Wave energy extraction by an oscillating water column with a gap on the fully submerged front wall

Şentürk, Utku; Özdamar, Aydoğan

doi:10.1016/j.apor.2012.05.004

Cited by 53 publications

(21 citation statements)

References 14 publications

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“…Martins-rivas and Mei [17] presented a theoretical model for a cylindrical OWC installed on a cliff coast. It was found that air compressibility helps optimize the power absorption efficiency while the angle of incidence significantly affects the waves outside the chamber but not the averaged response inside or the capture length of energy absorption.Şentürk and Özdamar [18] carried out a theoretical analysis of an OWC which had a gap in its fully-submerged front wall. They showed that it is possible to increase the efficiency of an OWC with a surface piercing, barrier-type front wall when appropriate geometrical parameters are taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Chamber Configuration on the Hydrodynamic Efficiency of Oscillating Water Column Devices

Rodríguez

Ilzarbe

Silva

et al. 2020

JMSE

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Based on the two-dimensional linear wave theory, the effects of the front wall thickness and the bottom profile of an Oscillating Water Column (OWC) device on its efficiency were analyzed. Using the potential flow approach, the solution of the associated boundary value problem was obtained via the boundary element method (BEM). Numerical results for several physical parameters and configurations were obtained. The effects of the front wall thickness on the efficiency are discussed in detail, then, various configurations of the chamber bottom are presented. A wider efficiency band was obtained with a thinner front wall. In a real scenario having a thinner front wall means that such a structure could have less capacity to withstand the impact of storm waves. Applying the model for the case of the Mutriku Wave Energy Plant (MWEP), findings showed that the proposed bottom profiles alter the efficiency curve slightly; higher periods of the incoming water waves were found. This could increase the efficiency of the device in the long-wave regime. Finally, the numerical results were compared with those available in the literature, and were found to be in good agreement.

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Section: Introductionmentioning

confidence: 99%

The Influence of the Chamber Configuration on the Hydrodynamic Efficiency of Oscillating Water Column Devices

Rodríguez

Ilzarbe

Silva

et al. 2020

JMSE

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“…Oscillating Water Column (OWC) systems are one of the most popular technologies for wave energy conversion [8,9]. They consist of a partially submerged chamber with an underwater opening on its front and an air turbine.…”

Section: Introductionmentioning

confidence: 99%

Ducted Savonius Turbine Performance: A Multi-Application Approach

et al. 2020

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In the last decades, the public opinion has paid great attention to environmental pollution and global warming. Energy sector has a strong impact on environment. Thus, the use of renewable energies is becoming mandatory. The present paper deals with a study of ducted Savonius turbine performance as a function of geometric and operating parameters. Ducted turbines could be used as power take-off in multiple applications. In this paper, two main applications were studied. The first application is related to the possibility to install the turbine inside building with the purpose of architectonic integration of the system. The second one is related to wave energy harvesting. In both cases the same type of turbine was used to convert input energy (wind or wave energy) into electricity. Turbine performance were studied as a function of turbine overlap ratio, as well as air flux oscillating frequencies. On the basis of the obtained results, turbine performance increase in ducted configuration and a change in best overlap ratio was registered.

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“…Bu tip bir dalga-yapı etkileşimine, bir yenilenebilir enerji kaynağı olan dalga enerjisinden yararlanmak üzere tasarlanmış sistemlerde rastlanır. Buna örnek olarak, salınan su sütunu verilebilir [1,2]. Salınan su sütunu (Şekil 1), denize kısmen batırılmış ve tabanı açık bir basınç odası olarak düşünülebilir.…”

Section: Introductionunclassified

“…Şekil 1. Salınan su sütunu tipi dalga enerjisi dönüştürücü [3] Salınan su sütunu veriminin dalga frekansına göre değişimi analitik [1,2] ve deneysel [4,5] çalışmalarla incelenmiştir. Bu çalışmalarda salınan su sütunu hidrodinamik verimi η'nin, birimsiz dalga sayısı Kh'a göre değişimi Şekil 2'deki gibi verilmiştir.…”

Section: Introductionunclassified

Investigating the Interaction of a Partially Submerged Barrier with Water Waves Using Open-Source Computational Fluid Dynamics

Kaya

Şentürk

2018

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzBu çalışmada, düşey, düzlemsel ve rijit bir bariyerin, sabit genlik ve frekansa sahip su dalgaları ile etkileşimi problemi ele alınmıştır. Öncelikle problemin lineer dalga teorisi altında analitik çözümüne ilişkin yöntem verilmiştir. Daha sonra bir açık kaynaklı hesaplamalı akışkanlar dinamiği yazılımı olan OpenFOAM kapsamındaki modüller aracılığıyla problemin sayısal çözümü gerçekleştirilmiştir. Ön aşama olarak, iki boyutlu sayısal dalga kanalı testleri ile, bu modüllerin dalga oluşturma ve sönümleme gibi özellikleri sınanmıştır. Analitik çözümlere kıyasla görülen en yüksek hata %1 olarak bulunmuştur. Belirlenen ağ ve çözücü özellikleri, batık bariyer probleminin modellenmesinde kullanılmıştır. Bariyerden yansıyan ve üreteçten çıkan dalgalar, lineer dalga teorisine dayalı olarak ayrıştırılmış, böylece yansıma ve iletilme katsayıları hesaplanmıştır. Çeşitli dalga frekansları için bulunan sonuçlar, hem analitik çözümle hem de literatürde yer alan deneysel sonuçlarla karşılaştırmalı olarak değerlendirildiğinde, nicel ve nitel olarak yüksek uyum yakalandığı görülmüştür. Ayrıca, viskozite etkilerinin de hesaba katılmasıyla, lineer teoride ihmal edilen enerji kayıpları da belirlenmiş; bu kayıpların başlıca nedeninin bariyer ucundaki çevri oluşumu olduğu görülmüştür. Bir kısmen batık bariyer uygulaması olan salınan su sütunu ön duvarındaki enerji kayıplarının, salınan su sütunu hidrodinamik verimi üzerindeki etkisi tartışılmıştır. AbstractThe interaction of a vertical, flat, rigid barrier with monochromatic water waves of constant amplitude is considered in this study. The method for the analytical solution to the problem under the assumptions of linear wave theory is introduced. This is followed by the numerical solution to the problem using the modules under the open-source computational fluid dynamics code OpenFOAM. As an initial stage, twodimensional, numerical wave flume tests are carried out where the wave generation and absorbing features are tested. Maximum error relative to analytical solutions is found to be 1%. Grid and solver properties to be used for the submerged barrier problem are determined at this stage. The reflected and incident wave signals are decomposed with an approach based on the linearized theory. Results obtained * Sorumlu yazar for several frequencies are found to be in good agreement with the analytical computations performed here and the experimental results obtained by other researchers. Taking the viscosity effects into account, the amount of energy loss which is neglected in the linearized thory is computed. The vortex formation at the tip is found to be the primary reason for this loss. Effects of the energy losses of the oscillating water column front wall which is a partially submerged barrier application, on the the oscillating water column hydrodynamic efficiency are investigated.

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Wave energy extraction by an oscillating water column with a gap on the fully submerged front wall

Cited by 53 publications

References 14 publications

The Influence of the Chamber Configuration on the Hydrodynamic Efficiency of Oscillating Water Column Devices

The Influence of the Chamber Configuration on the Hydrodynamic Efficiency of Oscillating Water Column Devices

Ducted Savonius Turbine Performance: A Multi-Application Approach

Investigating the Interaction of a Partially Submerged Barrier with Water Waves Using Open-Source Computational Fluid Dynamics

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