Self-coupling: an effective method to mitigate thermoacoustic instability

The presence of undesirable large-amplitude self-sustained oscillations in combustors resulting from thermoacoustic instability can lead to performance loss and structural damage components gas turbine rocket engines. Traditional feedback controls mitigate possess electromechanical components, which are expensive maintain regularly unreliable the harsh environments combustors. In this study, we demonstrate quenching through self-coupling—a method wherein a hollow tube is used provide acoustic self-feedback system. Through experiments modeling, identify optimal coupling conditions for attaining amplitude death, i.e., complete suppression instabilities, horizontal Rijke tube. We examine effect both system parameters on occurrence death. thereby show that parametric regions death occur when length close an odd multiple location place achieving near antinode pressure standing wave Furthermore, find self-coupling mitigates more effectively than mutual two identical tubes. Thus, believe prove be simple, cost-effective solution mitigating