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 …

Absolute instabilities and dynamics of helical vortices in twin annular swirling jets

J Zhang, X Hui, Q An, X Han, C Wang - Physics of Fluids, 2023 - pubs.aip.org
Modern low-emissions gas turbine combustors commonly employ a twin annular swirling
flow configuration that consists of a central annular inner jet and a surrounding annular outer …

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 …

Global linear stability analysis of a flame anchored to a cylinder

C Wang, L Lesshafft, K Oberleithner - Journal of Fluid Mechanics, 2022 - cambridge.org
This study investigates the linear stability of a laminar premixed flame, anchored on a
square cylinder and confined inside a channel. Many modern linear analysis concepts have …

FELiCS: a versatile linearized solver addressing dynamics in multi-physics flows

TL Kaiser, S Demange, JS Müller, S Knechtel… - AIAA Aviation 2023 …, 2023 - arc.aiaa.org
View Video Presentation: https://doi. org/10.2514/6.2023-3434. vid This manuscript provides
a brief description of the linearized flow solver FELiCS and reviews six applications of the …

AP/HTPB combustion response simulation with a new equivalent linear system method

X Lv, M Zhang, W Ao, Z Lin, P Liu, Y Cao - Combustion and Flame, 2023 - Elsevier
In the study of solid rocket motor (SRM) combustion instability, modeling and analyzing the
combustion response of the solid propellant is a laborious task. We propose a new idea, an …

Prediction of flame transfer function and combustion instability on a partially premixed swirling combustor by the system identification and CFD methods

E Ke, C Ji, M Wang, D Pan, T Zhu - Aerospace Science and Technology, 2024 - Elsevier
Combustion instability can lead to high amplitude oscillations of pressure in the combustion
chamber, which would seriously affect the normal operation of the combustion system. In …

Numerical analysis of laminar velocity-forced premixed slit flames using modal decomposition techniques

M Rodríguez-Pastor, P Koumides… - Combustion and …, 2024 - Elsevier
Abstract The relation between Proper Orthogonal Decomposition (POD), Dynamic Mode
Decomposition (DMD) and Flame Transfer Functions (FTF) is explored to gain further insight …

[HTML][HTML] The role of hydrodynamic shear in the thermoacoustic response of slit flames

P Brokof, CM Douglas, W Polifke - Proceedings of the Combustion Institute, 2024 - Elsevier
Short wavelength hydrodynamic perturbations excited by long wavelength acoustics can
wrinkle the front of acoustically compact flames, perturb the heat release rate, and generate …

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 …