Results 31 to 40 of about 824,135 (227)

Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review

Advances in Mechanical Engineering, 2020
A pump-as-turbine is a hydraulic machine that can operate as a pump and turbine at the same time. Pump-as-turbine happens to be the most appropriate method for meeting the world’s energy demands, particularly in rural and isolated areas of a country ...
Stephen Ntiri Asomani, Jianping Yuan, Longyan Wang, Desmond Appiah, Fan Zhang   +4 more
doaj   +1 more source

A Methodology for Designing a Fish-Friendly Turbine Rotor Applied to High-Power Generation [PDF]

Journal of Applied Fluid Mechanics, 2023
Most large hydropower facilities employing conventional hydraulic turbines, e.g., Francis, Kaplan, or Bulb turbines, etc., cause significant harm to fish, resulting in high mortality rates, during turbine operation.
G. E. Niño Del Río, R. G. Ramirez Camacho, N. Manzanares Filho, W. de Oliveira, T. M. Arispe Angulo   +4 more
doaj   +1 more source

Multiobjective Optimal Control of FOPID Controller for Hydraulic Turbine Governing Systems Based on Reinforced Multiobjective Harris Hawks Optimization Coupling with Hybrid Strategies

Complex, 2020
The controlling parameter tuning of the hydraulic turbine governing system (HTGS) is always deduced under single operating condition and is not suitable for the changeable operating conditions of the hydraulic turbine.
Wenlong Fu, Q. Lu
semanticscholar   +1 more source

Influence of Axial Installation Deviation on the Hydraulic Axial Force of the 1000 MW Francis Runner in the Rated Operating Condition

Energies, 2023
To study the influence of the axial installation deviation of the runner on the hydraulic axial force of the 1000 MW Francis turbine unit, geometric models of the full flow passage of the Francis turbine with the runner sinking in the axial direction by ...
Yongsheng Liu, Chengming Liu, Yongsheng Zhang, Xingxing Huang, Tao Guo, Lingjiu Zhou, Zhengwei Wang   +6 more
doaj   +1 more source

Improvement of hydro-turbine draft tube efficiency using vortex generator

Advances in Mechanical Engineering, 2015
Computational fluid dynamics simulation was employed in a hydraulic turbine (from inlet tube to draft tube). The calculated turbine efficiencies were compared with measured results, and the relative error is 1.12%.
Xiaoqing Tian, Huachen Pan, Shuli Hong, Yuan Zheng   +3 more
doaj   +1 more source

Critical Hydraulic Eccentricity Estimation in Vertical Turbine Pump Impeller to Control Vibration

International Journal of Rotating Machinery, 2021
In many applications, pumps are tested against standard specifications to define the maximum allowable vibration amplitude limits of a pump. It is essential to identify the causes of vibration and methods to attenuate the same to ensure the safe and ...
Ravindra S. Birajdar, Appasaheb A. Keste, Shravan H. Gawande   +2 more
doaj   +1 more source

Effect of the Diameter of Pressure-Balance Pipe on Axial Hydraulic Thrust

Journal of Marine Science and Engineering, 2021
The axial hydraulic thrust has great influence on the safety and stability of a pump turbine. A common way to balance hydraulic thrust is to install a pressure-balance pipe, and the change in pipe diameter is one of the important factors affecting axial ...
Fei Zhang, Yue Lv, Zhonghua Gui, Zhengwei Wang   +3 more
doaj   +1 more source

Numerical Analysis of the Flow by Using a Free Runner Downstream the Francis Turbine

International Journal of Turbomachinery, Propulsion and Power, 2023
The current requirements of industrialized countries require the use of as much renewable energy as possible. One significant problem with renewable energy is that the produced power fluctuates.
Alin Ilie Bosioc, Raul-Alexandru Szakal, Adrian Stuparu, Romeo Susan-Resiga   +3 more
doaj   +1 more source

Double Helix Structure for Stable Flexural Actuation in Soft Robotics

Advanced Intelligent Systems, EarlyView.
This work introduces a double‐helical architecture for soft robotic actuators that enhances twisting resistance, increases output force, and minimizes undesired deformation. Actuators driven by shape‐memory alloy wires exhibit a roughly fivefold higher torsional/flexural stiffness ratio and 50% greater force output.
Louis Plottel, Richard Desatnik, Dinesh K. Patel, Philip LeDuc, Carmel Majidi   +4 more
wiley   +1 more source

Research on Diaphragm Pump Fault Diagnosis Method Based on Res‐DCB‐Net

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Nonstationary pressure pulsation signals of diaphragm pumps contain strong background noise and coupled characteristics. This makes it challenging to extract incipient fault features and to decouple faults with similar physical mechanisms. To address these limitations, this paper proposes a spatiotemporal fault diagnosis model named Res‐DCB ...
Jiahui Wang, Kaili Zhang, Yongxing Song, Zhaoxin Ma, Sitong Guan, Rongwang Chai, Kexiang Ceng, Jingting Liu   +7 more
wiley   +1 more source