An overview of active control techniques for vortex rope mitigation in hydraulic turbines
S Shtork, D Suslov, S Skripkin, I Litvinov, E Gorelikov - Energies, 2023 - mdpi.com
This review addresses the current state of research into active control and suppression of
vortex rope in hydroturbines under off-design operating conditions. Only active control …
vortex rope in hydroturbines under off-design operating conditions. Only active control …
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 …
Modal decomposition of the precessing vortex core in a hydro turbine model
We report on the experimental study of a precessing vortex core (PVC) in an air model of a
Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in …
Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in …
From snapshots to manifolds–a tale of shear flows
We propose a novel nonlinear manifold learning from snapshot data and demonstrate its
superiority over proper orthogonal decomposition (POD) for shedding-dominated shear …
superiority over proper orthogonal decomposition (POD) for shedding-dominated shear …
Stochastic modelling of a noise-driven global instability in a turbulent swirling jet
M Sieber, CO Paschereit… - Journal of Fluid …, 2021 - cambridge.org
A method is developed to estimate the properties of a global hydrodynamic instability in
turbulent flows from measurement data of the limit-cycle oscillations. For this purpose, the …
turbulent flows from measurement data of the limit-cycle oscillations. For this purpose, the …
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 …
FELiCS: a versatile linearized solver addressing dynamics in multi-physics flows
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 …
a brief description of the linearized flow solver FELiCS and reviews six applications of the …
[HTML][HTML] Centrifugal waves in tornado-like vortices: Kelvin's solutions and their applications to multiple-vortex development and vortex breakdown
JML Dahl - Monthly Weather Review, 2021 - journals.ametsoc.org
Abstract About 140 years ago, Lord Kelvin derived the equations describing waves that
travel along the axis of concentrated vortices such as tornadoes. Although Kelvin's vortex …
travel along the axis of concentrated vortices such as tornadoes. Although Kelvin's vortex …
On the relevance of the runner crown for flow instabilities in a Francis turbine
The precessing vortex core (PVC), also known as vortex rope, in a draft tube of a Francis-99
hydro turbine is investigated. The goal is to increase our comprehension of the root of the …
hydro turbine is investigated. The goal is to increase our comprehension of the root of the …
Analysis of the nutation and precession of the vortex core and the influence of operating parameters in a cyclone separator
P Zhang, G Chen, W Wang, G Zhang… - Chinese Journal of …, 2022 - Elsevier
Vortices motion in the anisotropic turbulent flow of cyclones makes a vital impact on flow
stability and collection performance. Nevertheless, there remains a lack of clarity in the …
stability and collection performance. Nevertheless, there remains a lack of clarity in the …