Efficiency improvement of a self-rectifying radial impulse turbine for wave energy conversion

Elatife, Khalid; Marjani, Abdellatif El

doi:10.1016/j.energy.2019.116257

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…The governing equations are the mass (1), momentum (2) and energy (3) conservation equations, together with an equation of state (6) or 7:…”

Section: Governing Equationsmentioning

confidence: 99%

“…The most common solution are the self-rectifying air turbines [2], although there are other alternatives as the vented OWCs, a novel design that, by using passive rectifying air flow valves in the chamber, works with unidirectional turbines [3]. Among self-rectifying air turbines, Wells (reaction) turbines [4] and impulse turbines, both axial [5], radial [6], or the novel biradial [7], are at the forefront of the developments.…”

Section: Introductionmentioning

confidence: 99%

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Design Selection and Geometry in OWC Wave Energy Converters for Performance

et al. 2021

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Although oscillating water column (OWC) wave energy converters are arguably one of the most studied technologies, it is not clear which chamber geometry, among all of the available alternatives, would provide the best performance at a site of interest. In this work, a numerical model based on the Navier-Stokes equations for two compressible fluids, using a volume-of-fluid interface-capturing approach, is implemented to determine the best performing OWC geometry in a case study off the Port of Vigo (NW Spain). Four general shapes of OWC are analyzed: classic, stepped-bottom, U-shaped and L-shaped, and geometrical variants are investigated. In total, 18 chamber geometries are studied, considering the same turbine geometry in all of them. It was found that the U-shaped and L-shaped designs are the most easily tuned to resonate at a period of interest. Of these two, the L-shaped performs better. The best performance is achieved for an L-shaped OWC design with a shallow entrance, a high horizontal chamber duct and a wide vertical duct, for which a maximum capture-width ratio of 71.6% was achieved.

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“…The governing equations are the mass (1), momentum (2) and energy (3) conservation equations, together with an equation of state (6) or 7:…”

Section: Governing Equationsmentioning

confidence: 99%