Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

Pereiras, Bruno; López, I.; Ruíz, Francisco; Iglesias, G.

doi:10.1016/j.energy.2015.05.018

Cited by 49 publications

(25 citation statements)

References 22 publications

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“…The five parameters defined to characterise the hydrodynamic response of the hybrid device (K R , K T , C WR , RAO C and RAO P ) depend not only on the wave conditions (wave height and period) but also on the damping induced by the orifice on the OWC system [71]. To quantify its influence, the dimensionless damping coefficient (B * ) can be defined, following [49], as…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

2018

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“…Therefore, to get the maximum pneumatic energy, the turbine-induced damping (damping caused by the turbine) should be close to this optimum chamber damping. Once the optimum value of the damping coefficient is found, the dimensioning of the impulse turbine can be carried out following [23]. For values of the damping coefficient close to this optimum value (121.96 < B* < 197.62), the energy captured remains high.…”

Section: Resultsmentioning

confidence: 99%

Holistic performance analysis and turbine-induced damping for an OWC wave energy converter

et al. 2016

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a b s t r a c tAlthough oscillating water column (OWC) systems are one of the most studied types of wave energy converter, developing a method for selecting the optimum turbine for an OWC at a given sitedi.e., subjected to a particular wave climatedremains a current research topic. The objective of this work is to develop and apply a methodology for determining the optimum turbine-induced damping, i.e., that which maximises the performance of the conversion from wave to pneumatic energy, in an OWC equipped with a self-rectifying impulse turbine. The turbine can then be dimensioned to achieve this damping level. Illustrated through a case study, this method adopts a holistic approach encompassing the site-specific wave climate variability. A validated RANS-VOF model is implemented to compute the performance of the OWC for a range of damping coefficients (corresponding to different turbines) and wave conditions, selected based on their energy content and weighted by their occurrence at the site. In this manner, the pneumatic power matrices corresponding to different values of turbine-induced damping are computed, and the optimum damping accounting for the wave climate variability is determined. We find that this methodology may lead to a significant improvement in the annual energy output of the OWC chamber.

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“…Simulation parameters: g = 9.81m/s² k = 1.4 P 0 = 10 5 Pa ρ 0 = 1.2 kg/m 3 ρ s = 1000Kg/m 3 H max = 1.2m F = 0.2 Hz L = 6m D = 2m S = 50m² C = 80 m -1 s -1 [12] For initial conditions, all variables are set to 0.…”

Section: B Resultsmentioning

confidence: 99%

A one-dimentional flow analysis in the OWC device for wave energy conversion

Barakaz

Marjani

2015

2015 3rd International Renewable and Sustainable Energy Conference (IRSEC)

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the main purpose of this paper is to present a 1-D modeling with simple equations to describe the behavior in the oscillating water column device (OWC) used for wave energy conversion. The free water surface inside the chamber is considered as a piston water mass moving up and down due to the successive incident waves from the sea. Analyses are focused on the temporal variation of wave height inside OWC, air flow rate, pressure, and pneumatic power, also, the flow RMS characteristics. The turbine has been simulated with a quadratic law relating the pressure drop to air flow rate in both inhalation and exhalation operations. In the present work, only the case of monochromatic sinusoidal excitations has been considered. A great attention has been paid to examine the chamber and turbine coupling by performing simulations considering some values of wave frequencies and quadratic law constants.

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Non-dimensional analysis for matching an impulse turbine to an OWC (oscillating water column) with an optimum energy transfer

Cited by 49 publications

References 22 publications

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

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

Holistic performance analysis and turbine-induced damping for an OWC wave energy converter

A one-dimentional flow analysis in the OWC device for wave energy conversion

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