The suitability of different swirl number definitions for describing swirl flows: Accurate, common and (over-) simplified formulations

G Vignat, D Durox, S Candel - Progress in Energy and Combustion Science, 2022 - Elsevier
Swirling flows are of considerable practical importance. They are used for example to
increase heat transfer in pipes or to stabilize flames at a distance from the injector unit by …

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 …

Effect of hydrogen enrichment on the dynamics of a lean technically premixed elevated pressure flame

I Chterev, I Boxx - Combustion and Flame, 2021 - Elsevier
The heat release distribution, combustion instability characteristics and flow dynamics of
lean swirl-stabilized flames of hydrogen enriched natural gas were studied using time …

Investigation of flame structure and precessing vortex core instability of a gas turbine model combustor with different swirler configurations

A Mardani, B Asadi, AA Beige - Physics of Fluids, 2022 - pubs.aip.org
Numerical simulation of a dual-swirl gas turbine model combustor is performed under cold
and reacting flow conditions using a three-dimensional unsteady Reynolds-averaged Navier …

Investigation of flame and flow response in the swirler with different divergence cups and central body under external excitation

Y Yang, G Wang, H Wu, Z Zhu, C Ma, J Li - Physics of Fluids, 2023 - pubs.aip.org
Effects of swirl divergence cup and the central bluff body on premixed flame response with
external excitation are experimentally investigated. Flame transfer functions (FTFs) …

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 …

Hysteresis and turbulent vortex breakdown in transitional swirling jets

P Moise, J Mathew - Journal of Fluid Mechanics, 2021 - cambridge.org
Vortex breakdown (VB) in unconfined swirling jets occurs as either a bubble form of vortex
breakdown (BVB) or a conical form of vortex breakdown (CVB). This computational study …

Transient dynamics of the precessing vortex core in an intermittently shape-transitioning swirl flame

J Zhang, X Hui, Q An, AM Steinberg - Combustion and Flame, 2023 - Elsevier
The transient dynamics of the precessing vortex core (PVC), a globally unstable mode, in an
intermittently shape-transitioning swirl flame is investigated by means of simultaneous OH …

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 …

Swirl number and nozzle confinement effects in a flat-vane axial swirler

IV Litvinov, DA Suslov, EU Gorelikov… - International Journal of …, 2021 - Elsevier
This paper presents the results of a parametric experimental study of free swirling flow at the
exit of a flat-vane axial swirler. A total of 16 data sets were acquired by combining four …