CFD analysis and application of dynamic mode decomposition for resonant-mode identification and damping in an SGT-100 DLE combustion system

Paper in proceeding, 2015

This paper presents result of a turbulent reacting flow simulation based on a hybrid Unsteady Reynolds Averaged Navier Stokes/Large Eddy Simulation model (Menter’s SAS-SST model) applied to an experimental version of an industrial gas turbine combustion chamber at a pressure of 6 bar. The kinetics were represented by a recently developed in-house 4-step reaction mechanism using 7 species. A reasonably good agreement with measurements is found concerning velocity, temperature, pressure loss, mixture fraction and fuel mass fraction. The dynamic mode decomposition algorithm is also used here in order to identify some resonant modes and to quantify their respective frequency and damping. A number of low frequency modes with combustion dynamics included are observed and compared with the measurements.