Understanding the role of flow dynamics in thermoacoustic combustion instability

J O'Connor - Proceedings of the Combustion Institute, 2023 - Elsevier
Thermoacoustic combustion instability is one of the most challenging operational issues in
several high-performance, low-emissions combustion technologies, including gas turbines …

Influence of hydrogen content and injection scheme on the describing function of swirled flames

T Schuller, S Marragou, G Oztarlik, T Poinsot… - Combustion and …, 2022 - Elsevier
The dynamics of V-shape swirled lean premixed methane/air flames enriched with hydrogen
is examined for two injection schemes. The response of the flames submitted to harmonic …

Combustion instability characteristics via fuel nozzle modification in a hydrogen and natural gas Co-firing gas turbine combustor

J Jung, M Kim, J Hwang, D Kang, W Lee, H Kim… - International Journal of …, 2024 - Elsevier
In this study, three premixed swirl gas turbine nozzles with different fuel injection hole sizes
were designed to optimize combustion characteristics influenced by changes in the …

A combined oscillation cycle involving self-excited thermo-acoustic and hydrodynamic instability mechanisms

D Fredrich, WP Jones, AJ Marquis - Physics of Fluids, 2021 - pubs.aip.org
The paper examines the combined effects of several interacting thermo-acoustic and
hydrodynamic instability mechanisms that are known to influence self-excited combustion …

From snapshots to manifolds–a tale of shear flows

E Farzamnik, A Ianiro, S Discetti, N Deng… - Journal of Fluid …, 2023 - cambridge.org
We propose a novel nonlinear manifold learning from snapshot data and demonstrate its
superiority over proper orthogonal decomposition (POD) for shedding-dominated shear …

Modelling the response of a turbulent jet flame to acoustic forcing in a linearized framework using an active flame approach

TL Kaiser, G Varillon, W Polifke, F Zhang, T Zirwes… - Combustion and …, 2023 - Elsevier
This study performs a linear mean field analysis of a turbulent reacting methane-air jet flame,
with the goal of predicting the response of the reacting flow to upstream acoustic actuation …

Experimental investigation of the helical mode in a stratified swirling flame

S Wang, J Zheng, L Xu, Q An, X Han, C Zhang, L Li… - Combustion and …, 2022 - Elsevier
In a centrally-staged combustor, the stratified swirling flame often manifests a helical mode,
which is characterized by the emergence of helical vortices, including the precessing vortex …

Impact of precessing vortex core dynamics on the thermoacoustic instabilities in a swirl-stabilized combustor

A Karmarkar, S Gupta, I Boxx… - Journal of Fluid …, 2022 - cambridge.org
Global instabilities in swirling flows can significantly alter the flame and flow dynamics of
swirl-stabilized flames, such as those in modern gas turbine engines. In this study, we …

Linear analysis of a swirling jet with a realistic swirler model

G Varillon, TL Kaiser, P Brokof… - … Journal of Spray …, 2024 - journals.sagepub.com
The dynamics of an axisymmetrical swirling jet is studied via global linear stability and
resolvent analyses. The modeled flow represents a combustor-like swirling jet, that is …

Extended cluster-based network modeling for coherent structures in turbulent flows

A Colanera, JM Reumschüssel, JP Beuth… - … and Computational Fluid …, 2025 - Springer
This study introduces the Extended Cluster-based Network Modeling (eCNM), a
methodology to analyze complex fluid flows. The eCNM focuses on characterizing dynamics …