Results 11 to 20 of about 1,253,627 (291)

Differences of Flow Patterns and Pressure Pulsations in Four Prototype Pump-Turbines during Runaway Transient Processes

Energies, 2020
Frequent working condition conversions in pumped-storage power stations often induce stability problems, especially when the operating point enters the S-shaped region, during which flow transitions and pressure fluctuations are serious.
Zhiyan Yang, Zirui Liu, Yongguang Cheng, Xiaoxi Zhang, Ke Liu, Linsheng Xia   +5 more
doaj   +2 more sources

Influence of Weak Compressibility on the Hydrodynamic Performance Evaluation of Pump Turbines in the Pump Mode

Science and Technology of Nuclear Installations, 2022
In general, weak compressibility is one of the properties of liquids. That is, in actual operation of hydraulic machinery, the flow is weakly compressible.
Fangfang Zhang, Na Li, Di Zhu, Ruofu Xiao, Weichao Liu, Ran Tao   +5 more
doaj   +2 more sources

Extension of Operating Range in Pump-Turbines. Influence of Head and Load

Energies, 2017
Due to the increasing share of new renewable energies like wind and solar in the generation of electricity the need for power regulation and energy storage is becoming of paramount importance.
Carme Valero, Mònica Egusquiza, Eduard Egusquiza, Alexandre Presas, David Valentin, Matias Bossio   +5 more
doaj   +2 more sources

A Brief Review of Recent Research on Reversible Francis Pump Turbines in Pumped Storage Plants

Energies
As the core for energy conversion in pumped storage plants, the pump turbine is also a key component in the process of building a clean power grid, owing to its fast and accurate load regulation.
Xiuli Mao, Jiaren Hu, Zhongyong Pan, Pengju Zhong, Ning Zhang   +4 more
doaj   +2 more sources

Pump-Turbines in Conventional Hydropower Plants

, 2021
This paper proposes an innovative approach to retrofit existing hydropower plants with suitable upper and lower reservoirs into pumped storage. The conventional methods are both comprehensive and expensive, mainly due to the increased risk of cavitation ...
Helene Njølstad Dagsvik, P. Storli
semanticscholar   +1 more source

Performance of a centrifugal pump running in inverse mode [PDF]

, 2004
This paper presents the functional characterization of a centrifugal pump used as a turbine. It shows the characteristics of the machine involved at several rotational speeds, comparing the respective flows and heads.
Engeda A., Fernández J., Kittredge C. P., Knapp R. T., Neumann B., Stepanoff A. J.   +5 more
core   +1 more source

Numerical study on the internal flow field of a reversible turbine during continuous guide vane closing [PDF]

, 2017
The unsteady flow field in a reversible pump-turbine is investigated during the continuous load rejection using a 3D computational fluid dynamic analysis.
Benini, Ernesto, Dal Monte, Andrea, Mao, Xiuli, Zheng, Yuan   +3 more
core   +1 more source

Research on a power smoothing control strategy for energy storage hydraulic wind turbines

Energy Science & Engineering, 2023
To solve the problem of large output power fluctuations in wind turbines and improve grid adaptability, a hydraulic energy storage system is introduced in traditional hydraulic wind turbines.
Wei Gao, Yankang Zhang, Lin Zhang, Chao Ai, Lijuan Chen   +4 more
doaj   +1 more source

Convolutional Neural Network Identification of Stall Flow Patterns in Pump–Turbine Runners

Energies, 2022
Stall flow patterns occur frequently in pump turbines under off-design operating conditions. These flow patterns may cause intensive pressure pulsations, sudden increases in the hydraulic forces of the runner, or other adverse consequences, and are some ...
Junjie Wu, Xiaoxi Zhang
doaj   +1 more source

Experimental measurements of the natural frequencies and mode shapes of rotating disk-blades-disk assemblies from the stationary frame [PDF]

, 2019
Determining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect the normal operation of the machine, or ...
Egusquiza Estévez, Eduard, Egusquiza Montagut, Mònica, Presas Batlló, Alexandre, Valentín Ruiz, David, Valero Ferrando, Ma. del Carmen   +4 more
core   +2 more sources