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Effects of flow depth variations on the wake recovery behind a horizontal-axis hydrokinetic in-stream turbine

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  • Aghsaee, Payam
  • Markfort, Corey D.

Abstract

In-stream hydrokinetic turbines have the potential to produce a significant amount of clean energy from river and tidal currents. This study investigates for the first time the effects of flow depth on the wake behavior downstream of a horizontal axis hydrokinetic turbine. The far wake velocity deficit did not exhibit the symmetric Gaussian profile often found downstream of wind turbines. The flow confinement in an open channel causes the wake to recover more slowly compared to wind tunnel studies with deeper boundary layers. Our results show that with the same local mean kinetic energy, from which the turbine is able to extract energy, a greater total mean kinetic energy in the flow affects the rate of wake recovery. It is observed that for a deeper flow, the mean velocity recovers more rapidly and the turbulence intensity recovers more slowly. In addition to turbulence intensity and thrust coefficient, the ratio of the flow depth to the turbine diameter (H/D) is shown to be an important parameter related to the wake recovery rate. This parameter represents the amount of total incoming mean kinetic energy available for the turbine wake recovery and is much lower for hydrokinetic turbines compared to wind turbines.

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  • Aghsaee, Payam & Markfort, Corey D., 2018. "Effects of flow depth variations on the wake recovery behind a horizontal-axis hydrokinetic in-stream turbine," Renewable Energy, Elsevier, vol. 125(C), pages 620-629.
    • Handle: RePEc:eee:renene:v:125:y:2018:i:c:p:620-629
    DOI: 10.1016/j.renene.2018.02.137
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    Cited by:

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    5. Fouz, D.M. & Carballo, R. & Ramos, V. & Iglesias, G., 2019. "Hydrokinetic energy exploitation under combined river and tidal flow," Renewable Energy, Elsevier, vol. 143(C), pages 558-568.
    6. Fontaine, A.A. & Straka, W.A. & Meyer, R.S. & Jonson, M.L. & Young, S.D. & Neary, V.S., 2020. "Performance and wake flow characterization of a 1:8.7-scale reference USDOE MHKF1 hydrokinetic turbine to establish a verification and validation test database," Renewable Energy, Elsevier, vol. 159(C), pages 451-467.
    7. Niebuhr, C.M. & Schmidt, S. & van Dijk, M. & Smith, L. & Neary, V.S., 2022. "A review of commercial numerical modelling approaches for axial hydrokinetic turbine wake analysis in channel flow," Renewable and Sustainable Energy Reviews, Elsevier, vol. 158(C).
    8. Nitin Kolekar & Ashwin Vinod & Arindam Banerjee, 2019. "On Blockage Effects for a Tidal Turbine in Free Surface Proximity," Energies, MDPI, vol. 12(17), pages 1-20, August.
    9. Karina Soto-Rivas & David Richter & Cristian Escauriaza, 2019. "A Formulation of the Thrust Coefficient for Representing Finite-Sized Farms of Tidal Energy Converters," Energies, MDPI, vol. 12(20), pages 1-17, October.
    10. Craig Hill & Vincent S. Neary & Michele Guala & Fotis Sotiropoulos, 2020. "Performance and Wake Characterization of a Model Hydrokinetic Turbine: The Reference Model 1 (RM1) Dual Rotor Tidal Energy Converter," Energies, MDPI, vol. 13(19), pages 1-21, October.
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