Artículos de revistas: "Oscillating water column (OWC)"

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Mia, Mohammad Rashed, Ming Zhao, Helen Wu, Vatsal Dhamelia y Pan Hu. "Hydrodynamic Performance of a Floating Offshore Oscillating Water Column Wave Energy Converter". Journal of Marine Science and Engineering 10, n.º 10 (20 de octubre de 2022): 1551. http://dx.doi.org/10.3390/jmse10101551.

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A floating oscillating water column (OWC) wave energy converter (WEC) supported by mooring lines can be modelled as an elastically supported OWC. The main objective of this paper is to investigate the effects of the frequency ratio on the performance of floating OWC (oscillating water column) devices that oscillate either vertically or horizontally at two different mass ratios (m = 2 and 3) through two-dimensional computational fluid dynamics simulations. The frequency ratio is the ratio of the natural frequency of the system to the wave frequency. Simulations are conducted for nine frequency ratios in the range between 1 and 10. The hydrodynamic efficiency achieves its maximum at the smallest frequency ratio of 1 if the OWC oscillates horizontally and at the largest frequency ratio of 10 if the OWC oscillates vertically. The frequency ratio affects the hydraulic efficiency of the vertical oscillating OWC significantly stronger than that of the horizontal oscillating OWC, especially when it is small. The air pressure and the volume oscillation in OWC is not affected much by the horizontal motion of the OWC but is significantly affected by the vertical motion, especially at small frequency ratios.

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Jasron, Jahirwan Ut, Sudjito Soeparmani, Lilis Yuliati y Djarot B. Darmadi. "Comparison of the performance of oscillating water column devices based on arrangements of water columns". Journal of Mechanical Engineering and Sciences 14, n.º 3 (28 de septiembre de 2020): 7082–93. http://dx.doi.org/10.15282/jmes.14.3.2020.10.0555.

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The hydrodynamic performance of oscillating water column (OWC) depends on the depth of the water, the size of the water column and its arrangement, which affects the oscillation of the water surface in the column. An experimental method was conducted by testing 4 water depths with wave periods of 1-3 s. All data recorded by the sensor is then processed and presented in graphical form. The research focused on analyzing the difference in wave power absorption capabilities of the three geometric types of OWC based on arrangements of water columns. The OWC devices designed as single water column, the double water column in a series arrangement which was perpendicular to the direction of wave propagation, and double water column in which the arrangement of columns was parallel to the direction of wave propagation. This paper discussed several factors affecting the amount of power absorbed by the device. The factors are the ratio of water depth in its relation to wavelength (kh) and the inlet openings ratio (c/h) of the devices. The test results show that if the water depth increases in the range of kh 0.7 to 0.9, then the performance of the double chamber oscillating water column (DCOWC) device is better than the single chamber oscillating water column (SCOWC) device with maximum efficiency for the parallel arrangement 22,4%, series arrangement 20.8% and single column 20.7%. However, when referring to c/h, the maximum energy absorption efficiency for a single column is 27.7%, double column series arrangement is 23.2%, and double column parallel arrangement is 29.5%. Based on the results of the analysis, DCOWC devices in parallel arrangement showed the ability to absorb better wave power in a broader range of wave frequencies. The best wave of power absorption in the three testing models occurred in the wave period T = 1.3 seconds.

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Heath, T. V. "A review of oscillating water columns". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, n.º 1959 (28 de enero de 2012): 235–45. http://dx.doi.org/10.1098/rsta.2011.0164.

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This paper considers the history of oscillating water column (OWC) systems from whistling buoys to grid-connected power generation systems. The power conversion from the wave resource through to electricity via pneumatic and shaft power is discussed in general terms and with specific reference to Voith Hydro Wavegen's land installed marine energy transformer (LIMPET) plant on the Scottish island of Islay and OWC breakwater systems. A report on the progress of other OWC systems and power take-off units under commercial development is given, and the particular challenges faced by OWC developers reviewed.

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Yang, Hyunjai, Hyen-Cheol Jung y WeonCheol Koo. "Oscillating Water Column (OWC) Wave Energy Converter Part 1: Fixed OWC". Journal of Ocean Engineering and Technology 36, n.º 4 (31 de agosto de 2022): 280–94. http://dx.doi.org/10.26748/ksoe.2022.009.

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This study reviews the recent development and research results of a fixed oscillating water column (OWC) wave energy converter (WEC). The OWC WEC can be divided into fixed and floating types based on the installation location and movement of the structure. In this article, the study on a stationary OWC WEC, which is close to commercialization through the accumulation of long-term research achievements, is divided into five research categories with a focus on primary energy conversion research. These research categories include potential-flow-based numerical analysis, wave tank experiments, computational fluid dynamics analyses toward investigation of fluid viscous effects, U-shaped OWC studies that can amplify water surface displacement in the OWC chamber, and studies on OWC prototypes that have been installed and operated in real sea environments. This review will provide an overview of recent research on the stationary OWC WEC and basic information for further detailed studies on the OWC.

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El Barakaz, Abdelhamid, Abdellatif El Marjani y Hamid Mounir. "Effect of wall inclination on the dynamic behaviour of an oscillating water column system". MATEC Web of Conferences 307 (2020): 01021. http://dx.doi.org/10.1051/matecconf/202030701021.

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The Oscillating Water Column device (OWC) is one of the most used Wave Energy Converters (WECs) for wave energy harvesting. It consists essentially of two parts: the pneumatic chamber made of concrete and the bidirectional turbine linked to a generator group for energy production. In this study we are interested in the water motion oscillation inside the chamber resulting from the water level perturbation. This process is characterized by its own natural frequency and global damping. The vertical OWC chamber model is limited by the number of parameters defining the natural frequency and the global damping. The objective of this paper is to improve the performances obtained for the vertical OWC by considering an OWC with inclined sidewalls. For maximum efficiency, the device must operate in the resonance domain where the damping is low and the frequency of incoming waves matches with the natural frequency of the OWC. This will theoretically amplify the pneumatic energy to be converted to a mechanical one in the turbine.

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Nie, Hong Zhan, Ming Zhang y Hong Shen. "Modeling and Simulation of Oscillating Water Column Wave Energy Generator". Advanced Materials Research 610-613 (diciembre de 2012): 2525–29. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2525.

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This paper focuses on the oscillating water column (OWC) wave energy generator. An overall mathematical model is established comprising of the wave energy capture, drive system, permanent magnet synchronous generators (PMSG), vector control, maximum power point tracking (MPPT), and low voltage ride through (LVRT) control. With this mathematical model, an OWC wave energy generator based on PMSG simulation model is set up in Matlab/Simulink environment. A simulation analysis of the model is carried out which is connected to the grid under the condition of wave changes and power system faults. The simulation facilitates the MPPT and the decoupling control of power for OWC wave energy generator. Results show that the system with back-to- back PWM converter operates in a satisfying way and the model established works correctly and effectively.

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Nugraha, I. Made Aditya, I. Gusti Made Ngurah Desnanjaya, Jhon Septin Mourisdo Siregar y Lebrina Ivantry Boikh. "Analysis of oscillating water column technology in East Nusa Tenggara Indonesia". International Journal of Power Electronics and Drive Systems (IJPEDS) 14, n.º 1 (1 de marzo de 2023): 525. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp525-532.

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Utilization of new renewable energy can be one solution to the limitations of fossil energy. Ocean wave energy is renewable energy caused by tides, and this potential can be utilized as a source of electrical energy in Indonesia, especially East Nusa Tenggara. This ocean wave power plant uses oscillating water column (OWC) technology. This wave energy is energy that can be developed and environmentally friendly and available every time. This paper analyzes the amount of energy produced by ocean waves using OWC technology in the East Nusa Tenggara. The benefits of this paper can be used as a reference for planning the construction of a wave power plant around East Nusa Tenggara. The method used is to measure the condition of ocean waves for a year and analyze the amount of energy and electrical power that can be generated by ocean waves with the use of OWC. The results of the analysis show that the use of ocean wave power plants with OWC technology in the waters of East Nusa Tenggara can produce the highest energy of 20,291,728.83 Joules and the lowest is 17,062.62 Joules. The electrical power generated is between 3,645.45 Watt to 4,274,314.37 Watt, and average of power density by ocean waves using OWC is 19,021.89 Watt/m2.

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Mayon, Robert, De-zhi Ning, Chong-wei Zhang y Lars Johanning. "Hydrodynamic Performance of A Porous-Type Land-Fixed Oscillating Water Column Wave Energy Converter". China Ocean Engineering 36, n.º 1 (febrero de 2022): 1–14. http://dx.doi.org/10.1007/s13344-022-0008-9.

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AbstractA hybrid, porous breakwater—Oscillating Water Column (OWC) Wave Energy Converter (WEC) system is put forward and its hydrodynamic performance is investigated using the fully nonlinear, open-source computational fluid dynamics (CFD) model, OpenFOAM. The permeable structure is positioned at the weather side of the OWC device and adjoined to its front wall. A numerical modelling approach is employed in which the interstices within the porous structure are explicitly defined. This permits the flow field development within the porous structure and at the OWC front wall to be observed. The WEC device is defined as a land-fixed, semi-submerged OWC chamber. A range of regular incident waves are generated at the inlet within the numerical tank. The OWC efficiency and the forces on the structure are examined. Results are compared for the simulation cases in which the porous component is present or absent in front of the OWC chamber. It is found that the incorporation of the porous component has minimal effect on the hydrodynamic efficiency of the OWC, reducing the efficiency by less than 5%. Nevertheless, the forces on the front wall of the OWC can be reduced by up to 20% at the higher wave steepness investigated, through inclusion of the porous structure at the OWC front wall. These findings have considerable implications for the design of hybrid OWC—breakwater systems, most importantly in terms of enhancing the durability and survivability of OWC WECs without significant loss of operational efficiency.

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Arrohman, Sigit y Dwi Aries Himawanto. "Peluang Peluang dan tantangan pengembangan teknologi Oscilating Water Column (OWS) di Indonesia." Jurnal Energi dan Teknologi Manufaktur (JETM) 4, n.º 01 (30 de junio de 2021): 37–42. http://dx.doi.org/10.33795/jetm.v4i01.24.

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Renewable energy is one of the government's efforts to increase the source of the national electricity supply and reduce fossil energy sources. Indonesia has the potential to develop renewable energy in the fields of ocean waves, sunlight, water, and geothermal. But of all these, the most promising to become renewable energy development opportunities are water energy, geothermal energy and ocean wave energy. Indonesia as an archipelagic country with an area of 1,904,556 km2 which consists of; 17,508 islands, 5.8 million km2 of ocean and 81,290 million km of beach length, the potential for marine energy, especially ocean waves, is very potential to be empowered as new and renewable alternative primary energy, especially for power generation. This ocean wave power plant has been widely developed, including: buoy type technology, overtopping devices technology, oscillating water column technology. Oscillating Water Column (OWC) is an alternative technology to convert ocean wave energy using an oscillating water column system. The ocean wave conversion technology of the OWC system was chosen because it is suitable in areas with steep coastal topography and has a wave height value between 0.2 m to 1.19 m and even exceeds so that the electricity generated is greater. OWC technology which will be developed for the territory of Indonesia has several opportunities and challenges. Opportunities and challenges that will be faced include the potential for waves, the application of OWC to waterways in Indonesia, OWC systems, and technology investment for the prospect of long-term energy development in Indonesia.

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10

Kushwah, Sagarsingh. "An Oscillating Water Column (OWC): The Wave Energy Converter". Journal of The Institution of Engineers (India): Series C 102, n.º 5 (9 de julio de 2021): 1311–17. http://dx.doi.org/10.1007/s40032-021-00730-7.

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Simonetti, Irene, Andrea Esposito y Lorenzo Cappietti. "Experimental Proof-of-Concept of a Hybrid Wave Energy Converter Based on Oscillating Water Column and Overtopping Mechanisms". Energies 15, n.º 21 (30 de octubre de 2022): 8065. http://dx.doi.org/10.3390/en15218065.

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This paper presents the results of laboratory tests on a hybrid wave energy converter concept, the O2WC (Oscillating-Overtopping Water Column) device. The proposed device aims at providing an alternative to the classical OWC concept, storing part of the wave energy of the highly energetic sea states in a second chamber at atmospheric pressure, through overtopping phenomena. In this way, the maximum airflow rate and air pressure in the OWC chamber are reduced, possibly aiding the safe functioning of the air turbine, and allowing to exploit the excess of energy instead of dissipating it through by-pass valves. The performance of the device is investigated under different incident wave conditions, for different design parameters. The height of the overtopping threshold from the second chamber of the device which allows to maximize the performance has been selected. Results show that the decrease of the primary conversion efficiency of the OWC component of the device caused by the decreased air pressure in the OWC chamber can be partially compensated by the additional energy stored in the overtopping chamber of the O2WC device. Overall, the studied O2WC device has capture width ratio values ranging between 0.3 and 0.7.

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Curran, R., T. P. Stewart y T. J. T. Whittaker. "Design synthesis of oscillating water column wave energy converters: Performance matching". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 211, n.º 6 (1 de septiembre de 1997): 489–505. http://dx.doi.org/10.1243/0957650981537375.

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The matching of a Wells air turbine to an oscillating water column (OWC) is addressed, with particular reference to design synthesis at the Islay prototype wave power converter. The level of damping applied by the turbine must optimize the hydraulic performance of the OWC in order to facilitate efficient conversion from wave power to pneumatic power. Furthermore, a Wells turbine is only able to convert pneumatic power to mechanical power over a limited range of flow coefficients. Therefore, the efficient operational range of the turbine must extend over a sufficient and optimal proportion of the range of flow coefficients generated by the OWC. Suitable analytical models that describe the behaviour of the system are presented and subsequently the wave conditions and conversion performance at the Islay plant are outlined in order to exemplify the design synthesis to be achieved.

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Masoomi, Mobin, Mahdi Yousefifard y Amir Mosavi. "Efficiency Assessment of an Amended Oscillating Water Column Using OpenFOAM". Sustainability 13, n.º 10 (18 de mayo de 2021): 5633. http://dx.doi.org/10.3390/su13105633.

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Oscillating water column (OWC) is an advanced form of wave energy converter (WEC). This study aims at improving the efficiency of an amended OWC through a novel methodology for simulating several vertical plates within the chamber. This paper provides a numerical investigation considering one, two, three, and four vertical plates. The open field operation and manipulation (OpenFOAM) solver is verified based on the Reynolds-Averaged Navier–Stokes (RANS) equation. Results show the number and the position of plates where the convertor’s efficiency improves. The work undertaken here also revealed a reduction in the net force imposed on the convertor’s structure, especially the front wall. Consequently, adding plates acquires more efficiency with lower force on the system.

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Park, Sewan, Kilwon Kim, Jeong-Hwan Oh, Chang-Hyuk Lim, Ji-Yong Park, Keyyong Hong y Seung-Ho Shin. "Effective Method for Evaluating Airflow Rate of Oscillating-Water-Column Pilot Plants". Processes 9, n.º 11 (21 de octubre de 2021): 1884. http://dx.doi.org/10.3390/pr9111884.

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In this study, a method for effectively estimating the airflow rate of the turbine of an oscillating water column (OWC) pilot plant was developed. The validity of the proposed method was verified through computational fluid dynamics simulations. The method was applied to estimate the airflow rate in irregular wave states based on the operation data obtained for the Yongsoo OWC pilot plant installed in the western seas of Jeju Island, South Korea. As an alternative to estimating the airflow rate of the OWC pilot plant, the impulse turbine performance chart-based interpolation method is introduced, and it is shown that the airflow rate time series calculated using the two methods were in good agreement.

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Rahman, Y. A. y Setiyawan. "The Potential of Conversion of Sea Wave Energy to Electric Energy: The Performance of Central Sulawesi West Sea using Oscillating Water Column Technology". IOP Conference Series: Earth and Environmental Science 926, n.º 1 (1 de noviembre de 2021): 012073. http://dx.doi.org/10.1088/1755-1315/926/1/012073.

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Abstract With seas area of 70% larger than land, Indonesia encourages the potential for marine energy as an alternative to renewable energy. One of the technologies developed to utilize ocean energy is the Oscillating Water Column (OWC). The OWC method can convert ocean wave energy by using an oscillation column directing wave energy through the OWC door opening to generate electricity. This study aims to determine the magnitude of the waves utilized in West Central Sulawesi’s seas region include Alindau beach, Marana beach, and Kaliburu beach. Based on wave forecasting using wind data for five years, the maximum wave height for five years is 0.20 m. Estimated power from the calculation results obtained a rate significant with an efficiency level of 11.97%. Alindau is a potential location to develop wave energy.

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Wang, Chen, Siming Zheng y Yongliang Zhang. "A heaving system with two separated oscillating water column units for wave energy conversion". Physics of Fluids 34, n.º 4 (abril de 2022): 047103. http://dx.doi.org/10.1063/5.0086581.

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A theoretical model based on the linear potential theory is presented for two heaving oscillating water column (OWC) devices separated by a gap. The model includes relative motion and phase control between the devices and trapped water columns, and the hydrodynamic performance of the dual-OWC system thence evaluated. Matching conditions are employed along the common interfaces, and the power take-off model and motion equations of the OWC devices are incorporated into the solution procedure. At the top of each chamber, a Wells turbine is installed to extract wave power. To achieve the optimal overall power extraction performance, a numerical strategy of successive approximation is utilized to seek the optimal turbine damping combinations for the separated units. The effects of lip-wall draft and chamber breadth on the performance of a fully-free heaving dual-OWC system are explored. In view of the deficiency of a fully-free heaving system, two alternative optimization strategies are proposed, one focusing on the control of relative motion and phase between the water columns and the heaving devices, the other on utilizing resonance phenomenon inside the gap, achieved by tuning imposed linear spring constants and gap distance, respectively. It is shown that the control between heave motion of devices and water columns inside the chambers is beneficial for extracting more power over a broader range of wave frequencies. Moreover, enhanced extraction is likely over a wider range of wave conditions when the gap distance to wavelength triggers a sloshing mode inside the gap.

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Isoldi, L. A., J. Do A. M. Grimmler, M. Letzow, J. A. Souza, M. Das N. Gomes, L. A. O. Rocha y E. D. Dos Santos. "3D NUMERICAL ANALYSIS ABOUT THE SHAPE INFLUENCE OF THE HYDRO-PNEUMATIC CHAMBER IN AN OSCILLATING WATER COLUMN (OWC)". Revista de Engenharia Térmica 14, n.º 1 (30 de junio de 2015): 03. http://dx.doi.org/10.5380/reterm.v14i1.62106.

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The oceans represent one of the major energy natural resources, which potentially can be used to supply the World energy demand. In the last decades some devices to convert the wave ocean energy into electrical energy have been studied. In this work the operating principle of an Oscillating Water Column (OWC) converter was analyzed with a transient 3D numerical methodology, using the Finite Volume Method (FVM) and the Volume of Fluid (VOF) model. The incident waves on the OWC hydro- pneumatic chamber cause an oscillation of the water column inside the chamber producing an alternate air flow through the chimney. The air drives a turbine that is coupled to an electric generator. The aim of this work was to investigate the shape influence of the hydro-pneumatic chamber geometry in the air flow. For this, six cases were studied in laboratory scale and the results showed that the variation of the OWC chamber shape can improve 12.4% the amount of mass air flow.

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Gomes, M. N., C. D. Nascimento, B. L. Bonafini, E. D. Santos, L. A. Isoldi y L. A. O. Rocha. "TWO-DIMENSIONAL GEOMETRIC OPTIMIZATION OF AN OSCILLATING WATER COLUMN CONVERTER IN LABORATORY SCALE". Revista de Engenharia Térmica 11, n.º 1-2 (31 de diciembre de 2012): 30. http://dx.doi.org/10.5380/reterm.v11i1-2.61996.

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The present paper presents a two-dimensional numerical study about the geometric optimization of an ocean Wave Energy Converter (WEC) into electrical energy that has as operational principal the Oscillating Water Column (OWC). To do so, the Constructal Design fundamentals were employed to vary the degree of freedom H1/L (ratio between height and length of the OWC chamber), while the other degree of freedom H2/l (ration between height and length of chimney) was kept constant. The OWC chamber area (φ1) and the total OWC area (φ2) are also kept fixed, being the problem constraints. In this study was adopted a regular wave with laboratory scale dimensions. The main goal was to optimize the device’s geometry aiming to maximize the absorbed power when it is subjected to a defined wave climate. For the numerical solution it was used the Computational Fluid Dynamic (CFD) commercial code FLUENT®, which is based on the Finite Volume Method (FVM). The multiphasic Volume of Fluid (VOF) model was applied to treat the water-air interaction. The computational domain was represented by an OWC device coupled into a wave tank. Thereby, it was possible to analyze the WEC subjected to regular wave incidence. An optimal geometry was obtained for (H1/L)o=0.84, being this one approximately ten times more efficient then the worst case (H1/L = 0.14), showing the applicability of Constructal Design in this kind of engineering problem.

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Morris-Thomas, Michael T., Rohan J. Irvin y Krish P. Thiagarajan. "An Investigation Into the Hydrodynamic Efficiency of an Oscillating Water Column". Journal of Offshore Mechanics and Arctic Engineering 129, n.º 4 (19 de julio de 2006): 273–78. http://dx.doi.org/10.1115/1.2426992.

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An oscillating water column device enables the conversion of wave energy into electrical energy via wave interaction with a semi-submerged chamber coupled with a turbine for power take off. This present work concentrates on the wave interaction with the semi-submerged chamber, whereby a shore based oscillating water column (OWC) is studied experimentally to examine energy efficiencies for power take-off. The wave environment considered comprises plane progressive waves of steepnesses ranging from kA=0.01 to 0.22 and water depth ratios varying from kh=0.30 to 3.72, where k, A, and h denote the wave number, wave amplitude, and water depth, respectively. The key feature of this experimental campaign is a focus on the influence of front wall geometry on the OWC’s performance. More specifically, this focus includes: front wall draught, thickness, and aperture shape of the submerged front wall. We make use of a two-dimensional inviscid theory for an OWC for comparative purposes and to explain trends noted in the experimental measurements. The work undertaken here has revealed a broad banded efficiency centered about the natural frequency of the OWC. The magnitude and shape of the efficiency curves are influenced by the geometry of the front wall. Typical peak magnitude resonant efficiencies are in the order of 70%.

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Zheng, Siming, Alessandro Antonini, Yongliang Zhang, Jon Miles, Deborah Greaves, Guixun Zhu y Gregorio Iglesias. "Hydrodynamic performance of a multi-Oscillating Water Column (OWC) platform". Applied Ocean Research 99 (junio de 2020): 102168. http://dx.doi.org/10.1016/j.apor.2020.102168.

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Maeda, H., T. Kinoshita, K. Masuda y W. Kato. "Fundamental Research on Oscillating Water Column Wave Power Absorbers". Journal of Energy Resources Technology 107, n.º 1 (1 de marzo de 1985): 81–86. http://dx.doi.org/10.1115/1.3231167.

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An oscillating water column (OWC) wave power absorber is one of the most promising devices, as well as the Salter Duck and the Clam. This paper presents a simple prediction method, in which the equivalent floating body approximation is used, for absorbing wave power characteristics of an oscillating water column device. The effects of the compressibility of air and inertia of an air turbine and electric generator on absorbed wave power are obtained by using the equivalent electric circuit concept. Both the experimental and theoretical studies are carried out in this paper.

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Faulincia, Faulincia. "STUDI POTENSI PEMBANGKIT LISTRIK TENAGA GELOMBANG LAUT DENGAN METODA OSCILATING WATER COLUMN DI PERAIRAN KENDARI INDONESIA". Journal of Mechanical Engineering and Mechatronics 4, n.º 1 (11 de abril de 2019): 7. http://dx.doi.org/10.33021/jmem.v4i1.656.

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Referring to Law Number 30 of 2007 concerning Energy, the development of techniques the conversion of electrical energy by using alternative energy sources is interesting for followed for the past few years. This paper discusses calculation analysis power potential of ocean wave conversion using the Oscilating Water system Column (OWC) in the marine area of Indonesia. This system was chosen because it has many advantages compared to other systems and in accordance with the marine and coastal areas of Indonesia. From the calculation of power, the smallest power that can be produced is equal to 348.5838 Watts while the biggest power that can be produced is 623291.4 Watts The application of the oscillating water column system in Kendari waters with an efficiency of 11.971%. Keywords. oscillating water column (OWC), ocean wave energy, electrical energy, power potential, wavelength

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Pinto Jr, E. A., M. Das N. Gomes, L. A. O. Rocha, E. D. dos Santos y L. A. Isoldi. "EVALUATION OF STATIC PRESSURE BEHAVIOR IN AN OSCILLATING WATER COLUMN WAVE ENERGY CONVERTER". Revista de Engenharia Térmica 18, n.º 1 (3 de junio de 2019): 36. http://dx.doi.org/10.5380/reterm.v18i1.67045.

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The international scenario of non-renewable resources scarcity coupled with increasing energy demand are incentives for the diversification of the world's energy matrix with a focus on renewable energy sources. Among these sources, energy from sea waves is especially attractive because its global resource is estimated around 2 TW, comparable to the average electrical power consumed worldwide each year. There are currently several technologies proposed for the sea wave energy conversion into electricity. Among them it stands out the Oscillating Water Column (OWC) converter, which basically consists of a hydropneumatic chamber and a turbine duct where a turbine is installed. Its chamber is opened below the sea water free surface while the turbine duct outlet is free to atmosphere. Inside the chamber the water free surface oscillating movement produced by the incident waves causes the air to flow through the turbine duct and to activate the turbine, so the OWC principle of operating can be approximated to a cylinder-piston system. Therefore, one of the methodologies used in the computational modeling to simulate the operating principle of this device is the Piston Methodology, which simplifies the problem analysis considering only the air flow through the OWC converter. Among the phenomena that occur within the OWC device, the static pressure behavior is arguably one of the most important because it is through it that it is possible to estimate the hydropneumatic power and the converter efficiency. Thus, the objective of this work is to evaluate the static pressure behavior within the OWC, using the Piston Methodology, by imposing a monochromatic wave boundary condition in an axisymmetric domain. Among the obtained results it was inferred that the static pressure, in this case, depends directly on the flow acceleration and it is strongly influenced by the vorticity generated in domains with a change of area.

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Deng, Zhengzhi, Zhenhua Huang y Adrian W. K. Law. "Wave power extraction from a bottom-mounted oscillating water column converter with a V-shaped channel". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, n.º 2167 (8 de julio de 2014): 20140074. http://dx.doi.org/10.1098/rspa.2014.0074.

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An analytical theory is developed for an oscillating water column (OWC) with a V-shaped channel to improve the pneumatic efficiency of wave energy extraction. An eigenfunction expansion method is used in a cylindrical coordinate system to investigate wave interaction with the OWC converter system. Auxiliary functions are introduced to capture the singular behaviours in the velocity field near the salient corners and cusped edges. Effects of the OWC dimensions, the opening angle and length of the V-shaped channel, as well as the incident wave direction, on the pneumatic efficiency of wave energy extraction are examined. Compared with a system without the V-shaped channel, our results show that the V-shaped channel can significantly increase the conversion efficiency and widen the range of wave frequency over which the OWC system can operate at a high efficiency. For typical coastal water depths, the OWC converter system can perform efficiently when the diameter of the OWC chamber is in the range of 1 5 – 1 2 times the water depth, the opening angle of the V-shaped channel is in the range of [ π /2, 3 π /4] and the length of the V-shaped channel is in the range of 1–1.5 times the water depth.

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Lopez, Ivan, Gregorio Iglesias, Mario Lopez, Francisco Castro y Miguel Ángel Rodríguez. "TURBINE−CHAMBER COUPLING IN AN OWC WAVE ENERGY CONVERTER". Coastal Engineering Proceedings 1, n.º 33 (25 de octubre de 2012): 2. http://dx.doi.org/10.9753/icce.v33.structures.2.

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Oscillating Water Column (OWC) systems are one of the most popular technologies for wave energy conversion. Their main elements are the chamber with the water column and the air turbine. When studying the performance of an OWC system both elements should be considered together, for they are effectively coupled: the damping exerted by the air turbine affects the efficiency of the conversion from wave power to pneumatic power in the OWC chamber, which in turn affects the air flow driving the turbine. The optimum level of damping is that which maximizes the efficiency of the conversion from wave to pneumatic power. In this work the turbine-chamber coupling is studied through a combination of physical and numerical modeling.

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Lee, Hsien Hua y Cheng-Han Chen. "Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater". Energies 13, n.º 8 (14 de abril de 2020): 1926. http://dx.doi.org/10.3390/en13081926.

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This study focuses on the analysis of the parameters of an oscillating water column (OWC) wave energy conversion system and wave conditions. Interactions between the dimensions of the OWC chambers and wave conditions are all taken into account to design an alternative OWC converter, called caisson-based OWC type wave energy converting system. A numerical method using an unsteady Navier-Stokes equations theorem in conservation form is used to analyze the proposed analytical model. The objective of this study is to try to apply an OWC wave energy converter to a caisson breakwater, which has been constructed in a harbor. The structure proposed in this study is a series of sets of independent systems, in which each set of converters is composed of three chambers to capture the wave energy, while better ensuring the safety of the caisson breakwater. Responses to be analyzed related to the conversion efficiency of the caisson-based OWC wave energy converting system include the airflow velocity from the air-chamber, the pneumatic power and the conversion efficiency in terms of a ratio between the pneumatic power and the energy of the incident waves. Parameters examined in this study include the dimensions of the OWC chamber features such as the orifice of the air-chamber allowing airflow in/output, the chamber length along the direction of incident waves, the size of the opening gate for incident waves and the submersion depth of the air-chamber. As found from the results, a best conversion efficiency from incident waves of 32% can be obtained for the extreme case where the orifice is very small, but for most other cases in the study, the best efficiency is about 15%.

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Wang, Zhaozhi, Shemeng Wu y Kai-Hung Lu. "Improvement of Stability in an Oscillating Water Column Wave Energy Using an Adaptive Intelligent Controller". Energies 16, n.º 1 (23 de diciembre de 2022): 133. http://dx.doi.org/10.3390/en16010133.

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Presently, among the global ocean energy technologies, the most conventional one is the wave energy power generation device based on the oscillating water column (OWC) wave energy converter. Given the fluctuation and randomness of waves and the complexity of the current power grid, the dynamic response of grid connections must be considered. Furthermore, considering the characteristics of the wave energy converter, this paper proposed an adaptive intelligent controller (AIC) for the permanent magnet synchronous generator (PMSG) in an OWC. The proposed controller includes a grey predictor, a recurrent wavelet-based Elman neural network (RWENN), and an adaptive critical network (ACN) to improve the stability of OWC power generation. This scheme can increase the maximum power output and improve dynamic performance when a transient occurs under the operating conditions of random wave changes. The proposed AIC for the PMSG based on OWC has a faster response speed, a smaller overshoot, and better stability than the traditional PI controller. This further verifies the availability of the proposed control strategy.

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Wu, Minghao, Vasiliki Stratigaki, Peter Troch, Corrado Altomare, Tim Verbrugghe, Alejandro Crespo, Lorenzo Cappietti, Matthew Hall y Moncho Gómez-Gesteira. "Experimental Study of a Moored Floating Oscillating Water Column Wave-Energy Converter and of a Moored Cubic Box". Energies 12, n.º 10 (15 de mayo de 2019): 1834. http://dx.doi.org/10.3390/en12101834.

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This paper describes experimental research on a floating moored Oscillating Water Column (OWC)-type Wave-Energy Converter (WEC) carried out in the wave flume of the Coastal Engineering Research Group of Ghent University. This research has been introduced to cover the existing data scarcity and knowledge gaps regarding response of moored floating OWC WECs. The obtained data will be available in the future for the validation of nonlinear numerical models. The experiment focuses on the assessment of the nonlinear motion and mooring-line response of a 1:25 floating moored OWC WEC model to regular waves. The OWC WEC model motion has 6 degrees of freedom and is limited by a symmetrical 4-point mooring system. The model is composed of a chamber with an orifice on top of it to simulate the power-take-off (PTO) system and the associated damping of the motion of the OWC WEC model. In the first place, the motion response in waves of the moored floating OWC WEC model is investigated and the water surface elevation in the OWC WEC chamber is measured. Secondly, two different mooring-line materials (iron chains and nylon ropes) are tested and the corresponding OWC WEC model motions and mooring-line tensions are measured. The performance of these two materials is similar in small-amplitude waves but different in large wave-amplitude conditions. Thirdly, the influence of different PTO conditions is investigated by varying the diameter of the top orifice of the OWC WEC model. The results show that the PTO damping does not affect the OWC WEC motion but has an impact on the water surface elevation inside the OWC chamber. In addition, an unbalanced mooring configuration is discussed. Finally, the obtained data for a moored cubic model in waves are presented, which is a benchmarking case for future validation purposes.

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Belibassakis, Kostas, Alexandros Magkouris y Eugen Rusu. "A BEM for the Hydrodynamic Analysis of Oscillating Water Column Systems in Variable Bathymetry". Energies 13, n.º 13 (2 de julio de 2020): 3403. http://dx.doi.org/10.3390/en13133403.

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In this work, a novel Boundary Element Method (BEM) is developed and applied to the investigation of the performance of Oscillating Water Column (OWC) systems, taking into account the interaction of the incident wave field with the bottom topography. The modelling includes the effect of additional upwave walls and barriers used to modify the resonance characteristics of the device and improve its performance as the U-OWC configuration. Numerical results illustrating the effects of depth variation in conjunction with other parameters—such as chamber dimensions as well as the parameters associated with the turbine and power take-off system—on the device performance are presented and discussed. Finally, a case study is presented regarding the potential installation of an OWC in a selected port site in the Black Sea, characterized by a good wave energy potential, on the coast of Romania.

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30

Gomes, Mateus das Neves, Eduardo Alves Amado, Elizaldo Domingues dos Santos, Liércio André Isoldi y Luiz Alberto Oliveira Rocha. "Numerical Analysis of the Oscillating Water Column (OWC) Wave Energy Converter (WEC) Considering Different Incident Wave Height". Defect and Diffusion Forum 370 (enero de 2017): 120–29. http://dx.doi.org/10.4028/www.scientific.net/ddf.370.120.

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The ocean wave energy conversion into electricity has been increasingly researched in the last years. There are several proposed converters, among them the Oscillating Water Column (OWC) device has been widely studied. The present paper presents a two-dimensional numerical investigation about the fluid dynamics behavior of an OWC Wave Energy Converter (WEC) into electrical energy. The main goal of this work was to numerically analyze the optimized geometric shape obtained in previous work under incident waves with different heights. To do so, the OWC geometric shape was kept constant while the incident wave height was varied. For the numerical solution it was used the Computational Fluid Dynamic (CFD) commercial code FLUENT®, based on the Finite Volume Method (FVM). The multiphasic Volume of Fluid (VOF) model was applied to tackle with the water-air interaction. The computational domain is represented by the OWC device coupled with the wave tank. This work allowed to check the influence of the incident wave height on the hydropneumatic power and the amplification factor of the OWC converter. It was possible to identify that the amplification factor increases as the wave period increases, thereby improving the OWC performance. It is worth to highlight that in the real phenomenon the incident waves on the OWC device have periods, lengths and height variables.

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31

George, Arun, Il-Hyoung Cho y Moo-Hyun Kim. "Optimal Design of a U-Shaped Oscillating Water Column Device Using an Artificial Neural Network Model". Processes 9, n.º 8 (30 de julio de 2021): 1338. http://dx.doi.org/10.3390/pr9081338.

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A U-shaped oscillating water column (U-OWC) device has been investigated to enhance power extraction by placing the bottom-mounted vertical barrier in front of a conventional OWC. Then, the optimal design of a U-OWC device has been attempted by using an artificial neural network (ANN) model. First, the analytical model is developed by a matched eigenfunction expansion method (MEEM) based on linear potential theory. Using the developed analytical model, the input and output features for training an ANN model are identified, and then the database containing input and output features is established by a Latin hypercube sampling (LHS) method. With 200 samples, an ANN model is trained with the training data (70%) and validated with the remaining test data (30%). The predictions on output features are made for 4000 random combinations of input features for given significant wave heights and energy periods in irregular waves. From these predictions, the optimal geometric values of a U-OWC are determined by considering both the conversion efficiency and wave force on the barrier. It is found that a well-trained ANN model shows good prediction accuracy and provides the optimal geometric values of a U-OWC suitable for wave conditions at the installation site.

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32

Mohandas, V. P., R. Wilbert, S. S. Saji y Laiju Lukose. "Feasibility Study on Wave Energy Conversion by a Modified Oscillating Water Column Device". Applied Mechanics and Materials 787 (agosto de 2015): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amm.787.8.

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Energy conversion from ocean waves has become the need of the hour in view of the renewable energy awakening occurring all over the world. Energy conversion by Oscillating Water Column (OWC) concept has become an established technology in converting mechanical energy of ocean waves to electrical energy. But the limitations of OWC concept calls for further research and developments to make the technology commercially an attractive one. In this context Boccotti, the Italian scientist advanced the double chamber concept and the implications of the concept still remains to be investigated through model studies. This paper presents the details of a generic study carried out in a physical model device under regular waves.

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Aries Taufik Kurniawan, Arief Budiman, Rachmawan Budiarto y Ridwan Budi Prasetyo. "Wave Energy Potential Using OWC (Oscillating Water Column) System at Pantai Baron, Gunung Kidul, DI Yogyakarta, Indonesia". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 92, n.º 2 (12 de marzo de 2022): 191–201. http://dx.doi.org/10.37934/arfmts.92.2.191201.

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The southern coast of Yogyakarta province in Indonesia has large potential for wave energy, where the most ideal location is Pantai Baron. This research was conducted to study the potential wave energy using OWC (Oscillating Water Column) at Pantai Baron. Wave height and wave periods are needed to find the potential wave energy that can be generated. Wind, fetch and bathymetry data will be used to determine wave height in deep sea. Refraction and shoaling calculation will be used to calculate wave height in shallow depth area. Wave height after refraction-shoaling combine with tidal data will be used to determine optimum position for OWC system. Wave height, wave incoming direction, total efficiency for OWC system and capacity factor will be used to calculate potential wave energy that can be produced. Average wave height on deep sea is 1.08 m, wave period is 9.73 sec and incoming wave dominant is from east. Optimum depth of system OWC is -5.0 m below MSL. Average wave height after refraction and shoaling effect is 1.1 – 1.2 m. Potential wave energy that can be generated is 3.9 – 5.6 MWh per year per 1 OWC system with chamber width is 2.4 m.

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34

Ramezanzadeh, Shayan, Murat Ozbulut y Mehmet Yildiz. "A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems". Energies 15, n.º 21 (5 de noviembre de 2022): 8276. http://dx.doi.org/10.3390/en15218276.

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This work focuses on the geometry effects over the performance of oscillating water column (OWC)-type wave energy converter (WEC) systems and searches for the OWC geometries that enhance the energy efficiencies under the same wave conditions. To analyze the hydrodynamic performances of the WEC systems, an in-house smoothed particle hydrodynamics (SPH) code based on weakly compressible fluid approach is utilized. The energy efficiency enhancement studies of the determined OWC device are carried out with a two-step geometry modification procedure. The first step starts with the validation of the free-surface elevation and orbital velocity time histories. Then, a three-by-three simulation matrix that depends on the geometrical design parameters of chamber length and front wall draft is run at three different wave conditions, and the OWC geometry that produces the maximum energy efficiency is determined. In the second step, the corner regions of the obtained optimal geometry are chamfered, and another simulation matrix is tested at the wave condition that yields maximum wave energy. It is observed in this step that the energy efficiency index can still be improved by 4.3% by only chamfering the back face of the OWC chamber. To scrutinize the physical grounds of this increase, the correlation between the time-averaged vorticity and energy efficiency is presented. Finally, the performance of the best configuration is also examined in three different wave periods, where the suggested geometry shows better performance with respect to base geometry results in all wave conditions.

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35

Portillo Juan, Nerea, Vicente Negro Valdecantos, M. Dolores Esteban y José Santos López Gutiérrez. "Review of the Influence of Oceanographic and Geometric Parameters on Oscillating Water Columns". Journal of Marine Science and Engineering 10, n.º 2 (8 de febrero de 2022): 226. http://dx.doi.org/10.3390/jmse10020226.

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Wave energy is one of the most powerful sources of energy on our planet, but its exploitation is difficult. Much current research on renewable energy is focused on how to harness ocean energy. However, wave energy converter (WEC) technology is still immature and how to reach high levels of efficiency is still unknown. In coming years, this field is likely to reach a high level of development, so it is important to continue research on the improvement of the performance of these devices. One of the most important wave energy converters is the oscillating water column (OWC). The main difficulty of OWCs is that they have to provide good rates of hydrodynamic efficiency for many different types of sea states (different periods, heights, wavelengths, etc.). The other big concern is the optimization of the geometric parameters of the device. This research paper is focused on these two big concerns: how oceanographic parameters affect the hydrodynamic behavior of an OWC and its geometric optimization. Different studies about how wave and geometric characteristics affect the performance of an OWC are reviewed and relationships between these and the hydrodynamic performance of an OWC are finally outlined and summed up.

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Georgiou, Demos P., Kypros F. Milidonis y Eleutherios N. Georgiou. "Sensitivity Analysis for the Encaged Turbine Concept in Oscillating Water Column Plants". ISRN Renewable Energy 2012 (20 de diciembre de 2012): 1–8. http://dx.doi.org/10.5402/2012/987904.

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Oscillating water column plants are one of the most popular wave energy device types. Prototype OWC units have been operating in various parts of the world since the mid-1980s and such developers have more field experience of this technology than any other relevant plant. The most common turbine used is the self-rectifying Well's turbine which has a rather low peak efficiency if compared to other designs but was preferred in terms of its simplicity and cycle performance. The present study exploits the merits of a new concept for the power extraction process, that of an encaged turbine for OWC plants, which allows conventional high-efficiency turbines to be employed in such plants. This is achieved by guiding the pressurized air into a sequence of three chambers, creating a unidirectional closed air circuit through the turbine. A theoretical model is deployed simulating the operation of the plant and a sensitivity analysis is carried out for the design and working parameters. Results indicate that the power extraction efficiency may exceed the 50% level in a real plant.

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37

Lancaster, Orrin, Remo Cossu, Craig Heatherington, Scott Hunter y Tom E. Baldock. "Field Observations of Scour Behavior around an Oscillating Water Column Wave Energy Converter". Journal of Marine Science and Engineering 10, n.º 3 (23 de febrero de 2022): 320. http://dx.doi.org/10.3390/jmse10030320.

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This study provides the first ever published measurements of scour and morphological change around an Oscillating Water Column (OWC) Wave Energy Converter (WEC) device at a real-world site, with the intention of informing future designs to reduce costs of the technology. A 200-kW prototype OWC WEC was deployed at King Island, Tasmania, Australia in January 2021, providing a unique opportunity to monitor the device using a combination of dive footage, multi-beam surveys and bedrock surveys. Settlement of the device was observed and monitored before ceasing once the foundation made contact with the underlying bedrock at the site. It is hypothesized that the settlement is caused by scour undermining the gravity structure’s foundations. The processes causing this scour are explored and possible future design modifications are suggested to reduce the risk of scour and settlement.

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38

Kim, Jeong-Seok y Bo Woo Nam. "Numerical Analysis for Hydrodynamic Performance of OWC Devices with Multiple Chambers in Waves". Journal of Ocean Engineering and Technology 36, n.º 1 (28 de febrero de 2022): 21–31. http://dx.doi.org/10.26748/ksoe.2021.091.

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In recent years, various studies have been conducted on oscillating-water-column-type wave energy converters (OWC-WECs) with multiple chambers with the objective of efficiently utilizing the limited space of offshore/onshore structures. In this study, a numerical investigation based on a numerical wave tank was conducted on single, dual, and triple OWC chambers to examine the hydrodynamic performances and the energy conversion characteristics of the multiple water columns. The boundary value problem with the Laplace equation was solved by using a numerical wave tank based on a finite element method. The validity of the current numerical method was confirmed by comparing it with the measured data in the previous experimental research. We undertook a series of numerical simulations and observed that the water column motion of sloshing mode in a single chamber can be changed into the piston motion of different phases in multiple OWC chambers. Therefore, the piston motion in the multiple chambers can generate considerable airflow at a specific resonant frequency. In addition, the division of the OWC chamber results in a reduction of the time-dependent variability of the final output power from the device. As a result, the application of the multiple chambers leads to an increase of the energy conversion performance as well as a decrease of the variability of the wave energy converter.

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39

Singh, Amitpal, Harikrishnan Eramangalath y Lay Patel. "ENERGY GENERATION SYSTEM USING OSCILLATING WATER COLUMN CONCEPT". International Journal of Engineering Applied Sciences and Technology 7, n.º 1 (1 de mayo de 2022): 73–83. http://dx.doi.org/10.33564/ijeast.2022.v07i01.012.

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the energy demand is estimated to rise considerably over the following decades. The traditional methods of energy production contribute to serious environmental problems, and all countries worldwide are exploring alternative ways to generate electricity. The ocean waves are a vital renewable energy resource that, if extensively exploited, may contribute significantly to the electrical energy supply of countries with coasts facing the sea. A wide variety of technologies has been proposed, studied, and tested at full size in actual ocean conditions. Oscillating-water-column (OWC) devices of fixed or floating are necessary wave energy devices. In this paper, the waves' energy calculation is being studied. The energy contained in the waves striking at the coast of St. Johns, Canada, is shown as an example. Further, the oscillating water column concept application to extract energy from waves is being examined. Finally, the use of Well’s turbine in such an oscillating water column is being studied. The paper summarizes the various equations used to study the oscillating water column and application of well’s turbine in such a system. MATLAB model has been used to calculate the turbine flow coefficient, turbine torque and its mean value, turbine power and its mean value. The characteristics obtained as output of the study align with the typical features of a well’s turbine.

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40

Zheng, Siming, Alessandro Antonini, Yongliang Zhang, Deborah Greaves, Jon Miles y Gregorio Iglesias. "Wave power extraction from multiple oscillating water columns along a straight coast". Journal of Fluid Mechanics 878 (13 de septiembre de 2019): 445–80. http://dx.doi.org/10.1017/jfm.2019.656.

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The integration of oscillating water column (OWC) wave energy converters into a coastal structure (breakwater, jetty, pier, etc.) or, more generally, their installation along the coast is an effective way to increase the accessibility of wave power exploitation. In this paper, a theoretical model is developed based on the linear potential flow theory and eigenfunction matching method to evaluate the hydrodynamic performance of an array of OWCs installed along a vertical straight coast. The chamber of each OWC consists of a hollow vertical circular cylinder, which is half embedded in the wall. The OWC chambers in the theoretical model may have different sizes, i.e. different values of the radius, wall thickness and submergence. At the top of each chamber, a Wells turbine is installed to extract power. The effects of the Wells turbine together with the air compressibility are taken into account as a linear power take-off system. The hydrodynamic and wave power extraction performance of the multiple coast-integrated OWCs is compared with that of a single offshore/coast-integrated OWC and of multiple offshore OWCs. More specifically, we analyse the role of the incident wave direction, chamber size (i.e. radius, wall thickness and submergence), spacing between OWCs and number of OWCs by means of the present theoretical model. It is shown that wave power extraction from the coast-integrated OWCs for a certain range of wave conditions can be significantly enhanced due to both the constructive array effect and the constructive coast effect.

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Luo, Yongyao, Zhengwei Wang, Guangjie Peng, Yexiang Xiao, Liming Zhai, Xin Liu y Qi Zhang. "Numerical simulation of a heave-only floating OWC (oscillating water column) device". Energy 76 (noviembre de 2014): 799–806. http://dx.doi.org/10.1016/j.energy.2014.08.079.

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42

Khaleghi, Sadegh, Tek Tjing Lie y Craig Baguley. "An Overview of the Oscillating Water Column (OWC) Technologies: Issues and Challenges". Journal of Basic & Applied Sciences 18 (8 de diciembre de 2022): 98–118. http://dx.doi.org/10.29169/1927-5129.2022.18.11.

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There is a vast amount of energy available in ocean waves which can contribute to provide the electricity supply specially for countries surrounded by the ocean. This paper provides background knowledge in different techniques to harness the kinetic and potential energy in wave power along with an overview of the recent developments in Oscillating Water Columns Wave Energy Converters. The main purpose of this study is to provide a thorough review on the current state of the technology and methods in Wave Energy Converters and to help scientists to find the future potential and gaps in this area. Moreover, significant research opportunities are identified based on the literature review of the existing research studies, and research problems to be addressed are presented and can be used as tool for the future research in this area.

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43

Medina Rodríguez, Ayrton Alfonso, Gregorio Posada Vanegas, Rodolfo Silva Casarín, Edgar Gerardo Mendoza Baldwin, Beatriz Edith Vega Serratos, Felipe Ernesto Puc Cutz y Enrique Alejandro Mangas Che. "Experimental Investigation of the Hydrodynamic Performance of Land-Fixed Nearshore and Onshore Oscillating Water Column Systems with a Thick Front Wall". Energies 15, n.º 7 (24 de marzo de 2022): 2364. http://dx.doi.org/10.3390/en15072364.

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Most experimental research on land-fixed Oscillating Water Column (OWC) systems assume that the OWC-water wave interaction happens with waves that propagate normally towards the device. However, the angle of incidence of the waves can determine the performance of the OWC, in particular the wave period at which the device resonates. In this study, an experimental investigation to examine the interaction of regular, oblique, water waves with a land-fixed, thick-front wall OWC device in terms of its hydrodynamic performance is reported. A 1:20 Froude scale was used to replicate a single chamber of the Mutriku Wave Energy Plant (MWEP), and a series of tests were carried out in a spectral wave basin. The goal of this study is to look at how incident wave direction and device location affect the hydrodynamic performance of land-fixed OWC systems in regular wave conditions with varying wave heights. The hydraulic performance includes the assessment of the wave amplification factor, hydrodynamic efficiency, the non-dimensional air pressure inside the chamber and non-dimensional water pressures on the chamber walls. The findings show that, for the nearshore OWC device, the period at which resonance occurs decreases when the incident wave angle increases. For the corresponding wave angles, similar results were found for the onshore and nearshore OWC devices, with a slight frequency shift in the bandwidth of the hydrodynamic efficiency. Furthermore, it was found that when wave height increases, the hydrodynamic efficiency improves for both short and long wave periods, with the exception of the resonance period, where the trend is reversed. Finally, regardless of the location, an OWC device with a thick front wall performs well when interacting with intermediate and long-period waves.

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Setiyawan, Erwin Affandi y Lisa Arnita Anzar. "Study on Wave Energy Conversion by Using Oscillating Water Column in Alindau Waters". MATEC Web of Conferences 331 (2020): 03001. http://dx.doi.org/10.1051/matecconf/202033103001.

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Growth electricity consumption in central sulawesi encourages increased utilization of conventional resources such as petroleum products and coal as alternative energy plant. It causes some adverse effect either on the environment, health and economy. As a result, the alternative of conversion energy from non-conventional resources must be provided. Central Sulawesi with coastline about 4,013km has immense potential in developing wave energy as an alternative of Renewable Energy Resource. This paper investigated the potential for wave energy conversion in Lindau Water as an alternative of power plant by using Oscillating Water Column System (OWC). The value of significant wave height and periods are calculated based on the Wilson method, which is then analysed to determine the potential of electricity that feasible converted from wave energy in Lindau waters and potential to applicated wave energy conversion using OWC in Lindau Waters. The result found the conversion of Lindau waters wave energy produce the largest power that can be converted is about 21. 000 watts. Its shows the potential that can be applied to coverage the need electricity by using wave energy in Alindau Village.

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45

M'zoughi, Fares, Izaskun Garrido, Aitor J. Garrido y Manuel De La Sen. "ANN-Based Airflow Control for an Oscillating Water Column Using Surface Elevation Measurements". Sensors 20, n.º 5 (29 de febrero de 2020): 1352. http://dx.doi.org/10.3390/s20051352.

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Oscillating water column (OWC) plants face power generation limitations due to the stalling phenomenon. This behavior can be avoided by an airflow control strategy that can anticipate the incoming peak waves and reduce its airflow velocity within the turbine duct. In this sense, this work aims to use the power of artificial neural networks (ANN) to recognize the different incoming waves in order to distinguish the strong waves that provoke the stalling behavior and generate a suitable airflow speed reference for the airflow control scheme. The ANN is, therefore, trained using real surface elevation measurements of the waves. The ANN-based airflow control will control an air valve in the capture chamber to adjust the airflow speed as required. A comparative study has been carried out to compare the ANN-based airflow control to the uncontrolled OWC system in different sea conditions. Also, another study has been carried out using real measured wave input data and generated power of the NEREIDA wave power plant. Results show the effectiveness of the proposed ANN airflow control against the uncontrolled case ensuring power generation improvement.

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Lee, Hsien Hua, Thung-Yeh Wu, Chung-You Lin y Yung-Fang Chiu. "Structural Safety Analysis for an Oscillating Water Column Wave Power Conversion System Installed in Caisson Structure". Journal of Marine Science and Engineering 8, n.º 7 (9 de julio de 2020): 506. http://dx.doi.org/10.3390/jmse8070506.

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In this study, an alternative way, a so called caisson based type of oscillating water column (OWC) wave energy converting system was proposed to capture and convert wave energy. Since the caisson structure is constructed to protect the coastal line or ports, it is important to know if a built-in associated OWC system will be a burden to affect the safety of the structure or it is safe enough to work appropriately. In this study, three steps of structural analysis were performed: firstly, the analysis for the structural safety of the whole caisson structure; secondly, performing the mechanic analysis for the chamber of the associated OWC system; and finally, performing the analysis for the wave induced air-pressure in the chamber under the design conditions of a local location during the wave-converting operation. For the structural safety analysis, a typical structural model associated with caisson breakwater was built and analyzed while the shape of the structure, material applied to the construction, and associated boundary conditions were all set-up according to the wave and structures. The motion and the strain distribution of the caisson structure subjected to designated waves of 50-year return period were evaluated and compared to the safety requirement by the code. For the analysis of the energy converting performance, a numerical method by using a theorem of unsteady Navier–Stokes equations in conservation form was used to analyze the proposed OWC model when the structure subjected to an incident wave of a 10-year return period.

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47

Tsai, Ching-Piao, Ching-En Huang, Chun-Han Ko y Ying-Chi Chen. "AN EXPERIMENTAL STUDY OF HYDRODYNAMICS OF OWC DEVICE EMBODYING IN CAISSON BREAKWATER". Coastal Engineering Proceedings, n.º 36 (30 de diciembre de 2018): 30. http://dx.doi.org/10.9753/icce.v36.structures.30.

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It has currently become an important issue in searching for clean and sustainable renewable energy. Wave power is one of substantial renewable energies. The oscillating water column (OWC) device is the most extensively studies of wave energy converter and the largest number of prototypes so far deployed into the sea. The breakwater-integrated OWC has been constructed successfully in Sakata harbor in Japan, Mutriku port in Spain, and Civitavecchia harbor in Italy etc. The breakwater-integrated OWC has several advantages, especially much easier maintenance of the wave energy plant (FalcÃ£o and Henriques, 2016). However, the front wall of typical OWC device may be received large wave force when the storm waves impacted on it. This study proposed an improvement of a caisson type breakwater-integrated OWC device by installing a perforated front wall to reduce the wave impacting on the structure but also to promote the capture efficiency of the wave energy. This study reports the experimental results of both water and air flow characteristics inside the OWC chamber to demonstrate the hydrodynamic performance of the improved OWC device.

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Oliveira, Marla Rodrigues, Elizaldo Domingues Santos, Liércio André Isoldi, Luiz Alberto Oliveira Rocha y Mateus das Neves Gomes. "Numerical and Geometrical Analysis of the Onshore Oscillating Water Column Wave Energy with a Ramp". Defect and Diffusion Forum 412 (12 de noviembre de 2021): 11–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.412.11.

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This study is about a two-dimensional numerical analysis of the influence of a ramp in front on an oscillating water column wave energy converter (OWC-WEC). The main purpose was to evaluate, numerically and geometrically, the effect of using a ramp variation in relation to the frontal wall on the hydropneumatic power of the OWC-WEC. The constructal design method was applied for geometric analysis. The problem had a geometric constraint: the area of the ramp (A2) and two degrees of freedom: H2 / L2 (ratio of the height and length of the ramp) and L4 (the distance of the ramp concerning the OWC-WEC front wall). In numerical simulations, the equations of conservation of mass, momentum, and an equation for the transport of volumetric fraction were solved using the finite volume method (FVM). The multiphase model volume of fluid (VOF) was applied for the air-water interaction. Thus, the increase in the H2/L2 ratio resulted in a decrease of the root mean square (RMS) of the available hydropneumatic power (Phyd). By varying the distance L4, the better case was = 6 m and / = 0.025 and the worst case was = 1 m and / = 0.2. The relative difference between the better RMS Phyd = 150.7957 W and the worst Phyd = 73.1164 W reached up to a hundred and six percent.

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49

Abdul Settar, N., S. Sarip y H. M. Kaidi. "Computational Fluid Dynamics Model of Wells Turbine for Oscillating Water Column System: A Review". Journal of Physics: Conference Series 2053, n.º 1 (1 de octubre de 2021): 012013. http://dx.doi.org/10.1088/1742-6596/2053/1/012013.

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Abstract Wells turbine is an important component in the oscillating water column (OWC) system. Thus, many researchers tend to improve the performance via experiment or computational fluid dynamics (CFD) simulation, which is cheaper. As the CFD method becomes more popular, the lack of evidence to support the parameters used during the CFD simulation becomes a big issue. This paper aims to review the CFD models applied to the Wells turbine for the OWC system. Journal papers from the past ten years were summarized in brief critique. As a summary, the FLUENT and CFX software are mostly used to simulate the Wells turbine flow problems while SST k-ω turbulence model is the widely used model. A grid independence test is essential when doing CFD simulation. In conclusion, this review paper can show the research gap for CFD simulation and can reduce the time in selecting suitable parameters when involving simulation in the Wells turbine.

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50

Roh, Chan y Kyong-Hwan Kim. "Deep Learning Prediction for Rotational Speed of Turbine in Oscillating Water Column-Type Wave Energy Converter". Energies 15, n.º 2 (13 de enero de 2022): 572. http://dx.doi.org/10.3390/en15020572.

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This study uses deep learning algorithms to predict the rotational speed of the turbine generator in an oscillating water column-type wave energy converter (OWC-WEC). The effective control and operation of OWC-WECs remain a challenge due to the variation in the input wave energy and the significantly high peak-to-average power ratio. Therefore, the rated power control of OWC-WECs is essential for increasing the operating time and power output. The existing rated power control method is based on the instantaneous rotational speed of the turbine generator. However, due to physical limitations, such as the valve operating time, a more refined rated power control method is required. Therefore, we propose a method that applies a deep learning algorithm. Our method predicts the instantaneous rotational speed of the turbine generator and the rated power control is performed based on the prediction. This enables precise control through the operation of the high-speed safety valve before the energy input exceeds the rated value. The prediction performances for various algorithms, such as a multi-layer perceptron (MLP), recurrent neural network (RNN), long short-term memory (LSTM), and convolutional neural network (CNN), are compared. In addition, the prediction performance of each algorithm as a function of the input datasets is investigated using various error evaluation methods. For the training datasets, the operation data from an OWC-WEC west of Jeju in South Korea is used. The analysis demonstrates that LSTM exhibits the most accurate prediction of the instantaneous rotational speed of a turbine generator and CNN has visible advantages when the data correlation is low.

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