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 …
several high-performance, low-emissions combustion technologies, including gas turbines …
A weakly nonlinear analysis of the precessing vortex core oscillation in a variable swirl turbulent round jet
K Manoharan, M Frederick, S Clees… - Journal of Fluid …, 2020 - cambridge.org
We study the emergence of precessing vortex core (PVC) oscillations in a swirling jet
experiment. We vary the swirl intensity while keeping the net mass flow rate fixed using a …
experiment. We vary the swirl intensity while keeping the net mass flow rate fixed using a …
The role of strain rate, local extinction, and hydrodynamic instability on transition between attached and lifted swirl flames
Q An, AM Steinberg - Combustion and Flame, 2019 - Elsevier
The coupling between fluid strain rate, local flame extinction, hydrodynamic instability, and
flame lift-off was studied in premixed swirl flames using multi-kHz repetition-rate OH …
flame lift-off was studied in premixed swirl flames using multi-kHz repetition-rate OH …
Modelling the response of a turbulent jet flame to acoustic forcing in a linearized framework using an active flame approach
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 …
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
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 …
which is characterized by the emergence of helical vortices, including the precessing vortex …
Complex network analysis of a premixed swirling flame influenced by precessing vortex core
This work investigates the influences of precessing vortex cores (PVCs) on the coherent
interactions in the transient flow and heat release fields of a weak premixed swirling flame …
interactions in the transient flow and heat release fields of a weak premixed swirling flame …
Experimental and numerical studies of the effects of the contraction ratios on the swirling flow characteristics of the model combustor outlet in lean gas turbines
MY Hashim, J Bae, J Lee - Applied Thermal Engineering, 2023 - Elsevier
Abstract Large Eddy Simulation (LES) is utilized in this work to study isothermal turbulent
swirling flow characteristics for a lean partially premixed gas turbine model combustor. The …
swirling flow characteristics for a lean partially premixed gas turbine model combustor. The …
Impact of precessing vortex core dynamics on the thermoacoustic instabilities in a swirl-stabilized combustor
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 …
swirl-stabilized flames, such as those in modern gas turbine engines. In this study, we …
Mean field coupling mechanisms explaining the impact of the precessing vortex core on the flame transfer function
The flame transfer functions (FTF) is a key quantity to assess the thermoacoustic properties
of combustion systems. It is known to depend on the hydrodynamic instabilities of the …
of combustion systems. It is known to depend on the hydrodynamic instabilities of the …
The effect of swirling injector geometry on the flow dynamics of precessing vortex core
J Zhu, Y Yang, Y Fang, G Wang, Y Zheng - Physics of Fluids, 2024 - pubs.aip.org
Precessing vortex core (PVC), a typical vortex structure, universally exists in swirling flow
fields and originates from the Kelvin–Helmholtz instability of the swirling shear layer. In the …
fields and originates from the Kelvin–Helmholtz instability of the swirling shear layer. In the …