Results 1 to 10 of about 1,422 (133)

The pump as a turbine: A review on performance prediction, performance improvement, and economic analysis [PDF]

Heliyon
Pumps as Turbines (PATs) are known for their ability to replace conventional turbines in Pico/micro-hydropower plants. However, selecting a suitable pump and estimating its performance in reverse mode is a challenging task. The overall efficiency of PATs
Abdulbasit Nasir, Edessa Dribssa, Misrak Girma   +2 more
doaj   +2 more sources

A new method for regulating Pelton turbine based on ejection of discharged flow [PDF]

E3S Web of Conferences, 2023
Hydropower plants (HPPs) contribute a significant share of Russia’s electricity generation. With the prospects of developing this sector and harnessing the hydroenergy potential, it is necessary to consider methods for modernizing hydroelectric ...
Liamasov A K, Denisov K E, Biriulin M A
doaj   +1 more source

Archimedean screw as fish-friendly turbines for harnessing hydropower potential [PDF]

E3S Web of Conferences, 2021
Hydraulic energy is one of the most important sources of renewable energy today. It is also a complementary source to other renewable energy sources, being the only one that offers an important nonpolluting storage capacity (through pump storage ...
Purece Cristian, Corlan Lilica
doaj   +1 more source

Exploring the Mechanism of Strong-Pressure Fluctuation under Partial Load in the Turbine Mode of Pump Turbines for Hydro and Marine Power Storage

Journal of Marine Science and Engineering, 2023
As a core component of pumped storage power plants for hydro and marine power storage, this paper investigates the mechanism of pressure pulsation fluctuations under different load conditions to improve the efficiency and operational stability of the ...
Jiahao Lu, Wei Yan, Ran Tao, Zhengwei Wang, Di Zhu   +4 more
doaj   +1 more source

Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection

Energies, 2020
In load rejection transitional processes in pumped-storage plants (PSPs), the process of closing pump turbines, including guide vane (GVCS) and ball valve closing schemes (BVCS), is crucial for controlling pulsating pressures and water hammer.
Jiawei Ye, Wei Zeng, Zhigao Zhao, Jiebin Yang, Jiandong Yang   +4 more
doaj   +1 more source

An Analysis of the Minimum Pressure Coefficient Criterion Applied to the Axial-flow Pump Design – A Case Study for a Circulating Water Channel [PDF]

Journal of Applied Fluid Mechanics, 2023
An analysis of the minimum pressure coefficient on the suction side of the axial-flow pump blades is presented as a design criterion. A Matlab code is used to improve the computer aided design process efficiency and quality.
R. V. Correia Ramalho, A. L. Amarante Mesquita, N. Manzanares Filho   +2 more
doaj   +1 more source

Optimal parameters of elliptical groove gas film face seal with bidirectional rotational characteristics [PDF]

International Journal of Fluid Engineering
The performance of gas film face seals is substantially affected by the geometric features of the texture on the seal face. To enhance the design of elliptical groove face seals for efficient bidirectional rotation, a comprehensive theoretical analysis ...
Yuansen Song, Xiaomei Guo, Hyunjong Kim, Gomaa Ahmed   +3 more
doaj   +1 more source

Internal Flow Phenomena of Two-Way Contra-Rotating Axial Flow Pump-Turbine in Pump Mode under Variable Speed [PDF]

Journal of Applied Fluid Mechanics, 2022
This paper investigated the variable speed operation of a two-way contra-rotating axial flow pump–turbine in pump mode. When counter-rotating impellers operate at the same speed, a significant difference exists in the shaft power of the two impellers ...
C. An, Y. Chen, R. Zhu, X. Wang, Y. Yang, J. Shi   +5 more
doaj   +1 more source

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   +1 more source

Flow-Induced Instabilities in Pump-Turbines in China

Engineering, 2017
The stability of pump-turbines is of great importance to the operation of pumped storage power (PSP) stations. Both hydraulic instabilities and operational instabilities have been reported in PSP stations in China.
Zhigang Zuo, Shuhong Liu
doaj   +1 more source