Micro and mesoscale combustion is highly relevant for power generation in small scale applications such as actuators, rovers, unmanned air vehicles, thrusters, and industrial heating devices. In these combustion systems, thermoacoustic instability caused by a resonance between the flame dynamics and the combustor's acoustic modes can lead to increase noise and vibrations resulting in performance losses.

In this project, a fundamental configuration - flame propagating in a duct, will be used to investigate the interactions between the flame and the acoustic modes in small-scale combustion devices. Prior experimental investigations by UPM, Spain showed that this configuration exhibits high-amplitude flame oscillations when operated with natural gas. Direct numerical simulations will be used to replicate these experimental observations. The computations will then be used to investigate hydrogen and ammonia-hydrogen flames and establish differences in the stability behavior to natural gas. Furthermore, the use of porous media as a control strategy to mitigate the instabilities will be investigated through experiments. These experiments will be aimed for the acoustic characteristics of these porous media and their thermoacoustic mitigation potential performance in a bluff-body combustor.