Journal ArticleDOI
Optimization of blade high-pressure edge to reduce pressure fluctuations in pump-turbine hump region
Reads0
Chats0
TLDR
In this article, two optimization strategies for high-pressure edge shape of runner blades have been proposed to reduce the high-amplitude pressure fluctuation in the hump region, and a large eddy simulation was performed to study the optimization effect.About:
This article is published in Renewable Energy.The article was published on 2022-01-01. It has received 18 citations till now. The article focuses on the topics: Shroud & Amplitude.read more
Citations
More filters
Journal ArticleDOI
Influence of guide vane profile on the flow energy dissipation in a reversible pump-turbine at pump mode
TL;DR: In this paper , the influence of two guide vane profiles on performance is clarified, and the method to judge the severity of Q-H instability is proposed. And the combination of experimental method and numerical simulation method is adopted.
Journal ArticleDOI
Investigation on the hump region generation mechanism of pump mode in low-head pumped hydro storage unit
TL;DR: In this paper , experiments and numerical simulations were carried out on the low-head pumped hydro storage unit in pump mode, and the following results were obtained: the dominant unstable flow structures that induce the formation of the hump region are the leading edge backflow on the blade inlet shroud side and the horn-like vortex on the turbine outlet hub side.
Journal ArticleDOI
Influence of geometric factors at runner outlet on the hump characteristics of a pump-turbine
TL;DR: In this paper , three different distribution plans of geometric factors at runner outlet were proposed and numerical simulated using the SST (shear stress transport) k-ω turbulence model, and the results showed good agreement with the experimental data.
Journal ArticleDOI
Understanding loss generation mechanisms in a centrifugal pump using large eddy simulation
TL;DR: In this paper , a detailed analysis based on large eddy simulation (LES) is presented to provide insight on the loss generation mechanisms in inline centrifugal pumps operating under realistic conditions, and the equations for the resolved, subgrid and wall entropy generation terms are derived using the LES filtering and Smagorinsky-Lilly formalism.
Journal ArticleDOI
Effects of guide vane shape on the performances of pump-turbine: A comparative study in energy storage and power generation
TL;DR: In this article , the authors compared the FED difference of two typical guide vanes in turbine mode and pump mode based on Computational Fluid Dynamics (CFD) and entropy production method.
References
More filters
Journal ArticleDOI
Entropy production analysis of hysteresis characteristic of a pump-turbine model
Journal ArticleDOI
Frequencies in the Vibration Induced by the Rotor Stator Interaction in a Centrifugal Pump Turbine
TL;DR: In this paper, a theoretical analysis was carried out to predict and explain the frequencies and amplitudes of the rotor stator interaction (RSI) in large pump turbines, and a corrective action is proposed as a result of the analysis and after it is carried out in one of the units, the vibration levels are reduced.
Journal ArticleDOI
Pressure fluctuations in the vaneless space of High-head pump-turbines—A review
TL;DR: In high-head pump-turbines, observations in the engineering field show that the most detrimental hydraulic instabilities are pressure fluctuations in the vaneless space, which can cause vibrations and fatigue failures in hydraulic components as mentioned in this paper.
Journal ArticleDOI
Failure investigation of a large pump-turbine runner
Eduard Egusquiza,Carme Valero,Xingxing Huang,Esteve Jou,Alfredo Guardo,Cristian G. Rodríguez +5 more
TL;DR: In this paper, a failure investigation was conducted on a high-pressure machine with a large pump-turbine runner that was 2.9 m in diameter and had a maximum discharge rate of 32 m 3 /s.
Journal ArticleDOI
Vibration Behavior and Dynamic Stress of Runners of Very High Head Reversible Pump-turbines
TL;DR: In this paper, the authors investigated the effects of pumpturbine runners on the strength of pump-to-turbinet runners and found that the hydraulic excitation force developed by the interference of rotating runner blades with guide vane wakes sometimes would induce such heavy vibration of runner.