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- Journal Article:
Zhu et al.
The vertical axis marine current turbine is emerging as a promising candidate for renewable energy applications, while its wide application is currently limited by low and unsteady power output. In this paper, the influence of helical triangle blade on the performance of vertical axis marine current turbine has been investigated. Four types of helical triangle blades with helical wrap angle of…
- Journal Article:
Nag and Sarkar
The Helical Savonius hydrokinetic turbines (HSHKT) are regarded as the beneficiary equipment to increase the power generation in low head rivers. This study investigates the performance of HSHKT arranged in arrays. Firstly, performance analyses of two HSHKT rotors are experimentally performed, arranged in inline formation along the fluid flow direction, for different spacing between them (L).…
- Journal Article:
Fajri et al.
The predictive capabilities of blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and detached eddy simulation (DES), the most commonly used hybrid RANS/large eddy simulation (LES) model, are assessed for hydrokinetic turbine performance and mean and turbulent flows in the intermediate-wake region, and results for a range of tip-speed ratio encompassing design and off-design…
- Journal Article:
Mayon et al.
The Oscillating Water Column (OWC) is one of the most popular Wave Energy Convertor (WEC) technologies, but the energy conversion efficiency is still very low and is a bottleneck to limit its application and commercialization. A novel OWC system comprising of a cylindrical OWC WEC and a parabolic wave reflector was proposed and a revolutionary breakthrough in the hydrodynamic efficiency was…
- Journal Article:
Judge et al.
This research presents a methodology for carrying out uncertainty analysis on measurements made during wave basin testing of an oscillating water column wave energy converter. Values are determined for type A and type B uncertainty for each parameter of interest, and uncertainty is propagated using the Monte Carlo method to obtain an overall expanded uncertainty with a 95% confidence level…
- Journal Article:
Brodersen et al.
Ocean waves provide a clean, reliable source of energy making them a viable energy source for desalination, especially in coastal communities and island nations. However, large capital costs render current wave-powered desalination technologies economically infeasible. This work presents a configuration for ocean-wave-energy-powered batch reverse osmosis. The proposed system uses seawater as…
- Journal Article:
Ren et al.
It is of great significance to find high-efficiency microwave absorbing materials with corrosion resistance to improve the environmental adaptability and survivability of military targets in harsh chemical environment. Corrosion will lead to the degradation of its microwave absorption performance, and hinder its further application in the actual environment. Herein, a new strategy of chiral…
- Journal Article:
Coles et al.
This review provides a critical, multi-faceted assessment of the practical contribution tidal stream energy can make to the UK and British Channel Islands future energy mix. Evidence is presented that broadly supports the latest national-scale practical resource estimate, of 34 TWh/year, equivalent to 11% of the UK’s current annual electricity demand. The size of the practical resource depends…
- Journal Article:
Abdelkader and Sharqawy
Salinity gradient energy (SGE) is a source of renewable energy which utilizes the osmotic pressure difference between two water streams of different salinities. The present paper investigates the effect of environmental water temperature variations on the performance of the pressure retarded osmosis (PRO) process employed to harvest SGE. Using experimental and numerical approaches, the effect…
- Journal Article:
Kim et al.
Ocean Thermal Energy Conversion (OTEC) relies on the thermal differences between ocean surface waters and cooler waters at c. 1000 m depth. The highest and most reliable thermal differentials are in the low latitudes, 20° either side of the equator, including the Pacific Islands region. Whilst in theory OTEC can utilize an inexhaustible amount of stored energy within the oceans, in practice…
- Journal Article:
Guo and Ringwood
Although wave energy prototypes have been proposed for more than 100 years, they have still not reached full commercialisation. The reasons for this are varied, but include the diversity of device operating principles, the variety of onshore/nearshore/offshore deployment possibilities, the diversity of the wave climate at various potential wave energy sites, and the consequent lack of…
- Journal Article:
Anand et al.
A Crossflow turbine is a device used to generate power from hydro, which is a renewable source of energy. The salient feature of this turbine is its simplicity in construction. In the past few decades, variables such as flow diverter, air holes, bidirectional flow were introduced in the turbine design to improve its efficiency. This paper presents a comprehensive review of the performance of…
- Journal Article:
Zhao and Dong
The objective of this study is to investigate the effect of statistical models for constructing the bivariate distribution of metocean data on design loads and reliability assessment of offshore structures. First, the conventional conditional joint distribution and single copula models are utilized for characterizing the statistical data. Additionally, a novel mixed copula model is developed…
- Journal Article:
Mujeeb-Ahmed et al.
An offshore mooring system stations a ship-shaped offshore installation in place while withstanding incoming loads from the marine environment with short-term and long-term uncertainties. This study aims to develop a novel framework for analysing the loads on floating systems, namely mooring line tension, mooring line fatigue damage, and hull bending moment, as a function of the mooring layout…
- Journal Article:
Wilson et al.
Shared mooring systems, where adjacent platforms are tethered directly to each other, can reduce anchor quantities and mooring line lengths in a floating array but also introduce new modeling and design challenges. This paper presents and demonstrates a first-order approach to modeling and designing shared mooring systems that simplifies these challenges. We formulate a general, linearized…
- Journal Article:
Li and Choung
The synthetic fiber rope is a mooring material that is increasingly used, but few commercial codes are known to reliably implement the nonlinear stiffnesses of this material. Through the development of a floating platform-mooring line coupled simulation code that allows simultaneous consideration of the strain- and strain rate-dependent nonlinear stiffness, this paper aims to examine the…
- Journal Article:
Wang et al.
During the previous OC5 project, state-of-the-art mid-fidelity engineering tools for floating wind systems were found to consistently underpredict the nonlinear, low-frequency responses of semisubmersible offshore wind platforms, leading to substantial errors in the structural loads because of low-frequency surge and pitch resonance. To examine this underprediction, a coordinated investigation…
- Journal Article:
Wang
The power performances of a point absorber wave energy converter (WEC) operating in a nonlinear multidirectional random sea are rigorously investigated. The absorbed power of the WEC Power-Take-Off system has been predicted by incorporating a second order random wave model into a nonlinear dynamic filter. This is a new approach, and, as the …
- Journal Article:
Wang
This paper concerns the prediction of the power output performances of an oscillating surge wave energy converter in irregular waves. The generated power has been calculated using a new methodology by incorporating a stochastic Lagrange wave model into a non-linear filter which takes also hydrodynamic forces into account. It is shown that the stochastic Lagrange wave model in this paper can be…
- Journal Article:
Stock et al.
Wave energy converters (WECs) come in many different forms, from point absorbers and oscillating water columns to bulge wave devices. This paper focuses on the control of point absorber WECs, which typically have a narrow-banded frequency response and, therefore, control is well placed to improve the energy capture of such WECs. The acausal nature of the control problem means that,…
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