A Conceptual Overtopping Wave Energy Convertor Suitable for Small Waves

2010 ◽  
Author(s):  
John T. Imamura ◽  
Alaa Mansour
Keyword(s):  
Wave Energy ◽  
Water Waves ◽  
Energy Resource ◽  
High Energy ◽  
Wave Activity ◽  
Design Concept ◽  
Ocean Water ◽  
Large Wave ◽  
Energy Devices ◽  
Ocean Wave Energy

This paper proposes a design concept in the area of overtopping ocean wave energy devices. Current models of overtopping devices are limited to locations which experience large wave activity. The high energy associated with large waves enables the ocean water waves to overtop the device ramp into the collection reservoir which discharges through a power generating turbine. The ramp height is necessarily large to establish a sufficient collection reservoir head. The proposed design concept can utilize small waves by implementing a gearing system which can transfer water to the collection reservoir. This allows for greater access to the wave energy resource at more locations than currently possible. A simplified model of this design concept is presented and applied to varying wave conditions off the coast of California.

scholarly journals A Wave Energy Extraction System in Experimental Flume

2016 ◽  
Vol 2016 ◽  
pp. 1-4
Author(s):  
Qin Guodong ◽  
Pang Quanru ◽  
Chen Zhongxian
Keyword(s):  
Wave Energy ◽  
Ocean Waves ◽  
High Energy ◽  
Ocean Wave ◽  
High Energy Density ◽  
Extraction System ◽  
Energy Extraction ◽  
Linear Generator ◽  
Ocean Wave Energy ◽  
Experimental Flume

Ocean wave energy is a high energy density and renewable resource. High power conversion rate is an advantage of linear generators to be the competitive candidates for ocean wave energy extraction system. In this paper, the feasibility of a wave energy extraction system by linear generator has been verified in an experimental flume. Besides, the analytical equations of heaving buoy oscillating in vertical direction are proposed, and the analytical equations are proved conveniently. What is more, the active power output of linear generator of wave energy extraction system in experimental flume is presented. The theoretical analysis and experimental results play a significant role for future wave energy extraction system progress in real ocean waves.

scholarly journals Hydrodynamic Analysis of Surge-Type Wave Energy Devices in Variable Bathymetry by Means of BEM

Fluids ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 99 ◽  
Author(s):  
Alexandros Magkouris ◽  
Markos Bonovas ◽  
Kostas Belibassakis
Keyword(s):  
Wave Energy ◽  
Water Waves ◽  
Energy Converter ◽  
Energy Potential ◽  
Hydrodynamic Analysis ◽  
Energy Devices ◽  
Type Wave ◽  
Point Absorbers ◽  
Incident Waves

A variety of devices and concepts have been proposed and thoroughly investigated for the exploitation of renewable wave energy. Many of the devices operate in nearshore and coastal regions, and thus, variable bathymetry could have significant effects on their performance. In particular, Oscillating Wave Surge Converters (OWSCs) exploit the horizontal motion of water waves interacting with the flap of the device. In this work, a Boundary Element Method (BEM) is developed, and applied to the investigation of variable bathymetry effects on the performance of a simplified 2D model of a surge-type wave energy converter excited by harmonic incident waves. Numerical results, illustrating the effects of depth variation in conjunction with other parameters, like inertia and power-take-off, on the performance of the device, are presented. Finally, a comparative evaluation of the present simplified surge-type WEC model and point absorbers is presented for a case study in a selected coastal site on the Greek nearshore area, characterized by relatively increased wave energy potential.

Assessment of ocean wave energy resource potential in Thailand

2018 ◽  
Vol 160 ◽  
pp. 64-74 ◽  
Author(s):  
Wongnarin Kompor ◽  
Chaiwat Ekkawatpanit ◽  
Duangrudee Kositgittiwong
Keyword(s):  
Wave Energy ◽  
Energy Resource ◽  
Ocean Wave ◽  
Resource Potential ◽  
Ocean Wave Energy

A Flexible Seafloor Carpet for High-Performance Wave Energy Extraction

2012 ◽  
Author(s):  
Mohammad-Reza Alam
Keyword(s):  
Wave Energy ◽  
High Performance ◽  
High Efficiency ◽  
Storm Surges ◽  
Energy Extraction ◽  
Energy Devices ◽  
Ocean Wave Energy ◽  
Ocean Renewable Energy ◽  
High Fraction ◽  
Extraction Scheme

Similar to the mechanism by which a visco-elastic mud damps the energy of overpassing surface waves, if the near-shore seafloor is carpeted by an elastic thin material attached to generators (i.e. dampers) a high fraction of surface wave energy can be absorbed. Here we present analytical modeling of the flexible carpet wave energy converter and show that a high efficiency is achievable. Expressions for optimal damping and stiffness coefficients are derived and different modes of oscillations are discussed. The presented wave energy conversion scheme is completely under the water surface hence imposes minimal danger to boats and the sea life (i.e. no mammal entanglement). The carpet is survivable against high momentum of storm surges and in fact can perform well under very energetic (e.g. stormy) sea conditions, when most existing wave energy devices are needed to shelter themselves by going into an idle mode. I am honored to be a colleague of Prof. Ronald Yeung at the University of California, Berkeley. He is a world renowned scientist of ship hydrodynamics with several valuable and key contributions to the field. This manuscript on a new ocean wave energy extraction scheme is due to Ron’s recent interest in the field of ocean renewable energy. I am looking forward to years of working closely with him. Thank you Ron.

scholarly journals Wave energy resource assessment at southern coast of the Gulf of Mexico

DYNA ◽  
2015 ◽  
Vol 82 (193) ◽  
pp. 49-55
Author(s):  
Alejandro Gonzalez-Carrillo ◽  
Raziel Ruiz-Cabrera ◽  
Quetzalcoatl Cruz Hernandez-Escobedo ◽  
Aranzazú Fernández-García ◽  
Francisco Manzano-Agugliaro
Keyword(s):  
Gulf Of Mexico ◽  
Wave Energy ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Density Wave ◽  
Energy Resource ◽  
High Energy ◽  
High Energy Density ◽  
Energy Sources ◽  
Southern Coast

Find alternative energy sources is one of the challenges that came with XXI century and this paper makes an analysis about wave energy, which presents several advantages over fossil based energy and even other renewable energy sources. Among them are its low environmental impact and its high energy density. Wave energy is beginning to be considered as an important and promising renewable resource in many countries. The objective of this paper is to evaluate the wave energy potential at the southern coast of the Gulf of Mexico; the sea states were observed and was obtained that the available mean wave power is 55.91 W/m. In addition, this paper shows that, in the study site, the most energetic season is fall and the less energetic season is spring. This differs from the global trend, were the most energetic season is winter, and the less energetic season is spring.

Ocean Wave Energy Conversion Devices Popular Today

1985 ◽  
Vol 9 (2) ◽  
pp. 105-113
Author(s):  
K.C. Watts ◽  
J.W. Graham
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Spectral Response ◽  
Oscillating Water Column ◽  
Energy Devices ◽  
Floating Raft ◽  
Ocean Wave Energy ◽  
The United Kingdom ◽  
Oil Crisis ◽  
Energy Conversion Devices

Wave energy is one source of alternate energy that has fascinated man’s imagination throughout history yet has alluded his ability to tap it economically for domestic use. Considerable interest in harnessing wave energy exists today in a number of parts of the world, prompted to a large extent by the oil crisis of 1973. This paper examines several wave energy devices which are currently being investigated in the United Kingdom, Japan, Norway and the U.S.A. Each is briefly examined in respect to its operating principles, efficiency, advantages, weaknesses and state of development. The devices discussed are: (1) the Kaimei, the floating ship off the coast of Japan; (2) Salter’s nodding duck with its gyroscopic reference frame; (3) the Lancaster flexible bag; (4) the SEA CLAM version of a flexible bag; (5) the NEL oscillating water column fixed rigidly to the ground; (6) the Vickers terminator and attenuator versions of the oscillating water column; (7) the Norwegian use of a “harbour” with an oscillating water column used to increase the device’s range of frequency response; (8) the latching buoy of Norway; and (9) the Bristol cylinder. Also presented are the studies at the Technical University of Nova Scotia of a two hinged floating raft, the DAM ATOLL of U.S.A. origin and a version of an oscillating water column device designed to increase its spectral response.

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