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 …

Exceptional points are found in the spectrum of a prototypical thermoacoustic system as the
parameters of the flame transfer function are varied. At these points, two eigenvalues and …

This study analyses the interplay between classical acoustic modes and intrinsic
thermoacoustic (ITA) modes in a simple thermoacoustic system. The analysis is performed …

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 …

Thermoacoustic instabilities originate from the interaction of unsteady heat release rate
associated with flames and the acoustic modes of a combustor. A feedback loop not …

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 …

We identify an exceptional point in the numerical stability map of a combustion experiment
operated with laminar premixed flames. A low-order model of the experiment allows one to …