Abstract
In this study, experimental and numerical studies were perfomed to investigate the turbulent flow field in a gas turbine combustor. In the experiment, velocity components in each direction were measured using hot-wire anemometer. In the numerical simulation, the flow fields in the combustor with and without casing were numerically analyzed using Large Eddy Simulation (LES) as a turbulence model. The existance of recirculation zone was observed in both experimental and numerical results. It was obtained from simulation that the inlet conditions for secondary and dilution air were also different in both cases, and it seems to be caused by the swirling flow in the combustor. It means the secondary and dilution air flow have momentum not only in radial direction but also in axial and tangential directions. By including casing spaces in computational domain, the momentum of secondary and dilution air was able to be predicted, and more accurate predicted results of flow field in gas turbine combustor were obtained.
