Numerical analysis of laminar velocity-forced premixed slit flames using modal decomposition techniques

As a result of work carried out within HYINHEAT, we are pleased to share the peer-reviewed publication “Numerical analysis of laminar velocity-forced premixed slit flames using modal decomposition techniques”, published in the journal Combustion and Flame.

Abstract

The relation between Proper Orthogonal Decomposition (POD), Dynamic Mode Decomposition (DMD) and Flame Transfer Functions (FTF) is explored to gain further insight into the dynamics of two-dimensional laminar slit flames externally forced by velocity perturbations.
The study uses modal decomposition techniques to analyse heat release rate fields and identify the physical mechanisms governing flame dynamics. The POD analysis distinguishes between modes associated with the displacement of the reactive sheet and those related to local flame-front distortions, identifying preferential frequencies connected with the phase and gain of the Flame Transfer Functions. The results also indicate that flame-tip dynamics can be interpreted as a combination of standing waves whose response contributes to fluctuations in the spatially integrated heat release.
In addition, the DMD analysis highlights the interaction between the flame and the flow and the fundamental role of velocity perturbations at the flame base. Overall, the study demonstrates how data-driven decomposition methods can help identify complex physical phenomena contained in Flame Transfer Functions and connect their modal behaviour with the underlying physical processes.

Authors

Marc Rodriguez-Pastor, Phivos Koumides, Eduardo J. Pérez, Jorge García Tíscar, Jaime Alberto Broatch Jacobi, and Daniel Mira 

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