Results 31 to 40 of about 6,231 (266)

Transient Flow-Induced Stress Investigation on a Prototype Reversible Pump–Turbine Runner

Energies
Pump–turbine units with high heads are subjected to strong pressure pulsations from the unsteady transient flow in fluid channels, which can produce severe vibrations and high stresses on the pump–turbine structural components.
Dehao Zhang, Qiang Quan, Xingxing Huang, Zhengwei Wang, Biao Wang, Yunfeng Xiao   +5 more
doaj   +1 more source

Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes

International Journal of Rotating Machinery, 2018
In this study, a counter-rotating-type pump-turbine unit was optimized to improve the pump and turbine mode efficiencies simultaneously. Numerical analysis was carried out by solving three-dimensional Reynolds-averaged Navier–Stokes equations using the ...
Jin-Woo Kim, Jun-Won Suh, Young-Seok Choi, Kyoung-Yong Lee, Toshiaki Kanemoto, Jin-Hyuk Kim   +5 more
doaj   +1 more source

Numerical Analysis on the Hydraulic Thrust and Dynamic Response Characteristics of a Turbine Pump

Energies, 2022
Pumps as turbines are widely used in the world, wherein the hydraulic thrust of a turbine pump is one of the key factors affecting the safe and stable operation of a unit.
Linghua Kong, Jingwei Cao, Xiangyang Li, Xulei Zhou, Haihong Hu, Tao Wang, Shuxin Gui, Wenfa Lai, Zhongfeng Zhu, Zhengwei Wang, Yan Liu   +10 more
doaj   +1 more source

Compressible Simulation of Rotor-Stator Interaction in Pump-Turbines [PDF]

International Journal of Fluid Machinery and Systems, 2010
This work investigates the influence of water compressibility on pressure pulsations induced by rotor-stator interaction (RSI) in hydraulic machinery, using the commercial CFD solver ANSYS-CFX. A pipe flow example with harmonic velocity excitation at the inlet plane is simulated using different grid densities and time step sizes.
J Yan, J Koutnik, U Seidel, B Hübner
openaire   +1 more source

Selective hydrometallurgical recovery of gold by using low-cost biomass waste: Kiwi peel

Adsorption Science & Technology
Utilization of kiwi peel (KP) is proposed for gold recovery from electronic wastes (e-wastes). KP was simply modified by dehydration pretreatment with concentrated sulfuric acid.
Dan Yu, Xiaomei Guo, Yang Liu
doaj   +1 more source

Flow-Induced Vibration of Non-Rotating Structures of a High-Head Pump-Turbine during Start-Up in Turbine Mode

Energies, 2022
Pumped storage-power plants play an extremely important role in the modern smart grid due to their irreplaceable advantages in load peak-valley regulation, frequency modulation, and phase modulation.
Mengqi Yang, Weiqiang Zhao, Huili Bi, Haixia Yang, Qilian He, Xingxing Huang, Zhengwei Wang   +6 more
doaj   +1 more source

Detection of hydraulic phenomena in francis turbines with different sensors [PDF]

, 2019
Nowadays, hydropower is demanded to provide flexibility and fast response into the electrical grid in order to compensate the non-constant electricity generation of other renewable sources.
Egusquiza Estévez, Eduard, Egusquiza Montagut, Mònica, Presas Batlló, Alexandre, Valentín Ruiz, David, Valero Ferrando, Ma. del Carmen   +4 more
core   +2 more sources

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

Operation strategy of the heliostat field and receiver based on categorization of DNI fluctuation types

Scientific Reports
Transient changes in receiver heat are due to Direct Normal Irradiance (DNI) fluctuations, requiring operational strategies for receiver safety in cloudy weather.
Jing Nie, Weijia Wang, Xiaomei Guo, Jie Huang   +3 more
doaj   +1 more source

Numerical analysis on pump turbine runaway points

IOP Conference Series: Earth and Environmental Science, 2012
To research the character of pump turbine runaway points with different guide vane opening, a hydraulic model was established based on a pumped storage power station. The RNG k-? model and SMPLEC algorithms was used to simulate the internal flow fields. The result of the simulation was compared with the test data and good correspondence was got between
L Guo, J T Liu, L Q Wang, L Jiao, Z F Li
openaire   +1 more source