Experimental Study and Numerical Simulation of the Flindt Draft Tube Rotating Vortex
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In this paper, the dynamics of the rotating vortex taking place in the discharge ring of a Francis turbine for partial flow rate operating conditions and cavitation free conditions are studied by carrying out both experimental flow survey and numerical simulations.Abstract:
The dynamics of the rotating vortex taking place in the discharge ring of a Francis turbine for partial flow rate operating conditions and cavitation free conditions is studied by carrying out both experimental flow survey and numerical simulations. 2D laser Doppler velocimetry, 3D particle image velocimetry, and unsteady wall pressure measurements are performs to investigate thoroughly the velocity and pressure fields in the discharge ring and to give access to the vortex dynamics. Unsteady RANS simulation are performed and compared to the experimental results. The computing flow domain includes the rotating runner and the elbow draft tube. The mesh size of 500,000 nodes for the 17 flow passages of the runner and 420,000 nodes for the draft tube is optimized to achieve reasonable CPU time for a good representation of the studied phenomena. The comparisons between the detailed experimental flow field and the CFD solution yield to a very good validation of the modeling of the draft tube rotating vortex and, then, validate the presented approach for industrial purpose applications.read more
Citations
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Journal ArticleDOI
A review of cavitation in hydraulic machinery
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A review of methods for vortex identification in hydroturbines
TL;DR: A review of vortex identification methods for hydroturbines can be found in this paper, where the authors classified five different taxonomies based on five types of vortices (e.g. vortex rope in draft tube, Karman vortex, and inter-blade vortex) and discussed experimental techniques for vortex observation.
Journal ArticleDOI
Analysis of the Swirling Flow Downstream a Francis Turbine Runner
TL;DR: In this article, an experimental and theoretical investigation of the flow at the outlet of a Francis turbine runner is carried out in order to elucidate the causes of a sudden drop in the draft tube pressure recovery coefficient at a discharge near the best efficiency operating point.
Journal ArticleDOI
Experimental and Numerical Studies for a High Head Francis Turbine at Several Operating Points
TL;DR: In this article, a complete Hill diagram was constructed and pressure-time measurements were performed at several operating conditions over the entire range of power generation by installing pressure sensors in the rotating and stationary domains of the turbine.
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Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow
TL;DR: In this article, a particle image velocimetry (PIV) system was used to investigate the flow velocity field in the case of a developing cavitation vortex, the so-called vortex rope, at the outlet of a Francis turbine runner.
References
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Optical Measurement Techniques for Experimental Analysis of Hydraulic Turbines Rotor - Stator Interaction
TL;DR: In this article, a description of the rotor/stator interaction, at the runner inlet and outlet, is presented for a hydraulic turbine industrial model, which leads to a better understanding of rotor-stator interactions and of the influence of the unsteady components in a hydraulic machine operation.
Evaluation sur modèle réduit pour une prédiction de la stabilité de fonctionnemnt des turbines Francis
TL;DR: In this paper, the authors present a set of evaluation criteria for the elaboration of a diagnosis of the stability of operation of a full-size turbine in its piping system, illustrated using practical examples from published works and from the numerous experiments performed by the author.
Pressure Wall Measurements in the whole Draft Tube : Steady and Unsteady Analysis
Jorge Arpe,François Avellan +1 more
TL;DR: Using Smart Source Parsing 9-12 September pp 3 Reference LMH-CONF-2002-002 Record created on 2005-11-04, modified on 2017-05-10 as discussed by the authors.
Proceedings ArticleDOI
3d piv and ldv measurements at the outlet of a francis turbine draft tube
TL;DR: In this paper, a drop in the pressure recovery coefficient is observed for a small variation of the flow rate in elbow draft tubes of a hydraulic turbine, and the flow field analysis for 4 nearby operating points have been investigated for velocity and turbulence fields investigation in the outlet section of the studied draft tube.