.