Analysis, optimization and demonstration of a new concept of hydrokinetic turbine based on oscillating hydrofoils
|Abstract:||A new concept of hydrokinetic turbine based on oscillating hydrofoils is investigated. The objective of this study is to analyze the unsteady hydrodynamics of oscillating foils, to optimize their motions for maximum power extraction and to demonstrate in practice the potential of such a concept of turbine through experiments on a prototype. The analysis and optimization have been conducted via low Reynolds number, laminar numerical simulations as well as high Reynolds number, Unsteady Reynolds- Averaged Navier-Stokes (URANS) computations. A 2D and 3D numerical methodology relying on the use of sliding interfaces and suitable to the case of foils undergoing oscillations of large amplitudes is presented. Using that numerical strategy, a parametric study is conducted and leads to the identification of the dominant parameters impacting the hydrodynamic performance of the oscillating-foil turbine. Based on a large number of simulations, the performance of the oscillating-foil turbine has been mapped in relevant parametric spaces. In addition, optimal spatial configurations of turbines with tandem foils is also provided. The potential of the oscillating-foils hydrokinetic turbine has also been formally established in this work through field tests on a 2kW tandem-foils prototype. Its performance has been found to be competitive with the best competing technologies based on horizontal-axis rotor-blades. The experimental data have also been used here to validate the numerical models and have been found to strongly support the 3D numerical simulations.|
|Document Type:||Thèse de doctorat|
|Open Access Date:||19 April 2018|
|Collection:||Thèses et mémoires|
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