Adjoint methods as design tools in thermoacoustics
L Magri - Applied Mechanics Reviews, 2019 - asmedigitalcollection.asme.org
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 …
with acoustic pressure oscillations. If the heat release is sufficiently in phase with the …
Perturbation theory of nonlinear, non-self-adjoint eigenvalue problems: simple eigenvalues
The study of the vibrational modes and stability of a given physical system is strongly tied to
the efficient numerical evaluation of its eigenvalues. The operators governing the …
the efficient numerical evaluation of its eigenvalues. The operators governing the …
Thermoacoustic modes of intrinsic and acoustic origin and their interplay with exceptional points
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 …
two sets: one of acoustic origin and one of intrinsic thermoacoustic (ITA) origin. To do this …
Low-order modeling to investigate clusters of intrinsic thermoacoustic modes in annular combustors
GJJ Fournier, M Haeringer… - … of Engineering for …, 2021 - asmedigitalcollection.asme.org
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 …
and acoustics that does not involve the natural acoustic modes of the system. One recent …
Intrinsic thermoacoustic modes in an annular combustion chamber
PE Buschmann, GA Mensah, JP Moeck - Combustion and Flame, 2020 - Elsevier
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 …
associated with flames and the acoustic modes of a combustor. A feedback loop not …
A state-space formulation of a discontinuous Galerkin method for thermoacoustic stability analysis
M Meindl, A Albayrak, W Polifke - Journal of Sound and Vibration, 2020 - Elsevier
A hybrid approach for thermoacoustic stability analysis is formulated in a state-space
framework. The approach distinguishes between regions of the computational domain with …
framework. The approach distinguishes between regions of the computational domain with …
Thermoacoustic spectrum of a swirled premixed combustor with partially reflecting boundaries
KJ Yong, M Meindl, W Polifke… - … of Engineering for …, 2020 - asmedigitalcollection.asme.org
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 …
on thermoacoustic stability. Parametric maps of the thermoacoustic spectrum are utilized for …
Adjoint-based calculation of parametric thermoacoustic maps of an industrial combustion chamber
The aim of this study is to efficiently calculate parametric thermoacoustic maps of typical
combustion chambers. Two configurations are considered: an academic configuration …
combustion chambers. Two configurations are considered: an academic configuration …
Low-Order Modeling to Investigate Clusters of ITA Modes in Annular Combustors
GJJ Fournier, M Haeringer… - … Expo: Power for …, 2020 - asmedigitalcollection.asme.org
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 …
and acoustics that does not involve the natural acoustic modes of the system. One recent …