Thermoacoustic instability is a flow instability that arises due to a two-way coupling between
acoustic waves and unsteady heat release rate. It can cause damaging, large-amplitude …

Combustion instability frequently occurs in propulsion and power generation systems. It is
characterized by large-amplitude acoustic oscillations leading to undesirable …

In this study, we theoretically investigate the impact of outlet boundary conditions and mean
temperature gradients on the maximum transient growth rate of acoustical energy and the …

In the analysis of combustion instabilities, especially for the longitudinal modes, the flame
typically is regarded as a discontinuity at rest and the flame motion is usually ignored …

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 …

A semi-analytical solution is developed for the propagation of plane acoustic waves in a
varying area duct, sustaining a 1-D mean flow with a temperature gradient. The mean flow …

Acoustic and entropy waves interacting in a duct with a steady heat source and mean flow
are analysed using an asymptotic expansion (AE) for low frequencies. The analytical AE …

Annular ducts with axial cross-sectional surface area gradient are typical elements in aero-
engines and land-use gas turbines. Acoustic, entropy and vorticity waves propagating in …

In the analysis of combustion instabilities in the annular combustors, especially for the
azimuthal combustion modes, the flame motion is usually neglected and the flame is …

In this work, an asymptotically based framework using a naturally occurring perturbation
parameter is further developed in the context of a one-dimensional tube with an open–open …