Results 241 to 250 of about 6,259 (275)
Some of the next articles are maybe not open access.
Simulation of Flow Through Pump-Turbine
1996For years Francis — type reversible pump — turbines have been applied to many pumped storage power plants over the world. So far, they have been used under peak shaving generating operation with AFC (automatic frequency control) function during daytime, and plain pumping — energy consuming — operation at night time. Recently, an adjustable speed pump —
Charles C. S. Song +5 more
openaire +1 more source
Computational Study of Pump Turbine: Partial Load Operations
Volume 3: Computational Fluid Dynamics; Micro and Nano Fluid Dynamics, 2020Abstract The performance of a pump-turbine under partial flow rates, 85%, 75%, and 65%, is studied using the LES model. The power signal, velocity, vorticity, and pressure field is presented over the blades and throughout the draft tube. Pressure fluctuations are probed at various locations over the wall of the draft tube.
Alparslan Oztekin +2 more
openaire +1 more source
Numerical Optimization of High Head Pump-Turbines
1996In order to cope with the technical challenges of high head pump-turbines, new methods like simultaneous engineering and numerical studies are required. In this paper the application of simultaneous engineering is shown with an example, as well as typical pump-turbine concepts and design features.
H. Buchmaier +3 more
openaire +1 more source
A pump-turbine combination for sea water desalination
World Pumps, 2000Abstract The inhabitants of geographical regions with a dry climate are not the only ones that suffer from a shortage of drinking water. Industries, farms, towns and villages located in remote areas are also affected in a similar manner. Thanks to a novel design out of a co-operation with Sulzer Hydro, Sulzer Pumps - a product division of Sulzer ...
Hans G. Scholl, Sulzer Roteq
openaire +1 more source
Investigation of the unstable flow phenomenon in a pump turbine
Science China Physics, Mechanics & Astronomy, 2014Instability of pump turbine with S-shaped curve is characterized by large fluctuations of rotational speed during the transient processes. For investigating this phenomenon, a numerical model based on the dynamic sliding mesh method (DSSM) is presented and used to numerically solve the 3D transient flow which is characterized by the variable rotation ...
JunLian Yin +3 more
openaire +1 more source
Experimental study of instability characteristics in pump turbines
Journal of Hydraulic Research, 2018Experiments in a medium specific-speed pump turbine scaled model are performed to investigate instability characteristics in pump mode, namely the head-drop phenomena.
Hongjuan Ran, Xianwu Luo
openaire +1 more source
Transient Analysis of Variable-Pitch Pump Turbines
Journal of Engineering for Power, 1967A method of analyzing the transient behavior of a pump turbine with variable-pitch blades is presented. A series of equations that describe the behavior of the unit during the transient period is found by interpolation of the unit’s characteristic. These equations are combined with the method of characteristic solution to the waterhammer equations to ...
openaire +1 more source
Loss Analysis for Pump-Turbine
The proceedings of the JSME annual meeting, 2000Takanori NAKAMURA +2 more
openaire +1 more source