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Wave power

About: Wave power is a research topic. Over the lifetime, 2671 publications have been published within this topic receiving 41439 citations. The topic is also known as: wind wave energy & sea wave energy.


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Journal ArticleDOI
TL;DR: In this article, the performance of a newly developed direct drive hydro turbine (DDT), which will be built in a caisson for a wave power plant, was investigated, and the results showed that the DDT obtains fairly good turbine efficiency in cases with and without wave conditions.
Abstract: Clean and renewable energy technologies using ocean energy give us non-polluting alternatives to fossil-fueled power plants as a countermeasure against global warming and growing demand for electrical energy. Among the ocean energy resources, wave power takes a growing interest because of its enormous amount of potential energy in the world. Therefore, various types of wave power systems to capture the energy of ocean waves have been developed. However, a suitable turbine type is not yet normalized because of relatively low efficiency of the turbine systems. The purpose of this study is to investigate the performance of a newly developed direct drive hydro turbine (DDT), which will be built in a caisson for a wave power plant. Experiment and CFD analysis are conducted to clarify the turbine performance and internal flow characteristics. The results show that the DDT obtains fairly good turbine efficiency in cases with and without wave conditions. Most of the output power is generated at the runner passage of Stage 2. Relatively larger amount of the decreased tangential velocity at Stage 2 produces more angular momentum than that at Stage 1 and thus, the larger angular momentum at the Stage 2 makes a greater contribution to the generation of total output power in comparison with that at Stage 1. Large vortex existing in the upper-left region of the runner passage forms a large recirculation region in the runner passage, and the recirculating flow consumes the output power at Region 2.

16 citations

Journal ArticleDOI
TL;DR: In this paper, a numerical model is implemented to describe the wave climate of combined swell and wind waves in a deltaic estuary, and an extensive analysis on a valid effective wave power range that directly impacts the marsh edge is performed and presented.
Abstract: The extensive coastal wetlands in Mississippi River Delta represent the seventh largest deltaic floodplain in the world, contributing to many services that sustain the economies of the region. Subsidence, sea level rise, saltwater intrusion, wave action from storms, and sediment depletion have contributed to chronic wetland losses, converting vegetated lands into open waters and increasing wind fetch. Among these factors listed, wave energy plays the largest role in marsh edge erosion in an open bay environment. Degrading barrier islands along the shoreline of this delta allow swell energy to enter protected bay areas, contributing to marsh edge erosion. Locally generated wind waves within enlarged bays also contribute to wetland loss. Quantifying the roles of swell and wind waves in marsh edge erosion is essential to any ecosystem restoration design. In this study, a numerical model is implemented to describe the wave climate of combined swell and wind waves in a deltaic estuary. Terrebonne Bay was chosen as the study area because it has experienced one of the largest reductions in barrier islands and wetland loss rates among Louisiana estuaries. A continuous wave measurement in upper Terrebonne Bay was obtained over the course of a year. A spectral wave model is used to hindcast the wave climate in the estuary. The model results are compared against the in situ wave measurement. The wave power is partitioned into swell and wind sea at different locations in Terrebonne Bay using the model results. An extensive analysis on a valid effective wave power range that directly impacts the marsh edge is performed and presented. Insight into the temporal and spatial variability of wave power is gained. Through differentiating swell and wind sea energies around the bay, improvements of long-term wave power computation for shoreline retreat prediction are made. It is found that the swell energy becomes the primary driver of marsh edge retreat in the southwest part of Terrebonne Bay as the barrier islands are degrading.

16 citations

Patent
27 Aug 2007
TL;DR: The wave surge power converter (WPC) as discussed by the authors is a wave power converter employing independently staged surge energy capture for converting useful wave surge energy to electric power over a relatively broad range of surf conditions.
Abstract: A wave power converter employing independently staged surge energy capture for converting useful wave surge energy to electric power over a relatively broad range of surf conditions. The wave surge power converter includes an inclined ramp with several openings for receiving wave water into several independent chambers for capturing and retaining surge water in hydraulic isolation, a check valve in each chamber permitting water to flow into a conduit and a generator for producing electrical power from water flow in the conduit. The apparatus is suitable for low-cost manufacture, offers simple robust operation suitable for underdeveloped regions of the world, may be fabricated from commonly-available components, requires few moving parts and no valuable (lootable) components other than a generator, and is self-flushing for low maintenance operation.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the authors considered the radiation of water waves by a submerged, horizontal circular cylinder in a channel, where the cylinder axis is perpendicular to the channel walls and the length of the cylinder is less than the width of the channel.

16 citations

Journal ArticleDOI
TL;DR: In this article, an explicit theory without any empirical parameter is derived on the response of the air chamber of an O.W.C, type wave power extractor to incident waves, and experiments with regular waves verifies this theory.
Abstract: An explicit theory without any empirical parameter is derived on the response of the air chamber of an O.W.C, type wave power extractor to incident waves. Experiments with regular waves verifies th...

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202349
2022117
2021111
2020142
2019137
2018138