Journal ArticleDOI
CFD study on prediction of vortex shedding in draft tube of Francis turbine and vortex control techniques
Anup Kc,Young-Ho Lee,Bhola Thapa +2 more
TLDR
In this article, the results obtained from the numerical analysis regarding prediction of unsteady vortex behavior at the draft tube and flow instabilities specific to Francis hydro turbines occurring at the part load operating regime, using ANSYS CFX.About:
This article is published in Renewable Energy.The article was published on 2016-02-01. It has received 63 citations till now. The article focuses on the topics: Starting vortex & Vortex shedding.read more
Citations
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Journal ArticleDOI
Numerical research of cavitation on Francis turbine runners
TL;DR: In this paper, the runner geometry of an actual hydroelectric power plant that was designed and implemented in 1960s, is redesigned with the help of the state of the art computational fluid dynamics techniques for cavitation free operation.
Journal ArticleDOI
Numerical investigations of the energy performance and pressure fluctuations for a waterjet pump in a non-uniform inflow
TL;DR: In this paper, the authors investigate the mechanism of the energy loss and pressure fluctuations caused by the non-uniform inflow for a waterjet pump, which is used in a wide range of high-speed marine vessels over 30 knots.
Journal ArticleDOI
Utility of CFD in the design and performance analysis of hydraulic turbines — A review
TL;DR: This work is a dedicated attempt to bring various aspects of computational hydrodynamic investigation of hydraulic turbines on a single platform by critically reviewing various computational methodologies for achieving different objectives of hydraulic design and performance evaluation of water turbines.
Journal ArticleDOI
Investigation of Rotating Vortex Rope formation during load variation in a Francis turbine draft tube
TL;DR: In this paper, the dynamics of the RVR formation during load variation employing transient numerical simulations were investigated using Shear Stress Transport-Scale Adaptive Simulation (SST-SAS) model to approximate the turbulent stresses.
Journal ArticleDOI
Francis turbine draft tube parameterization and analysis of performance characteristics using CFD techniques
TL;DR: In this paper, the initial geometry of the GAMM Francis turbine model was used to obtain a draft tube geometry that improves the hydrodynamic performance, and three types of curves were used to define the elbow contour geometry: logarithmic spiral format curve, circle arc format curve and denominated hyperbolic spiral curve.
References
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Journal ArticleDOI
Experimental Study and Numerical Simulation of the Flindt Draft Tube Rotating Vortex
TL;DR: 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.
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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.
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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.
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Analysis of S Characteristics and Pressure Pulsations in a Pump-Turbine With Misaligned Guide Vanes
TL;DR: Experimental investigations and computational fluid dynamics simulations of scale models with aligned guide vanes and MGVs with spectral analyses of the S curve characteristics and the pressure pulsations in the frequency and time-frequency domains at runaway conditions show clear trends in stable operation of pump-turbines.
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Suppression of Cavitation in Inducers by J-Grooves
TL;DR: In this paper, the authors developed a new method of controlling and suppressing cavitation in an inducer using shallow grooves, called "J-Grooves." J-Groove are installed on the casing wall near the blade tip to use the high axial pressure gradient that exists between the region just downstream of the inducer leading edge and the region immediately upstream of the turbopump.