Journal ArticleDOI
Experimental investigation of a Kaplan draft tube – Part I: Best efficiency point
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TLDR
In this paper, a modern Kaplan turbine model combined with laser Doppler anemometry and flush-mounted pressure sensors was used to investigate the effect of the draft tube on turbine efficiency.About:
This article is published in Applied Energy.The article was published on 2012-05-01. It has received 67 citations till now. The article focuses on the topics: Kaplan turbine & Draft tube.read more
Citations
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Journal ArticleDOI
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
Burden on hydropower units for short-term balancing of renewable power systems
Weijia Yang,Per Norrlund,Linn Saarinen,Linn Saarinen,Adam M. Witt,Brennan T. Smith,Jiandong Yang,Urban Lundin +7 more
TL;DR: A framework combining technical and economic indicators to analyze primary frequency control (PFC) on a timescale of seconds and develops a model integrating hydraulic, mechanical, and electrical subsystems to characterize efficiency loss, wear and fatigue, regulation mileage, and frequency quality.
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Numerical simulation of hysteresis characteristic in the hump region of a pump-turbine model
TL;DR: In this paper, steady simulations were performed to predict the hump characteristic as well as the hysteresis phenomenon in pump-turbine heads, and it was shown that the hump characteristics are caused by the decrease in the work of the runner and the increase in hydraulic loss induced from vortices in the guide/stay vanes and backflow near the shroud at the runner inlet.
Journal ArticleDOI
Experimental investigation of a Kaplan draft tube : Part II: Off-design conditions
TL;DR: In this paper, an investigation of a modern design Kaplan turbine model was performed in the draft tube with laser Doppler anemometry and flush-mounted pressure sensors, with a focus on the part load and high load operation of the turbine.
Journal ArticleDOI
Mechanism of high amplitude low frequency fluctuations in a pump-turbine in pump mode
TL;DR: In this article, unsteady numerical simulations were carried out in the pump mode of a pump-turbine at using the shear stress transport (SST) k-ω turbulence model.
References
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Book
Digital Signal Processing: Principles, Algorithms, and Applications
TL;DR: This paper presents a meta-analysis of the Z-Transform and its application to the Analysis of LTI Systems, and its properties and applications, as well as some of the algorithms used in this analysis.
Book
Unsteady Viscous Flows
TL;DR: In this article, the Keller-Box method was used to detect the start of a flow and the flow immediately after an impulsive start, followed by an order of magnitude analysis.
Journal ArticleDOI
Thirty years of numerical flow simulation in hydraulic turbomachines
Helmut Keck,Mirjam Sick +1 more
TL;DR: This paper reviews the main steps and breakthroughs in the methods that were made during this period of CFD, through the eyes of one particular water turbine company which spear-headed some of the first developments for practical applications.
Journal ArticleDOI
Swirl Flow in Conical Diffusers
TL;DR: In this article, five conical diffusers with different divergence angles were tested to clarify the influences of swirl on the pressure recovery coefficients, and the highest coefficient was observed in an 8-deg diffuser when the flow had a moderate swirl.