It is accepted that the thermoacoustic behavior of a given combustion system can be
analyzed by investigating how its natural acoustic modes are perturbed by the flame …

This article deals with the symmetry breaking of azimuthal thermoacoustic modes in annular
combustors. Using a nominally symmetric annular combustor, we present experimental …

We take a complex systems approach to investigating experimentally the collective
dynamics of a network of four self-excited thermoacoustic oscillators coupled in a ring. Using …

Thermoacoustic instabilities in stationary gas turbines may cause high-amplitude limit
cycles, leading to damaged components and costly down-time. To better understand the …

In this paper we investigate the effects that breaking the symmetry in an annular
configuration has on the features of standing, spinning and slanted limit cycle oscillations of …

The intrinsic thermoacoustic (ITA) feedbackloop constitutes a coupling between flow, flame
and acoustics that does not involve the natural acoustic modes of the system. One recent …

A recent study (Yong, Silva, and Polifke, Combust. Flame 228 (2021)) proposed the use of
phasor diagrams to categorize marginally stable modes in an ideal resonator with a …

Thermoacoustic systems can exhibit self-excited instabilities of two nature, namely cavity
modes or intrinsic thermoacoustic (ITA) modes. In heavy-duty land-based gas turbines with …

Thermoacoustic instability in the combustion chamber of gas turbines, aero and rocket
engines has become a topic concern. In this paper, a new instability phenomenon in the …

In this study, we connect concepts that have been recently developed in thermoacoustics,
specifically (i) high-order spectral perturbation theory,(ii) symmetry-induced degenerate …