Journal ArticleDOI
Origin of the synchronous pressure fluctuations in the draft tube of Francis turbines operating at part load conditions
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TLDR
In this article, the authors investigated the birth and the growth of the synchronous pressure wave in Francis turbines by energy consideration of an azimuthal-temporal Fourier decomposition of the three dimensional numerical flow solutions in an axisymmetric draft tube geometry that is slightly disturbed at the wall.About:
This article is published in Journal of Fluids and Structures.The article was published on 2019-04-01. It has received 46 citations till now. The article focuses on the topics: Draft tube & Vortex.read more
Citations
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Journal ArticleDOI
Rotating vortex rope formation and mitigation in draft tube of hydro turbines – A review from experimental perspective
TL;DR: In this article, the authors comprehensively review the experimental investigations carried out to study the formation of RVR, its effects on turbine performance, and the methodologies developed to mitigate its impact.
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
A Review on Remedial Attempts to Counteract the Power Generation Compromise from Draft Tubes of Hydropower plants
TL;DR: Future CFD-assisted considerations mainly call for rare hybrid remedy, as no single method can adequately address all instability problems from the draft tube.
Journal ArticleDOI
Swirl number based transposition of flow-induced mechanical stresses from reduced scale to full-size Francis turbine runners
Arthur Favrel,J. Gomes Pereira Junior,Andres Müller,Christian R. Landry,Keita Yamamoto,François Avellan +5 more
TL;DR: In this article, a methodology to assess the vortex behavior, the related pressure fluctuations and the resulting dynamic strains on the runner over the complete part load operating range is introduced, based on reduced scale physical model tests of a Francis turbine, including the measurement of the pressure and the load on runner with instrumented blades.
Journal ArticleDOI
Optimization of axial water injection to mitigate the Rotating Vortex Rope in a Francis turbine
TL;DR: In this article, the authors focused on the dynamics of RVR mitigation using the water injection method and the optimization of exergy loss during water injection using a reduced turbine geometry consisting of one stay vane, two guide vanes, one runner passage, and a complete draft tube.
References
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New development in freefem
TL;DR: First the freefem++ software deals with mesh adaptation for problems in two and three dimension, second, it solves numerically a problem with phase change and natural convection, and finally to show the possibilities for HPC the software solves a Laplace equation by a Schwarz domain decomposition problem on parallel computer.
MonographDOI
ARPACK Users' Guide: Solution of Large-Scale Eigenvalue Problems with Implicitly Restarted Arnoldi Methods
TL;DR: The Arnoldi factorization, the implicitly restarted Arnoldi method: structure of the Eigenvalue problem Krylov subspaces and projection methods, and more.
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A review of oscillation mechanisms and the role of the precessing vortex core (PVC) in swirl combustion systems
TL;DR: In this article, the authors reviewed the occurrence of the precessing vortex core (PVC) and other instabilities, which occur in, swirl combustion systems whilst identifying mechanisms, which allow coupling between the acoustics, combustion and swirling flow dynamics to occur.
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The structure of vortex breakdown
TL;DR: In this article, the authors present a survey of vortex breakdown, which is a disturbance characterized by the formation of an internal stagnation point on the vortex axis, followed by reversed flow in a region of limited axial extent.
Journal ArticleDOI
Theory of the vortex breakdown phenomenon
TL;DR: In this paper, it is shown that vortex breakdown is not a manifestation of instability or of any other effect indicated by study of infinitesimal disturbances alone, but instead a finite transition between two dynamically conjugate states of axisymmetric flow, analogous to the hydraulic jump in open-channel flow.