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The unsteady hydrodynamic response of lightly loaded tidal turbines

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  • Ha, Tran Bao Ngoc
  • Sharma, Rajnish N.

Abstract

An investigation on the unsteady hydrodynamic behaviour of a new scale model tidal turbine at the University of Auckland has been conducted, using FAST software from National Renewable Energy Laboratory. The turbine blades are designed to achieve the optimal angle of attack based on maximizing lift-to-drag ratio, and then the distribution of chord lengths and pitch angles is determined. In this way, a highly efficient but a lightly loaded tidal turbine model design utilizing the S814 profile, is achieved. Oscillatory motions of flows with single frequency over a range of current numbers and reduced frequencies have been considered. The investigation shows that the unsteadiness of the hydrodynamics on the blades is governed by the dynamic inflow phenomenon. The mean angle of attack along the blade is maintained at or very near the initial optimal value. The effects of the oscillatory frequency and velocity amplitude on the unsteady hydrodynamic loading are explored. A quasi-steady analysis is used to clarify the hydrodynamic response of the model as a lightly loaded rotor. A mathematical model is added to the investigation to analyse the role of the forcing components relative to oscillatory velocity and acceleration on the phase of the unsteady loading.

Suggested Citation

  • Ha, Tran Bao Ngoc & Sharma, Rajnish N., 2020. "The unsteady hydrodynamic response of lightly loaded tidal turbines," Renewable Energy, Elsevier, vol. 147(P1), pages 1959-1968.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1959-1968
    DOI: 10.1016/j.renene.2019.09.137
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    References listed on IDEAS

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    1. de Jesus Henriques, Tiago A. & Hedges, Terry S. & Owen, Ieuan & Poole, Robert J., 2016. "The influence of blade pitch angle on the performance of a model horizontal axis tidal stream turbine operating under wave–current interaction," Energy, Elsevier, vol. 102(C), pages 166-175.
    2. Ahmed, U. & Apsley, D.D. & Afgan, I. & Stallard, T. & Stansby, P.K., 2017. "Fluctuating loads on a tidal turbine due to velocity shear and turbulence: Comparison of CFD with field data," Renewable Energy, Elsevier, vol. 112(C), pages 235-246.
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    4. Mycek, Paul & Gaurier, Benoît & Germain, Grégory & Pinon, Grégory & Rivoalen, Elie, 2014. "Experimental study of the turbulence intensity effects on marine current turbines behaviour. Part I: One single turbine," Renewable Energy, Elsevier, vol. 66(C), pages 729-746.
    5. Galloway, Pascal W. & Myers, Luke E. & Bahaj, AbuBakr S., 2014. "Quantifying wave and yaw effects on a scale tidal stream turbine," Renewable Energy, Elsevier, vol. 63(C), pages 297-307.
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    1. Nachtane, M. & Tarfaoui, M. & Goda, I. & Rouway, M., 2020. "A review on the technologies, design considerations and numerical models of tidal current turbines," Renewable Energy, Elsevier, vol. 157(C), pages 1274-1288.

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