Abstract
In this study, we have investigated the local flame structure using OH-PLIF system. We have used a cyclone-jet combustor to establish turbulent premixed flames for propane/air mixtures, covering the flamelet regime and thin reaction zone regime on the combustion diagram. By comparing the experimental results with calculations using GRI-Mech 3.0, the OH concentration is quantitatively determined. When the velocity is increased, flame motion is larger to have large fluctuation in OH profile. The peak OH concentration in flame zone is smaller. This fact can be interpreted as the decrease of the local burning velocity due to the incomplete reaction by large strain rate.
