The thermoacoustic effect is a complicated occurrence that involves the mutual conversion
of sound and thermal energy. Thermoacoustic heat engines built on this effect have …

Practical passive control solutions for azimuthal thermoacoustic instabilities in annular
combustors, which typically involve symmetry-breaking strategies, have garnered increasing …

Passive damping devices such as Helmholtz dampers are often employed in gas turbines to
mitigate thermoacoustic instabilities. The periodic ingestion of the combustion chamber hot …

For annular combustors, the interactions between different modal structures (longitudinal,
azimuthal spinning, standing, and slanted) remain a challenge in ongoing studies of …

We consider the acoustic flow field of rotationally symmetric systems, like an annular
combustor and the flow in a round duct, in absence of a mean azimuthal flow field. We focus …

The thermoacoustic instability characteristics in a variable-length annular combustor fueled
by ammonia-methane were investigated in the present work, focusing on the effects of …

Recent experimental studies suggest that lean-premixed pure hydrogen combustion plays a
central role in generating self-sustained pressure oscillations, preferentially coupled with …

Hydrogen is a promising zero-carbon fuel for decarbonized energy and transportation
sectors. While carbon emission is not a concern for hydrogen combustion, its higher …

Dual-volume Helmholtz dampers with two resonant frequencies are proposed to
simultaneously attenuate longitudinal and azimuthal thermo-acoustic instabilities in annular …

High frequency thermoacoustic instabilities are problematic for lean-premixed gas turbines.
Identifying which acoustic mode is being excited is important, in that it provides insight into …