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Development of Shroudless Francis Turbine
Volume 1A: Symposia, Part 2, 2015In this study, new design concepts were structured by DOE based on internal flow evaluation by CFD to realize the efficiency improvement, reliability improvement and cost reduction of a medium or small capacity hydro turbine. As a part of new concepts, shroudless type and shroud liner type runner shape were adopted. In shroud liner type, shroud line of
Yohei Nakamura +4 more
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Water
With the requirement of flexible operation of hydraulic turbine units, Francis turbine units have to adjust their output into extended operating ranges in order to match the demand of the power grid, which leads to more off-design conditions.
Weiqiang Zhao +5 more
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With the requirement of flexible operation of hydraulic turbine units, Francis turbine units have to adjust their output into extended operating ranges in order to match the demand of the power grid, which leads to more off-design conditions.
Weiqiang Zhao +5 more
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Large-eddy simulations of Francis turbine flow control by radial jets
The Physics of FluidsFrancis turbine operation often experiences part load conditions, at which precessing vortex core (PVC) and double-helix structures can occur, limiting the stable operation range.
I. I. Lutchenko +4 more
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Influence of guide vane opening on channel vortex and pressure pulsation in Francis turbine runners
The Physics of FluidsIn order to investigate the impact of guide vane opening on channel vortex and pressure pulsation within the runner of a Francis turbine, this research examines the cavitation phenomenon, channel vortex phenomenon, and flow field characteristics of a ...
Jiayang Pang +8 more
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Proceedings of the Institution of mechanical engineers. Part A, journal of power and energy, 2023
Pressure fluctuations caused by helical vortex rope in the draft tube is one of the main reasons for the instability of Francis turbines. Previous studies showed that drilling holes on runner cone can reduce the amplitude of pressure fluctuation. In this
Yonglin Qin +5 more
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Pressure fluctuations caused by helical vortex rope in the draft tube is one of the main reasons for the instability of Francis turbines. Previous studies showed that drilling holes on runner cone can reduce the amplitude of pressure fluctuation. In this
Yonglin Qin +5 more
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Measurement science and technology, 2021
This paper presents a method to detect the bearing defects in Francis turbine by minimal entropy deconvolution (MED) filter making use of a sound signal.
Govind Vashishtha, Rajesh Kumar
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This paper presents a method to detect the bearing defects in Francis turbine by minimal entropy deconvolution (MED) filter making use of a sound signal.
Govind Vashishtha, Rajesh Kumar
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Numerical Simulation of Francis Turbine
Volume 1A, Symposia: Advances in Fluids Engineering Education; Turbomachinery Flow Predictions and Optimization; Applications in CFD; Bio-Inspired Fluid Mechanics; Droplet-Surface Interactions; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES, and Hybrid RANS/LES Methods, 2014This paper presents the results of modelling of the complete three-dimensional fluid flow through the spiral casing, stay vanes, guide vanes, and then through the Francis turbine runner to the draft tube of the Derbendikhan power station. To investigate the flow in the Francis turbine and also to compute stress distribution in the runner blades, a ...
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The Physics of Fluids, 2022
Vortex rope formation at part load (PL) with cavitation inception causes pressure fluctuations inside the draft tube (DT) of a Francis turbine which may fail the turbine due to resonance and erosion.
M. A. Shahzer +3 more
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Vortex rope formation at part load (PL) with cavitation inception causes pressure fluctuations inside the draft tube (DT) of a Francis turbine which may fail the turbine due to resonance and erosion.
M. A. Shahzer +3 more
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A study of irregularity of reaction in Francis turbines
Journal of the American Institute of Electrical Engineers, 1923Irregularity of reaction in hydraulic machinery causing vibration has up to the last few years been of relatively little importance and treated as a more or less necessary evil. With the advent of larger units, particularly for high heads, it became of prime importance that there be little or no vibration.
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Renewable Energy, 2021
When a Francis turbine operates over an extended range of regimes far from the best efficiency point, the formation of a helical precessing vortex rope can lead to reduced efficiency, severe pressure fluctuations, and power swings.
Xing Zhou +3 more
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When a Francis turbine operates over an extended range of regimes far from the best efficiency point, the formation of a helical precessing vortex rope can lead to reduced efficiency, severe pressure fluctuations, and power swings.
Xing Zhou +3 more
semanticscholar +1 more source