Nine decades of rocket engine and gas turbine development have shown that
thermoacoustic oscillations are difficult to predict but can usually be eliminated with …

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 …

Thermoacoustic instability, also known as combustion instability, continues to be a problem
in the development of modern gas turbine combustors and rocket engines. Such instability is …

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 …

Because of physical assumptions and numerical approximations, low-order models are
affected by uncertainties in the state and parameters, and by model biases. Model biases …

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

In this work, the classic problem of the aeroacoustic instability occurring in deep cavities
subject to a low-Mach grazing flow is revisited experimentally and theoretically. This …

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 …

We present a framework for performing input-output system identification near a Hopf
bifurcation using data from only the fixed-point branch, prior to the Hopf point itself. The …

This paper concerns the influence of the phase of the heat release response on
thermoacoustic systems. We focus on one pair of degenerate azimuthal acoustic modes …