Abstract
This study investigates the effects of oxygen concentration on combustion instabilities in a laboratory-scale premixed gas-turbine model combustor. We adopt two nonlinear analytical methods based on dynamical systems theory: the color version of recurrence plot and local predictor model for OH chemiluminescence intensity fluctuations inside the combustor. The obtained results clearly show that the dynamical behavior of the OH chemiluminescence intensity fluctuations undergoes a significant transition from chaos to periodic oscillations with increasing oxygen concentration.
