Experimentally Based Model to Size the Geometry of a  New OWC Device, with Reference to the Mediterranean Sea Wave Environment

Martinelli, Luca; Pezzutto, Paolo; Ruol, Piero

doi:10.3390/en6094696

Cited by 31 publications

(19 citation statements)

References 15 publications

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“…However, if the purpose of the OWC structure is to reduce transmitted waves, vortex-induced energy loss is beneficial to the total energy dissipation and can improve the wave protection performance. To date, most of the studies of OWC focus on the energy extraction (e.g., [23][24][25][26][27][28][29]), and there have only been a few earlier studies touching upon the vorticity characteristics of OWC (e.g., [30][31][32]). Analytical and numerical studies based on potential theory are with certain limitation in dealing with viscous effects, while numerical studies based on viscous flow theory need experimental results for validation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Huang

2016

Energies

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Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Huang

2016

Energies

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“…The Seabreath, under development at Padova University, Italy [58], is a floating attenuator, i.e. its elongated structure is aligned with the propagation direction of the incident waves (Fig.…”

Section: Multi-owc Devicesmentioning

confidence: 99%

Oscillating-water-column wave energy converters and air turbines: A review

2016

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a b s t r a c tThe ocean waves are an important 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 in some cases tested at full size in real ocean conditions. Oscillating-water-column (OWC) devices, of fixed structure or floating, are an important class of wave energy devices. A large part of wave energy converter prototypes deployed so far into the sea are of OWC type. In an OWC, there is a fixed or floating hollow structure, open to the sea below the water surface, that traps air above the inner free-surface. Wave action alternately compresses and decompresses the trapped air which is forced to flow through a turbine coupled to a generator. The paper presents a comprehensive review of OWC technologies and air turbines. This is followed by a survey of theoretical, numerical and experimental modelling techniques of OWC converters. Reactive phase control and phase control by latching are important issues that are addressed, together with turbine rotational speed control.

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“…This is under development at Padova University, Italy. 27 It comprises a set of rectangular chambers with open bottoms aligned with the propagation direction of the incident waves. Another multi-chamber OWC system is the LEANCON, which is arranged in two rows in a V-shaped formation.…”

Section: Developing Challengesmentioning

confidence: 99%

“…A multi–section device is the Seabreath, which is a floating attenuator device equipped with an impulse air–turbine and with a valve for airflow control. This is under development at Padova University, Italy . It comprises a set of rectangular chambers with open bottoms aligned with the propagation direction of the incident waves.…”

Section: Introductionmentioning

confidence: 99%

Multi-chamber oscillating water column wave energy converters and air turbines: A review

2018

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Summary The oscillating water column (OWC) is a more common type of wave energy converter (WEC) that has been the subject of the study and development for several decades. Multi–chamber oscillating water column (MC–OWC) devices or arrays have the advantage of being more efficient in energy extraction compared to a single chamber system, particularly in more chaotic sea states. A variety of single and array OWC devices have been proposed and studied on a small–scale, whereas few large–scale devices have been tested under ocean wave conditions. This paper provides a concise review of the current state of MC–OWC device development in laboratory conditions. The review highlights explicitly the main stages of MC–OWC device development for one ongoing study as an example. This review was based on the available information in the literature from 2003 to 2012, in addition, further work is presented as part of the current study at the University of Technology Sydney. This study is from 2015 to 2018. The discussion shows the challenges that a device needs to overcome to be more competitive with other WECs in the global of wave energy converter area.

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Experimentally Based Model to Size the Geometry of a New OWC Device, with Reference to the Mediterranean Sea Wave Environment

Cited by 31 publications

References 15 publications

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Oscillating-water-column wave energy converters and air turbines: A review

Multi-chamber oscillating water column wave energy converters and air turbines: A review

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