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 …

In a thermoacoustic system, such as a flame in a combustor, heat release oscillations couple
with acoustic pressure oscillations. If the heat release is sufficiently in phase with the …

We propose a general classification of all the modes of a given thermoacoustic system into
two sets: one of acoustic origin and one of intrinsic thermoacoustic (ITA) origin. To do this …

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 study, we apply periodic flow excitation of the precessing vortex core at the
centerbody of a swirl-stabilized combustor to investigate the impact of the precessing vortex …

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 …

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

It may be generally believed that the thermoacoustic eigenfrequencies of a combustor with
fully acoustically reflecting boundary conditions depend on both flame dynamics and …

This study investigates the effect of partial acoustic reflection at inlet or outlet of a combustor
on thermoacoustic stability. Parametric maps of the thermoacoustic spectrum are utilized for …

Identification of thermoacoustic systems usually requires low-order modeling, often obtained
by means of a Galerkin projection onto a single acoustic mode. The resulting dissipative self …