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Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation

Author

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  • Morris, C.E.
  • O'Doherty, D.M.
  • O'Doherty, T.
  • Mason-Jones, A.

Abstract

The hydrodynamic forces imparted on a tidal turbine rotor, whilst causing it to rotate and hence generate power, will also cause the blades to deform. This deformation will affect the turbine's performance if not included in the early design phase and could lead to a decrease in power output and a reduction in operational life. Conversely, designing blades to allow them to deform slightly may reduce localised stress and therefore prolong the life of the blades and allow the blades to deform in to their optimum operational state. The aim of this paper is to better understand the kinetic energy extraction by varying the material modulus of a turbine blade. Shaft torque/power, blade tip displacement, and axial thrust results are presented for 2, 3 and 4 bladed rotor configurations at peak power extraction. For the rotor design studied the FSI model data show that there is a low sensitivity to blade deformation for the 2, 3 and 4 bladed rotors. However, the results reveal that the 3 bladed rotor displayed maximum hydrodynamic performance as a rigid structure which then decreased as the blade deformed. The 2 and 4 bladed rotor configurations elucidated a slight increase in hydrodynamic performance with deflection.

Suggested Citation

  • Morris, C.E. & O'Doherty, D.M. & O'Doherty, T. & Mason-Jones, A., 2016. "Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation," Renewable Energy, Elsevier, vol. 88(C), pages 30-39.
    • Handle: RePEc:eee:renene:v:88:y:2016:i:c:p:30-39
    DOI: 10.1016/j.renene.2015.10.037
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    References listed on IDEAS

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    1. Mason-Jones, A. & O'Doherty, D.M. & Morris, C.E. & O'Doherty, T. & Byrne, C.B. & Prickett, P.W. & Grosvenor, R.I. & Owen, I. & Tedds, S. & Poole, R.J., 2012. "Non-dimensional scaling of tidal stream turbines," Energy, Elsevier, vol. 44(1), pages 820-829.
    2. Bahaj, A.S. & Batten, W.M.J. & McCann, G., 2007. "Experimental verifications of numerical predictions for the hydrodynamic performance of horizontal axis marine current turbines," Renewable Energy, Elsevier, vol. 32(15), pages 2479-2490.
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    1. Eva Segura & Rafael Morales & José A. Somolinos, 2017. "Cost Assessment Methodology and Economic Viability of Tidal Energy Projects," Energies, MDPI, vol. 10(11), pages 1-27, November.
    2. Segura, E. & Morales, R. & Somolinos, J.A. & López, A., 2017. "Techno-economic challenges of tidal energy conversion systems: Current status and trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 536-550.
    3. Mujahid Badshah & Saeed Badshah & Kushsairy Kadir, 2018. "Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment," Energies, MDPI, vol. 11(7), pages 1-13, July.
    4. Segura, E. & Morales, R. & Somolinos, J.A., 2018. "A strategic analysis of tidal current energy conversion systems in the European Union," Applied Energy, Elsevier, vol. 212(C), pages 527-551.
    5. Wang, Lin & Kolios, Athanasios & Cui, Lin & Sheng, Qihu, 2018. "Flexible multibody dynamics modelling of point-absorber wave energy converters," Renewable Energy, Elsevier, vol. 127(C), pages 790-801.

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    Keywords

    CFD; FEA; Tidal stream turbine; FSI; TST;
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