Underwater geometrical impact on the hydrodynamic performance of an offshore oscillating water column–wave energy converter

Elhanafi, Ahmed; Fleming, Alan; Macfarlane, Gregor; Leong, ZQ

doi:10.1016/j.renene.2016.12.039

Cited by 70 publications

(20 citation statements)

References 27 publications

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“…The accentuated influence of the turbine damping on the device performance highlights the importance of the appropriate selection of the turbine damping when designing an OWC device, as shown previously by, e.g., [49,[74][75][76][77][78]. For the wave conditions and damping coefficient values tested, the largest damping coefficient (B * = 64.10) is the one showing, generally, the highest values of C WR .…”

Section: Discussionsupporting

confidence: 53%

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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Abstract:The growth of the offshore wind industry in the last couple of decades has made this technology a key player in the maritime sector. The sustainable development of the offshore wind sector is crucial for this to consolidate within a global scenario of climate change and increasing threats to the marine environment. In this context, multipurpose platforms have been proposed as a sustainable approach to harnessing different marine resources and combining their use under the same platform. Hybrid wind-wave systems are a type of multipurpose platform where a single platform combines the exploitation of offshore wind and wave energy. In particular, this paper deals with a novel hybrid wind-wave system that integrates an oscillating water column wave energy converter with an offshore wind turbine on a jacket-frame substructure. The main objective of this paper is to characterise the hydrodynamic response of the WEC sub-system of this hybrid energy converter. A 1:50 scale model was tested under regular and irregular waves to characterise the hydrodynamic response of the WEC sub-system. The results from this analysis lead to the proof of concept of this novel hybrid system; but additionally, to characterising its behaviour and interaction with the wave field, which is a requirement for fully understanding the benefits of hybrid systems.

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Section: Discussionsupporting

confidence: 53%

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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“…OWC, that the energy extraction in long waves can be improved with the increase of the 8 submergence of lips (Elhanafi et al, 2017). Compared to the other device with a larger d2/h, the 9…”

Section:  mentioning

confidence: 99%

“…peak for an isolated stationary offshore OWC (Elhanafi et al, 2017 The frequency response of max  for various submergences of the OWC fore wall (d2/h) is plotted 5 in Fig. 13.…”

Section:  mentioning

confidence: 99%

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Analytical study on wave power extraction from a hybrid wave energy converter

Zheng

Zhang

2018

Ocean Engineering

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In this paper, a hybrid wave energy converter (WEC) is proposed, consisting of a fixed 3 inverted flume with long length and a bottom hole, and a long floating cube hinged with the 4 flume. The inverted flume and the long floating cube works as an oscillating water column 5(OWC) and a rotational float, respectively, to capture power from incident waves. To study the 6 performance of this hybrid WEC, analytical solution of the wave diffraction/radiation problems, 7considering the hydrodynamic interaction between the OWC and the float, is derived based on 8 linear potential flow theory and eigen-function expansion matching method in the two-9dimensional Cartesian coordinate systems. The corresponding hydrodynamic coefficients, such as 10 wave excitation forces, added mass and wave radiation damping, are also obtained, which can be 11further used in evaluation of the maximum theoretical power absorption of the hybrid WEC. 12Results are compared with a parallel study of an isolated OWC and an isolated float. 13Additionally, analytical study on power capture capability of the device for various geometrical 14parameters is then carried out. 15

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“…The device consists in a hollow chamber, open below the water level, where the external incident wave action excites the oscillation of the inner water column, which in turn causes a reciprocating airflow to move towards an air turbine. Studies that investigates the wave energy harvesting performance of such device are widespread (e.g., Morris-Thomas et al, 2007;Lopez et al 2014;He and Huang, 2016a;Elhanafi et al, 2017;Simonetti et al, 2016 and. On the contrary, studies that investigate its effectiveness as anti-reflection device are quite limited Geng, 2012, He andHuang 2016b).…”

Section: Introductionmentioning

confidence: 99%

On the Effectiveness of Oscillating Water Column Devices in Reducing the Agitation in Front of Vertical Walls Harbor Structures

Cappietti¹,

Simonetti²

2018

Int. Conf. Coastal. Eng.

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Wave reflection at harbor structures negatively affects the navigability of entrance canals and harbor tranquility. In case of rubble-mound structures this phenomenon is relatively limited if compared to vertical-wall structures. However, in case of deep waters, the use of the latter is an obliged choice due to economic reasons. Furthermore, vertical wall structures are also the preferred choice of harbor managers since they permit a better design of the berthing structures and help the effective use of space inside the harbor. Reducing the wave reflection at vertical wall structures is thus an important measure. To date, several approaches have been presented in the literature (see for instance Huang et al., 2011, and references therein). The effectiveness of slotted vertical perforated-walls has been studied since many years (most recently: Neelamani et al., 2017). Such kind of structure is often also adopted as frontal and internal wall of caisson breakwaters embodying one or multiple chambers (most recently: Ciocan et al., 2017). Another alternative, so far proposed, are caissons with internal rubble mound (Altomare, C., & Gironella, X., 2014). The so called Oscillating Water Column (OWC) concept, commonly investigated as wave energy converter (Falcão, 2010), can also represent a viable alternative to absorb the incident energy thus decreasing its reflection. However, the studies that investigate its effectiveness as anti-reflection device are quite limited (Liu and Geng, 2012, He and Huang 2016). This work aims to contribute to the present knowledge on the effectiveness of an OWC, embodied in quay walls or harbor breakwaters, as an alternative to reduce the wave reflection at vertical wall structures.

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Underwater geometrical impact on the hydrodynamic performance of an offshore oscillating water column–wave energy converter

Cited by 70 publications

References 27 publications

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

Analytical study on wave power extraction from a hybrid wave energy converter

On the Effectiveness of Oscillating Water Column Devices in Reducing the Agitation in Front of Vertical Walls Harbor Structures

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