Fatigue life estimation of Francis turbines based on experimental strain measurements: Review of the actual data and future trends
A Presas, Y Luo, Z Wang, B Guo - Renewable and Sustainable Energy …, 2019 - Elsevier
Due to the massive entrance of new renewable energies such as wind or solar, hydraulic
turbines have to work far from its designed point and withstanding multiple transients, such …
turbines have to work far from its designed point and withstanding multiple transients, such …
Aspects of vortex breakdown phenomenon in hydraulic turbines
Operational flexibility of hydraulic turbines is impeded by the vortex breakdown
phenomenon. The phenomenon, a consequence of instability in vortical flows in general …
phenomenon. The phenomenon, a consequence of instability in vortical flows in general …
Fluid–structure interaction mechanisms leading to dangerous power swings in Francis turbines at full load
Hydropower plants play an important regulatory role in the large scale integration of volatile
renewable energy sources into the existing power grid. This duty however requires a …
renewable energy sources into the existing power grid. This duty however requires a …
New insight in Francis turbine cavitation vortex rope: role of the runner outlet flow swirl number
A Favrel, J Gomes Pereira Junior… - Journal of Hydraulic …, 2018 - Taylor & Francis
At part load operation, Francis turbines experience the development of a cavitation vortex
rope in the draft tube, whose precession acts as a pressure excitation source. In case of …
rope in the draft tube, whose precession acts as a pressure excitation source. In case of …
Effect of modified draft tube with inclined conical diffuser on flow instabilities in Francis turbine
X Zhou, C Shi, K Miyagawa, H Wu - Renewable Energy, 2021 - Elsevier
When a Francis turbine operates over an extended range of regimes far from the best
efficiency point, the formation of a helical precessing vortex rope can lead to reduced …
efficiency point, the formation of a helical precessing vortex rope can lead to reduced …
Unsteady regimes and pressure pulsations in draft tube of a model hydro turbine in a range of off-design conditions
I Litvinov, S Shtork, E Gorelikov, A Mitryakov… - … Thermal and Fluid …, 2018 - Elsevier
We report on experimental study of flow and pressure pulsations in draft-tube of a laboratory
air model of Francis-99 hydro-turbine operating over a broad range of regimes employing a …
air model of Francis-99 hydro-turbine operating over a broad range of regimes employing a …
Experimental evidence of inter-blade cavitation vortex development in Francis turbines at deep part load condition
Francis turbines are subject to various types of cavitation flow depending on the operating
condition. To enable a smooth integration of the renewable energy sources, hydraulic …
condition. To enable a smooth integration of the renewable energy sources, hydraulic …
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 …
[HTML][HTML] An Assessment of the Embedding of Francis Turbines for Pumped Hydraulic Energy Storage
In this paper, analyses of Francis turbine failures for powerful Pumped Hydraulic Energy
Storage (PHES) are conducted. The structure is part of PHES Chaira, Bulgaria (HA4—Hydro …
Storage (PHES) are conducted. The structure is part of PHES Chaira, Bulgaria (HA4—Hydro …
Swirl number based transposition of flow-induced mechanical stresses from reduced scale to full-size Francis turbine runners
At part load conditions, Francis turbines are subject to the emergence of a hydrodynamic
instability in their draft tube, referred to as precessing vortex rope. It induces pressure …
instability in their draft tube, referred to as precessing vortex rope. It induces pressure …