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- Journal Article:
Gemaque et al.
The hydrokinetic turbine is used worldwide for electrical generation purposes, as such a technology may strongly reduce environmental impact. Turbines designed using backward swept blades can significantly reduce the axial load, being relevant for hydro turbines. However, few works have been conducted in the literature in this regard. For the case of hydrokinetic rotors, backward swept blades…
- Journal Article:
Moreira et al.
In this work, an AI-Driven (autonomous) model representation of the La Rance tidal barrage was developed using novel parametrisation and Deep Reinforcement Learning (DRL) techniques. Our model results were validated with experimental measurements, yielding the first Tidal Range Structure (TRS) model validated against a constructed tidal barrage and made available to academics. In…
- Journal Article:
Crooks et al.
This paper introduces a phase one computational design analysis study of a hydrokinetic horizontal parallel stream direct-drive (no gear box) counter-rotating Darrieus turbine system. This system consists of two Darrieus rotors that are arranged in parallel and horizontal to the water stream and operate in counter-rotation due to the incoming flow. One of the rotors directly drives an armature…
- Journal Article:
Awandu et al.
Energy accessibility, reliability and availability are key components of improved quality of life and human development in all spheres. As the United Nations’ SDG 7 calls for access to electricity for all by 2030, Africa still has a wide gap to fill as the statistics show that 85% of the population that will not have access to electricity is in Africa. As the world tries to wean itself off non…
- Journal Article:
Galvez et al.
The fabrication route for tidal turbine blades has been compounded with the appearance of additive manufacturing; with the use of infill patterns, improvement of mechanical strength and material reduction for 3D printed parts can be obtained. Through finite element analysis and three-point bend tests, the optimal infill lattice pattern, and the viability of the shell–infill turbine blade model…
- Journal Article:
Zhang et al.
Turbulence and waves interactions are present in tidal streams ensuing the poorly comprehended unsteady state. To clarify several aspects of the wave influence on the flow and turbine power output, the 1:60 scale rotor experiments (Froude similarity) are carried out: current only and with parallel waves. Compared to steady predictions, the mean power in current and with waves against a range…
- Journal Article:
Dorge and Bibeau
The following study investigates the effectiveness of a deep learning-based method for predicting the flow field and flow-driven rotation of a vertical-axis hydrokinetic turbine operating in previously unseen free-stream velocities. A Convolutional Neural Network (CNN) is trained and tested using the solutions of five two-dimensional (2-D), foil-resolved Unsteady Reynolds-Averaged Navier-…
- Journal Article:
Javidsharifi et al.
Daily increasing use of tidal power generation proves its outstanding features as a renewable source. Due to environmental concerns, tidal current energy which has no greenhouse emission attracted researchers’ attention in the last decade. Additionally, the significant potential of tidal technologies to economically benefit the utility in long-term periods is substantial. Tidal energy can be…
- Journal Article:
Gambuzza et al.
Tidal currents are renewable and predictable energy sources that could prove fundamental to decrease dependency from fossil fuels. Tidal currents, however, are highly unsteady and non uniform, resulting in undesirable load fluctuations on the blades and the drive train of turbines. A passive morphing blade concept capable to reduce the load fluctuations without affecting the mean loads has…
- Journal Article:
Hlophe et al.
In many offshore operations, including the operation of wave energy converters, phase-resolved wave prediction is essential for safety and efficiency. However, for sea-states with large directional spreading angles, wave prediction becomes increasingly difficult. This study investigates the benefit of exploiting concurrent surface-displacement time histories measured by a buoy in three degrees…
- Journal Article:
Fouz et al.
Hydrokinetic energy can contribute to diversify and decarbonise the energy mix in many coastal regions, in particular estuaries. These are typically areas of high environmental value and with intense socioeconomic activity. The aim of this work is to provide a comprehensive methodology for selecting the optimum locations for hydrokinetic energy exploitation, by considering all the relevant…
- Journal Article:
Dorella et al.
The effect of diffuser-enhanced flow on the energy extraction performance of hydrokinetic turbines is widely reported in the literature. In this context, this work combines automatic scripting for geometry construction and meshing, together with a simulation-based approach using particle-swarm optimization with Computational Fluid Dynamics (CFD) to design an augmented hydrokinetic river…
- Journal Article:
Reddy et al.
The energy crisis followed by severe environmental concerns has led mankind to develop renewable energy sources. Recently, the development of hydrokinetic technology is gaining research interest to tap the kinetic energy available in water flowing streams. Among all hydrokinetic turbine configurations, the lift-based vertical axis hydrokinetic turbine (VAHT) is found to be efficient at a high…
- Journal Article:
Chaudhari and Shah
Hydrokinetic energy has the least environmental impact and a high potential for small-scale energy production. Savonius hydrokinetic turbine extracts the hydrokinetic energy from the water current. It has a simple design and is inexpensive and quiet. The NACA6409 blades are implemented in place of conventional semi-circular blades of the Savonius hydrokinetic turbine and the newly Airfoil…
- Journal Article:
Badawy et al.
River current energy is regarded as one of the most environmentally friendly sources of electricity. Because it doesn't produce power by holding water in a reservoir and causing a height differential, a river current (or hydrokinetic) device is not a dam. Turbines placed inside rivers immediately harvest the kinetic energy of flowing water. Like Egypt's river Nile can be used to study this…
- Journal Article:
Bryden and Macfarlane
This paper is an investigation into how the coupling of tidal current turbines with energy storage mechanisms could result in an effective firm supply capacity. It is shown that the cyclic nature the tidal current resource ensures that even relatively small storage capacities could prove effective.
- Journal Article:
Wang et al.
Hydrokinetic power as a clean renewable energy has been aroused a widespread concern. Horizontal axis turbines are widely used in the field of tidal and river current energy power generation, but their internal flow loss characteristics have not been fully revealed. In this paper, a micro horizontal axis river ducted turbine is taken as the research object, and the flow loss characteristics of…
- Journal Article:
Low et al.
The current work highlights development of novel thin-film composite hollow fiber membranes for pressure retarded osmosis applications to harvest salinity gradient energy. The membranes were developed with a specific target of harnessing the salinity gradient energy between wastewater reverse osmosis retentate and seawater reverse osmosis brine via osmotic mixing. The hollow fiber…
- Journal Article:
Haddout and Priya
Salinity gradient energy (SGE) is the energy that can be obtained from the mixing entropy of two solutions with a different salt concentration. This energy could be used for electricity production by some methods (e.g. Reverse Electro-Dialysis (RED); Pressure Retarded Osmosis (PRO) … , etc.). Estuaries or Delta, as zones for mixing of fresh water from rivers and saltwater from the sea, has a…
- Journal Article:
Jung et al.
Cylindrical triboelectric nanogenerators (C-TENGs) have been designed for low frequency wave energy harvesting. However, the random, and low amplitude and frequency of the ocean waves represent a major challenge for the operation and performance of most C-TENGs. A C-TENG must be able to operate and be triggered by any wave conditions, even in the middle of the ocean, with uniform, low…
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