Dynamics and bifurcations of laminar annular swirling and non-swirling jets

CM Douglas, BL Emerson, TC Lieuwen - Journal of Fluid Mechanics, 2022 - cambridge.org
This paper presents bifurcation analyses characterising the nonlinear dynamics of fully
developed laminar annular jets with respect to the centrebody diameter is increased …

Influence of inner shear layer on the emergence of central recirculation zone in a V-shaped premixed swirling flame

Q Wang, Y Ren, M Gu, B Yu, X Feng, F Qi, X Xia - Physics of Fluids, 2023 - pubs.aip.org
This paper presents an experimental study on the emergence of the central recirculation
zone (CRZ) in a basic V-shaped premixed swirling flame, using simultaneous measurement …

Nonlinear dynamics of fully developed swirling jets

CM Douglas, BL Emerson, TC Lieuwen - Journal of Fluid Mechanics, 2021 - cambridge.org
This paper characterises the steady and time-periodic behaviour of swirling jets using
numerical bifurcation analysis. Its objective is to elucidate the dynamics of fully developed …

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 …

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 …

Impact of a centerbody on the unsteady flow dynamics of a swirl nozzle: Intermittency of precessing vortex core oscillations

S Gupta, S Shanbhogue… - … for Gas Turbines …, 2022 - asmedigitalcollection.asme.org
The precessing vortex core (PVC) is a self-excited flow oscillation state occurring in swirl
nozzles. This is caused by the presence of a marginally unstable hydrodynamic helical …

Impact of Hydrogen Addition on the Thermoacoustic Instability and Precessing Vortex Core Dynamics in a CH4/H2/Air Technically Premixed Combustor

A Datta, S Gupta, I Chterev… - … of Engineering for …, 2022 - asmedigitalcollection.asme.org
We study the impact of H 2 enrichment on the unsteady flow dynamics and thermoacoustic
instability in the prediction and control of instabilities in industrial turbines (PRECCINSTA) …

Forced flow response analysis of a turbulent swirling annular jet flame

CM Douglas, BL Emerson, S Hemchandra… - Physics of …, 2021 - pubs.aip.org
This study of an externally forced, amplifier-type turbulent reacting swirling annular jet
presents a low-order model for the flow response to transverse acoustic excitation and …

Insight into the flow dynamics of a high shear injector equipped with center-body: Suppression of precessing vortex core oscillations

S Kumar, S Basu - Physics of Fluids, 2022 - pubs.aip.org
A precessing vortex core (PVC) is a self-excited helical instability that results from the
precession of the vortex core around the flow axis in the upstream region of a vortex …