Near wake evolution of a tidal stream turbine due to asymmetric sheared turbulent inflow with different integral length scales

Han, Cong; Banerjee, Arindam

doi:10.1016/j.renene.2024.121833

Title: Near wake evolution of a tidal stream turbine due to asymmetric sheared turbulent inflow with different integral length scales

Journal Article · 06 November 2024 · Renewable Energy

DOI: https://doi.org/10.1016/j.renene.2024.121833 · OSTI ID:2507328

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Lehigh University, Bethlehem, PA (United States); Lehigh University
Lehigh University, Bethlehem, PA (United States)

Tidal stream turbines deployed at highly energetic open water sites are subjected to sheared inflow in the rotor plane. The inflow shear is expected to cause asymmetric loading on the rotor blades and affect the downstream wake. In the current study, two different turbulent inflow conditions, static-high shear and dynamic shear, were generated via an active-grid turbulence generator. A 1:20 scaled three-bladed horizontal axis tidal turbine model was tested in those conditions. The results were compared to a quasi-laminar case with no imposed turbulence or shear. The results show that the high shear reduces the average performance, with a drop of up to 16% in the optimal power coefficient. Besides, the shear profiles increase torque fluctuations and induce significant differences in wake hydrodynamics between the high-speed (upper) and low-speed (lower) regions. The large integral length scales further enhance the load fluctuations perceived by the rotor but have a negligible effect on the mean wake field quantities and the wake recovery. The lower half region featured a faster breakdown of tip vortex structure and a rapid drop of swirl number, a phenomenon conjectured to be a consequence of the strong turbulence intensities and Reynolds stresses in the lower half region. Furthermore, the sheared turbulent inflow also results in a very intensive energy redistribution process towards large-scale, low-frequency motions, which is important to the downstream turbines.

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Research Organization:: Lehigh University, Bethlehem, PA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Grant/Contract Number:: EE0009450

OSTI ID:: 2507328

Journal Information:: Renewable Energy, Journal Name: Renewable Energy Journal Issue: D Vol. 237; ISSN 0960-1481

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Near wake evolution of a tidal stream turbine due to asymmetric sheared turbulent inflow with different integral length scales

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