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Alexandre Presas
Researcher at Polytechnic University of Catalonia
Publications - 67
Citations - 929
Alexandre Presas is an academic researcher from Polytechnic University of Catalonia. The author has contributed to research in topics: Turbine & Francis turbine. The author has an hindex of 16, co-authored 53 publications receiving 641 citations. Previous affiliations of Alexandre Presas include Tsinghua University.
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Journal ArticleDOI
Power Swing Generated in Francis Turbines by Part Load and Overload Instabilities
David Valentin,Alexandre Presas,Eduard Egusquiza,Carme Valero,Mònica Egusquiza,Matias Bossio +5 more
TL;DR: In this paper, the authors focused on the detection of cavitation surge and its relationship with the output power swings in a large prototype Francis turbine, and extensive experimental tests for different operating conditions have been carried out in the prototype turbine (444 MW of rated power).
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Condition monitoring of pump-turbines. New challenges
TL;DR: In this paper, the vibration monitoring of large reversible pump-turbine (RPT) units has been analyzed and the results obtained after 15 years of monitoring several power plants with this type of machines have been used for the analysis.
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Experimental study on the added mass and damping of a disk submerged in a partially fluid-filled tank with small radial confinement
TL;DR: In this paper, the influence of the axial nearby rigid distance on the dynamic response of a submerged disk is evaluated when the radial gap is very small, and the effects of the fluid depth and fluid viscosity on the natural frequencies and damping ratio of the submerged disk are studied.
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Accurate Determination of the Frequency Response Function of Submerged and Confined Structures by Using PZT-Patches†
Alexandre Presas,David Valentin,Eduard Egusquiza,Carme Valero,Mònica Egusquiza,Matias Bossio +5 more
TL;DR: A method to accurately determine the Frequency Response Function (FRF) of submerged and confined structures by using PZTs is developed and validated and experimentally proves the best excitation characteristic to obtain also the damping ratios and proposes a procedure to fully determine the FRF.
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Fatigue life estimation of Francis turbines based on experimental strain measurements: Review of the actual data and future trends
TL;DR: In this paper, the problem of fatigue in hydraulic turbines is discussed, focusing on the experimental data available for static and dynamic stresses, and the relative damage of different operating conditions and useful life estimation of the turbine, based on past strain measurements of the runner, are addressed.