FURTHER-STUDIES BY CARS OF PREMIXED TURBULENT COMBUSTION IN A HIGH-VELOCITY FLOW

We have studied a high velocity turbulent flow of air and methane ignited and stabilized by a parallel flow of hot gases. Also studied were the mixing of the two flows without combustion and a configuration where the combustion was stabilized by a recirculation zone in a downward facing step. Through some characteristic data (turbulence intensity, and profiles of velocity and CH//4 and CO concentrations), the structure of the flame and its scales and the increase of turbulence within the flame zone are discussed and compared to other works in turbulent combustion. Instantaneous measurements of fluctuating temperatures are also presented. These measurements have been performed using broadband CARS on N//2.