Recurrence Analysis of Combustion Noise

Recurrence analysis of phase space trajectories reconstructed from scalar time series-a relatively new technique in the field of combustion dynamics-is proposed for analyzing combustion noise data. A demonstration based on the implementation of this analysis on combustion noise data acquired in experiments on an open bluff-body stabilized turbulent premixed flame is presented in this article. A combined analysis methodology involving conventional techniques: spectral analysis and proper orthogonal decomposition, together with recurrence analysis is found to be effective in identifying features embedded in combustion noise signals. In particular, the new perspective provides insights into the temporal transitions of pressure fluctuations between noise and periodic dynamics. The recurrence analysis technique, which is found to be instrumental in extracting the dynamical makeup of combustion noise signals in this work, is foreseen to be greatly beneficial for the analysis of experimental and numerical results on turbulent flows and turbulent combustion - processes that often involve an interplay between noise and deterministic dynamics.