Numerical analysis of counter-rotating impulse turbine for wave energy
Numerical analysis of counter-rotating impulse turbine for wave energy conversion By T. Ogawa, M. Takao, S. Okuhara, S. Sasaki, M.M. Ashraful Alam, Y. Kinoue Book Trends in Renewable Energies Offshore
Flywheel Energy Storage Explained
Flywheel Energy Storage Systems (FESS) work by storing energy in the form of kinetic energy within a rotating mass, known as a flywheel. Here''s the working principle explained in simple way, Energy Storage: The system features a flywheel made from a carbon fiber composite, which is both durable and capable of storing a lot of energy.
PAPER OPEN ACCESS A study of counter-rotating impulse
In such wave energy devices, a water column which oscillates due to the sea wave motion is used to drive an air column as shown in Figure 1. An air turbine is used to convert the pneumatic energy of this bi-directional airflow into the mechanical energy [1]. The counter-rotating impulse turbine for wave energy conversion has been proposed by M. E.
Computation method and control strategy of rotating ...
Rotating separation flow (RSF) in hydraulic machinery is characterized by the large flow separations and complex vortical structures induced by the effects of strong rotation, large curvature and multiple wall surfaces, and conducting efficient engineering computation and putting forward effective control strategy for the RSF are important topics in the inner flow …
Low-head pumped hydro storage: A review of applicable …
In a global effort to reduce greenhouse gas emissions, renewables are now the second biggest contributor to the world-wide electricity mix, claiming a total share of 29% in 2020 [1].Although hydropower takes the largest share within that mix of renewables, solar photovoltaics and wind generation experience steep average annual growth rates of 36.5% and 23%, …
Low head pumped hydro storage with contra-rotating pump …
The increasing share of electrical energy production by intermittent sources pushes the demand for energy storage. Pumped hydro storage (PHS) has a long history of providing a cost …
Axial-Flux Permanent-Magnet Dual-Rotor Generator for a …
The process of converting the kinetic energy of wind into mechanical energy of rotational motion of rotating masses using a single-rotor wind turbine in accordance with the Betz''s law [1] is ...
Engineering & Performance of DuoTurbo: Microturbine with Counter …
A counter-rotating microturbine forms the core element of the energy recovery system. The modular in-line technology is supposed to require low capital expenditure, targeting profitability within ...
DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy ...
A counter-rotating microturbine forms the core element of the energy recovery system. The modular in-line technology is supposed to require low capital expenditure, targeting profitability within ...
Frontiers | Hydraulic Optimization of Two-Way Counter-rotating …
In this paper, the hydraulic design of the two-way counter-rotating axial-flow pump turbine of the tidal power station is designed. Two common counter-rotating unit structures are designed for the tidal power station, and the influence of the gap between the impeller …
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The nal machine should have a scalable design with capacity ranges from 300kW up to 10MW depending on location. The aim is to have the peak e ciency at a head of 10m, but heads down to 2m are considered. Three pump-turbine concepts are to be investigated, a counter-rotating hub-driven, a counter-rotating
Simulation of energy recovery on water utility networks by a …
A counter-rotating microturbine forms the core element of the energy recovery system. The modular in-line technology is supposed to require low capital expenditure, targeting profitability within ...
US20210355839A1
Apparatuses, systems and methods are disclosed for storing electrical energy as thermal energy and retrieving electrical energy from the stored thermal energy on a large utility scale....
Operation of the counter-rotating type pump-turbine unit …
The pumped storage is equipped with a counter-rotating type pump-turbine unit whose operating mode can be shifted instantaneously in response to the fluctuation of power …
Experimental Analysis of a Novel Adaptively Counter …
Considering the working environment and energy demands of drifters, this paper proposes a counter-rotating self-adaptable wave energy converter (WEC) for powering drifters. The wave energy-powered SVP drifter …
Design technique to improve the energy efficiency of a counter-rotating ...
DOI: 10.1016/J.RENENE.2016.09.026 Corpus ID: 115027108; Design technique to improve the energy efficiency of a counter-rotating type pump-turbine @article{Kim2017DesignTT, title={Design technique to improve the energy efficiency of a counter-rotating type pump-turbine}, author={Joonhyoung Kim and Bo-Min Cho and Sung Kim and Jin-Woo Kim and Jun-Won Suh …
Hydraulic Optimization of Two-Way Counter-rotating Axial
2010; Cao et al., 2012). Counter-rotating axial flow turbines have been widely used in various industrial fields such as propellers, axial flow pumps and low-speed fans (Shinpei et al., 2010;
Optimized Blade Design of Counter-Rotating-Type Pump …
InternationalJournalofRotatingMachinery (Ra ) Fron peller (Fron ) Rar peller 23 42 40 23 151 15.4 45 155 60 Counter-otatin um-urb t F ection Pping de
Brayton Energy | arpa-e.energy.gov
The Brayton Energy team will develop a key component to enable a cost-competitive Laughlin-Brayton battery energy storage system that combines thermal storage and innovative turbomachinery to generate power. When the system is charging, an electrically driven heat pump will accumulate thermal energy in a high temperature thermal energy storage …
Zhongyue Lu''s research works | National University of Defense ...
Zhongyue Lu''s 22 research works with 51 citations and 3,751 reads, including: Improving the power capture performance of deep-sea two-body counter-rotating wave energy using frequency domain ...
Design and Numerical Analysis of a Novel Counter-Rotating Self ...
In this paper, a novel wave energy converter (WEC) for power supply of low-power unmanned ocean detectors is proposed, which is a small-scale counter-rotating self-adaptive point absorber-type WEC.
Reversing Turbomachine for Thermally-Pumped Electrical …
Brayton cycle energy storage Project Vision. 4 Cold Brg Hot 1 2 Motor-Gen. Brg QH,GEN QC,GEN Cold Sto. Cold Sto. Hot Salt Hot Salt 3 5 2 6 6 Q REJ ... design of reversible counter-rotating turbomachinery. Sensitivity to hot ... "Baseline" Twin Machine • Aero reviewed by four prominent teams: Final Detailed Design • PCA
Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating ...
This paper presents a coaxial counter-rotating planetary transmission system. The transmission system under study is a two-stage planetary gear train (PGT) comprising a fixed-axes PGT and a differential PGT. A dynamic model of the transmission system is established, considering both the excitations caused by the time-varying mesh stiffness (TMS) …
Rotating, Self-Excited, Asymmetric Radio Frequency Resonant Ca...
1. A rotating machine adapted to be propelled by the net force created from a rotating shaft assembly comprising: a asymmetric electromagnetic microwave or radio frequency resonant cavity thruster which is powered by a adapted electromagnetic microwave or radio frequency generator geometrically designed for inputting an optimized electromagnetic signal …
Low-head pumped hydro storage: A review of applicable …
Among conventional machines, it is found that, for high-flow low-head application, axial flow pump-turbines with variable speed drives are the most suitable. Machines such as …
Mechanical Counters
Send the real-time position of machine parts moving along spindles, lead screws, and threaded shafts to your computer or programmable logic controller (PLC). These indicators help you make faster, more precise adjustments than you can with standard position indicators.
Optimized Blade Design of Counter-Rotating-Type Pump …
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 shear stress turbulence model. The hub and tip blade angles of the rear impeller (in the pump mode) were …
Analysis of the Dynamic Characteristics of Coaxial …
This paper presents a coaxial counter-rotating planetary transmission system. The transmission system under study is a two-stage planetary gear train (PGT) comprising a fixed-axes PGT and a differential …
Reversible Counter-Rotating Turbomachine to Enable Brayton …
–Consolidation into one machine can be achieved via a full set of interstage variable position stators, or with the simpler counter-rotating turbomachine; either design represents a major …
Operation of the counter-rotating type pump-turbine unit …
The pumped storage is equipped with a counter-rotating type pump-turbine unit whose operating mode can be shifted instantaneously in response to the fluctuation of power from renewable resources. This paper verifies that the system is reasonably effective to stabilize the fluctuating power.
Reversing Turbomachine for Thermally-Pumped Electrical …
• Counter-rotating axial compressor and turbine. • Elimination of conventional stators and associated losses. • Optimized blade shapes to minimize compromises associated with …
Axial-Flux Permanent-Magnet Dual-Rotor …
Coaxial counter-rotating propellers have been widely applied in ships and helicopters for improving the propulsion efficiency and offsetting system reactive torques. Lately, the counter-rotating concept has been introduced into …
DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy ...
To enhance the sustainability of water supply systems, the development of new technologies for micro scale hydropower remains an active field of research. The present paper deals with the implementation of a new micro-hydroelectric system for drinking water facilities, targeting a gross capacity between 5 kW and 25 kW. A counter-rotating microturbine forms the …
Rotor Design for High-Speed Flywheel Energy Storage Systems
wheels and spinning wheels are early examples of systems employing kinetic energy storage in a rotating mass. With the advent of modern machinery, flywheels became commonplace as
The investigation of a coaxial twin-counter-rotating turbine with ...
The alternating current from the generator will be fed into the energy management module''s energy control panel for rectification, voltage rise and fall, and storage in the energy storage module. Fig. 1 depicts the composition of the prototype. Download : Download high-res image (283KB) Download : Download full-size image; Fig. 1.
Flywheel energy storage—An upswing technology for energy …
Flywheel energy storage (FES) can have energy fed in the rotational mass of a flywheel, store it as kinetic energy, and release out upon demand. ... presents a system consisting of a double counter rotating flywheel unit serving for the satellite energy ... coupling a hydraulic system with a flywheel is used in lift equipment for potential ...
Experimental Analysis of a Novel Adaptively Counter …
An energy storage system has been demonstrated ... modeling, and experimental equipment in 2004. The overtopping device works ... counter-rotating self-adaptable wave energy converter (WEC) for ...
Design technique to improve the energy efficiency of a counter-rotating ...
Request PDF | On Feb 1, 2017, Joon-Hyung Kim and others published Design technique to improve the energy efficiency of a counter-rotating type pump-turbine | Find, read and cite all the research ...
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Frequently Asked Questions
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What is photovoltaic energy storage?
Photovoltaic energy storage is the process of storing solar energy generated by photovoltaic panels for later use.
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How does photovoltaic energy storage work?
It works by converting sunlight into electricity, which is then stored in batteries for use when the sun is not shining.
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What are the benefits of photovoltaic energy storage?
Benefits include energy independence, cost savings, and reduced carbon footprint.
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What types of batteries are used in photovoltaic energy storage?
Common types include lithium-ion, lead-acid, and flow batteries.
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How long do photovoltaic energy storage systems last?
They typically last between 10 to 15 years, depending on usage and maintenance.
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Can photovoltaic energy storage be used for backup power?
Yes, it can provide backup power during outages or emergencies.