In order to study pressure fluctuation characteristics of a centrifugal pump as turbine (PAT) in its start-up process, Fluent was used do numerical simulation the PAT process. Time and frequency domain analyses were performed on data acquired at different positions heads. The results show that large number low-pressure areas strong vortexes are formed within impeller initial time start-up. With...

Transient processes that occur in pumped storage power plants can cause high-pressure conditions, which turn result vibrations the pump–turbine structure and even damage to structural components. It is therefore crucial research transient process of large units flow-induced The three-dimensional flow field models a high-head prototype were constructed study its characteristics under turbine sta...

Abstract. A multi-body dynamical model of a wind turbine power generation system (WTPGS) based on hydromechanical hybrid transmission (HMHPT) technology is developed and simulated to overcome the individual drawbacks gear train hydrostatic (HPT) system. The HMHPT concept single-stage planetary (SSPGT) typical HPT. input shaft SSPGT coupled with rotor, whereas output hydraulic pump. pump supplie...

In contrast to conventional generators, self-excited induction generators are found to be most suitable machines for wind energy conversion in remote and windy areas due to many advantages over grid connected machines. This papers presents a Self-Excited Induction Generator (SEIG) driven by wind turbine and supplying an induction motor which is coupled to a centrifugal pump. A method to describ...

Since the pump as turbine is increasingly employed in energy storage, improving efficiency both and modes required for economic benefits. This study aims to analyze vortex flow characteristics control methods reduce hydraulic loss. In this paper, a delayed detached eddy simulation was applied low specific speed pump-turbine. Based on entropy production analysis vorticity binary decomposition lo...

Water distribution networks face several problems related to leakages, where the pressure control strategy is a common practice for water loss management. Small-scale hydropower schemes, where pumps as turbines replace pressure reducing valves, can be considered an interesting technical solution, which ensures both economic convenience and system flexibility. Due to the water networks’ variable...