The Role of Acoustic Damping Devices in the Stability of Intrinsic Thermoacoustic Modes
Motivation
Thermoacoustic instability is traditionally mitigated by implementing damping devices tuned to a specific frequency range of interest. However, recent research suggests that while these devices are effective in mitigating or suppressing acoustic modes, they may inadvertently act as promoters of intrinsic thermoacoustic (ITA) modes.
Objectives and Strategy
Current work in our group focuses on simulating this anomalous behavior using a combination of modeling approaches, ranging from reduced-order models based on one-mode Galerkin expansions to high-fidelity numerical simulations, such as Large Eddy Simulation (LES). One of the primary objectives of this project is to uncover the mechanisms behind the stability of ITA modes and to understand why classical damping devices, such as Helmholtz resonators or acoustic liners, may be suboptimal for their control. This understanding is crucial for designing passive control methods that are robust against both acoustic and ITA instabilities