Assessing the performance and the wake recovery rate of flapping-foil turbines with end-plates and detached end-plates

Thierry Villeneuve, Matthieu Boudreau and Guy Dumas

Renewable Energy, 2021, vol. 179, issue C, 206-222

Abstract: Three-dimensional numerical simulations of hydrokinetic flapping-foil turbines with fully-prescribed motions are carried out using a Delayed Detached-Eddy Simulation (DDES) approach. The objective is to assess the efficiency and the wake recovery rate of flapping-foil turbines equipped with either end-plates or detached end-plates. The power coefficient and the mean streamwise velocity recovery in the wake of a turbine with different geometries of end-plates and detached end-plates are analyzed and the results are compared to a high-efficiency reference turbine without end-plates. We show that the turbine efficiency is significantly increased when detached end-plates are used. Indeed, the best configuration simulated in this work has an efficiency value that is 21% larger than that of the reference turbine. Moreover, the main physical mechanisms affecting the wake recovery rate are the same whether or not detached end-plates are used. Interestingly, for a turbine with small detached end-plates, the mean streamwise velocity recovery in the wake is similar to that of the reference turbine, while the efficiency is increased by 15%. This suggests that such detached end-plates could be quite beneficial for flapping-foil turbines operating in turbine farms.

Keywords: Hydrokinetic turbine; Flapping-foil turbine; Oscillating-foil turbine; Turbine farm; Turbine array; Tip vortex (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:179:y:2021:i:c:p:206-222

DOI: 10.1016/j.renene.2021.07.004

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