The Wave Energy Converter Based on Helmholtz Mode, Inspired by Nature

2013 ◽  
Author(s):  
Yalda Saadat ◽  
Nelson Fernandez ◽  
Reza Ghorbani
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Water Channel ◽  
Ocean Waves ◽  
Resonance Phenomenon ◽  
Wave Energy Conversion ◽  
Wave Tank ◽  
Helmholtz Resonance ◽  
Wave Amplification ◽  
Pulsating Current

The present study examines a new concept of wave energy conversion inspired by geological tidal-bowls (i.e. toilet bowls) and blowholes in nature, capitalizing on the Helmholtz resonance phenomenon. Tidal-bowls are of interest because they concentrate ocean wave energy in a basin while in resonance with incoming waves. Tidal-bowls are formed as sea channels grow landwards into a water basin, which can result in a high pulsating current of water inside the channel in and out of the basin. The resonance of water inside the basin produced by asymmetry of its narrow water channel allows for the capture of Helmholtz mode, which is the most energetic mode of the ocean waves. Thus, the objective of this project is to experimentally investigate the geometry of tidal-bowls in a wave tank including the size of the basin and the channel in order to obtain Helmholtz resonance. The model in the wave tank is scaled using the Froude number. Preliminary experiments were carried out measuring the water surface, demonstrating a strong correlation of the model to the theoretical Helmholtz mode’s model, σH2 = gHB/A0L. Where a basin with maximum water depth, H, and horizontal area, A0, is connected to the sea by a narrow strait of width, B, and the strait length, L. The proposed geometry can be used to harvest wave energy through either pulsating current of the channel using a water-turbine or using an air-turbine on the top of the basin. This study aims to catalyze future works in effective applications of this model towards wave energy conversion device development. Thus, we investigated the effects of the device’s length, and the device’s winglet’s angle at the inlet of the channel on wave amplification inside the basin. In addition, we experimentally demonstrated that the flow dampening inside the channel has no effect on basin’s resonance frequency.

scholarly journals Modelling Ocean Waves and an Investigation of Ocean Wave Spectra for the Wave-to-Wire Model of Energy Harvesting

2021 ◽  
Vol 12 (1) ◽  
pp. 51
Author(s):  
Safdar Rasool ◽  
Kashem M. Muttaqi ◽  
Danny Sutanto
Keyword(s):  
Time Series ◽  
Energy Harvesting ◽  
Energy Conversion ◽  
Wave Energy ◽  
Ocean Waves ◽  
Ocean Wave ◽  
Wave Spectra ◽  
Wave Energy Conversion ◽  
Peak Period ◽  
Ocean Wave Energy

Ocean wave energy is an abundant and clean source of energy; however, its potential is largely untapped. Although the concept of energy harvesting from ocean waves is antiquated, the advances in wave energy conversion technologies are embryonic. In many major studies related to wave-to-wire technologies, ocean waves are considered to be regular waves with a fixed amplitude and frequency. However, the actual ocean waves are the sum of multiple frequencies that exhibit a particular sea state with a significant wave height and peak period. Therefore, in this paper, detailed modelling of the ocean waves is presented and different wave spectra are analyzed. The wave spectra will eventually be used for the generation of wave elevation time series. Those time series can be used for the wave-to-wire model-based studies for improved investigations into wave energy conversion mechanisms, mimicking the real ocean conditions.

scholarly journals WAVE ENERGY CONVERSION AN EMERGING MODE OF RENEWABLE AND SUSTAINABLE POWER GENERATION

2013 ◽  
pp. 78-84
Author(s):  
DIGVIJAY SINGH RAGHUVANSHI ◽  
JAYESH L. MINASE
Keyword(s):  
Power Generation ◽  
Energy Conversion ◽  
Wave Energy ◽  
Ocean Waves ◽  
Future Research ◽  
Extensive Literature ◽  
Wave Energy Conversion ◽  
Power Requirement ◽  
Wave Energy Converters ◽  
Set Up

Ocean waves, if employed efficiently for generation of electricity, could result in the most economic green process (minimal carbon emission). This paper, based on the extensive literature survey conducted as a part of a B.Tech Project provides an overview of the current scenario of power generation and consumption in India thereby emphasizing on the progressively increasing power requirement and a lagging behind share of renewable energy. A scientific clarity is drawn on the basic theory behind wave generation and the key factors for assessing and deploying wave energy converters. Further, a few successful wave energy conversion techniques are discussed briefly, which posses the potential scope of future research and development and are presently employed under pre-commercial and commercial stages around the globe. A special emphasis is laid on the point absorber section which has been the area of research for the authors‘ project thereby detailing its constructional and working aspects and also discussing briefly an experimental procedure to set up a wave generator, to calculate mechanical conversion efficiency, and its scope of applicability. The conclusion is drawn in favor of the coastal communities which still rely on costly diesel for generating electricity.

scholarly journals Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4510 ◽  
Author(s):  
Mohd Afifi Jusoh ◽  
Mohd Zamri Ibrahim ◽  
Muhamad Zalani Daud ◽  
Aliashim Albani ◽  
Zulkifli Mohd Yusop
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Ocean Waves ◽  
Ocean Wave ◽  
Control Mechanisms ◽  
Wave Energy Conversion ◽  
Hydraulic Power ◽  
Ocean Wave Energy ◽  
System A ◽  
Energy Conversion Systems

Ocean wave energy is one of the most abundant energy sources in the world. There is a wide variety of wave energy conversion systems that have been designed and developed, resulting from the different ways of ocean wave energy absorption and also depending on the location characteristics. This paper reviews and analyses the concepts of hydraulic power take-off (PTO) system used in various types of wave energy conversion systems so that it can be a useful reference to researchers, engineers and inventors. This paper also reviews the control mechanisms of the hydraulic PTO system in order to optimise the energy harvested from the ocean waves. Finally, the benefits and challenges of the hydraulic PTO system are discussed in this paper.

scholarly journals IMPLEMENTATION AND TESTING OF A POWER MATRIX-BASED WAVE ENERGY CONVERSION MODEL AND THE EFFECT SIMULATED ON THE WAVE FIELD — CASE STUDY OF LAGUNA, SC, BRAZIL

2019 ◽  
Vol 18 (1) ◽  
pp. 50
Author(s):  
P. H. Oleinik ◽  
W. C. Marques
Keyword(s):  
Energy Conversion ◽  
Wave Height ◽  
Wave Energy ◽  
Significant Wave Height ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Ocean Waves ◽  
Wave Energy Conversion ◽  
Significant Wave ◽  
Order Of Magnitude

Electrical energy has become an essential resource for mankind and, as the population and technological dependency grow, also does the electricity demand. This necessity boosted numerous studies which focus on clean and renewable energy sources. Ocean wave energy is one of the most environmentally friendly sources of energy since it does not emit pollutants to the atmosphere and does not produce harmful waste. Another positive point about ocean waves is that they are inexhaustible, therefore a power plant could, potentially, provide energy indefinitely. Hence the object of this study is to estimate the wave energy reduction caused by the presence of wave energy conversion (WEC) devices near the coastline of Laguna, Brazil. In order to study the coastal impact of a WEC farm, the third generation sea state model TOMAWAC was used to simulate the waves on the Southern Brazilian Shelf under two different conditions, with and without the presence of an array of WECs. The results show that the mean significant wave height in the blockaded area undergoes a slight drop, caused by the presence of the WECs, which do not appear in the other scenario. But this reduction of the significant wave height is negligible compared to the order of magnitude of the wave height itself.

Wave Energy Conversion for Shoreline Protection

2013 ◽  
Vol 47 (4) ◽  
pp. 187-192 ◽  
Author(s):  
Michael E. McCormick ◽  
Robert C. Murtha ◽  
Jeffrey Steinmetz
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Water Wave ◽  
Ocean Waves ◽  
Wave Climate ◽  
Full Scale ◽  
Scale Model ◽  
Wave Energy Conversion ◽  
Shoreline Protection ◽  
Scale Test

AbstractThis paper is based on the premise that “wave energy conversion” is the conversion of the energy of ocean waves into other energy forms for the benefit of the environment. By taking advantage of the diffraction focusing phenomenon, commonly associated with water wave energy conversion, a bimodal buoy called the Antenna Buoy has been developed to both attract and dissipate incident water wave energy. As a result, arrays of the buoy can be deployed to form an effective floating breakwater system. Results from a full-scale experimental study show that an array of buoys, with each buoy pair separated by about 10 body widths, can dissipate up to 65% of the incident wave energy, where the value of the energy dissipation depends on the wave frequency. To arrive at this value, the full-scale test was conducted in a vertical-walled tank, where wall reflections were from “virtual” units in an array. The full-scale model used in the study is based on the averaged wave climate in the central-to-northern waters of the Chesapeake Bay. In addition to being effective in its design operation, the bimodal buoy can be repositioned or removed, as the site situation might require.

scholarly journals Semi-Analytical Solution of Optimization on Moon-Pool Shaped WEC

2016 ◽  
Vol 23 (s1) ◽  
pp. 25-31 ◽  
Author(s):  
W.C. Zhang ◽  
H.X. Liu ◽  
X.W. Zhang ◽  
L. Zhang
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Ocean Waves ◽  
Maximum Energy ◽  
Wave Energy Converter ◽  
Wave Energy Conversion ◽  
Energy Converter ◽  
Expansion Matching ◽  
Exciting Forces ◽  
Moon Pool

Abstract In order to effectively extract and maximize the energy from ocean waves, a new kind of oscillating-body WEC (wave energy converter) with moon pool has been put forward. The main emphasis in this paper is placed on inserting the damping into the equation of heaving motion applied for a complex wave energy converter and expressions for velocity potential added mass, damping coefficients associated with exciting forces were derived by using eigenfunction expansion matching method. By using surface-wave hydrodynamics, the exact theoretical conditions were solved to allow the maximum energy to be absorbed from regular waves. To optimize the ability of the wave energy conversion, oscillating system models under different radius-ratios are calculated and comparatively analyzed. Numerical calculations indicated that the capture width reaches the maximum in the vicinity of the natural frequency and the new kind of oscillating-body WEC has a positive ability of wave energy conversion.

Biologically Inspired Fluidic Flexible Matrix Composite Pumps for Wave Energy Conversion

2016 ◽  
Author(s):  
Carson Squibb ◽  
LoriAnne Groo ◽  
Adrian Bialy ◽  
Michael Philen
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
High Performance ◽  
High Pressures ◽  
Variable Stiffness ◽  
Ocean Waves ◽  
Input Power ◽  
Matrix Composites ◽  
Wave Energy Conversion ◽  
Flexible Matrix Composite

Inspired by the fibrillar network in plant cell walls and the helical fibers found in soft bodied hydrostats (e.g. worms, squid, elephant trunks, and octopus arms), fluidic flexible matrix composites (F2MCs) are composite tubes that consist of multiple layers of oriented, high performance fibers, such as carbon, precisely placed in a flexible matrix resin to form high-mechanical advantage actuators and variable stiffness materials. Unique to the F2MC tube is its ability to generate high pressures and volume change with a small external load as a result of the stiff reinforcement fiber orientation in the wall of the tube and the soft supporting elastomer. When a load is applied to the tubes, the volume of the composite pump is reduced and fluid is forced out of the tube by the reinforcing fibers. The objective of this research is to design, fabricate and characterize F2MCs for use in wave energy conversion where ocean waves provide the axial load to drive fluid through the pumps. F2MCs pumps are tested in a water basin and mechanically cycled between 0 Hz and 2 Hz at up to 17 percent strain. Instantaneous input power is found by measuring the displacement and applied force to the actuators, while output power values are derived from pressure and flow rate measurements at the tube outlet. From these measurements the actuator efficiency is subsequently determined.

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