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Blade loading on tidal turbines for uniform unsteady flow

Author

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  • Milne, I.A.
  • Day, A.H.
  • Sharma, R.N.
  • Flay, R.G.J.

Abstract

An improved characterisation of the unsteady hydrodynamic loads on tidal turbine blades is necessary to enable more reliable predictions of their fatigue life and to avoid premature failures. To this end, this paper presents a set of blade-root bending moment responses for a scale-model tidal turbine subjected to an unsteady planar forcing in a towing tank. In cases where the boundary layer was believed to be attached to the outer sections of the blade, the out-of-plane bending moment amplitude for unsteady flow was up to 15% greater than the corresponding load measured in steady flow and exhibited a phase-lead of up to 4.5°. Both these observations are qualitatively consistent with the effects of dynamic inflow and non-circulatory forcing. The bending moment responses for a forcing time history that comprised multiple frequencies, as well as for a discrete half-sinusoidal perturbation, were able to be reconstructed reasonably well using the responses obtained from single-frequency oscillatory flows. This suggests that blade designers could utilise relatively low fidelity techniques and conduct potentially fewer experimental tests to acquire the fatigue load spectrum.

Suggested Citation

  • Milne, I.A. & Day, A.H. & Sharma, R.N. & Flay, R.G.J., 2015. "Blade loading on tidal turbines for uniform unsteady flow," Renewable Energy, Elsevier, vol. 77(C), pages 338-350.
    • Handle: RePEc:eee:renene:v:77:y:2015:i:c:p:338-350
    DOI: 10.1016/j.renene.2014.12.028
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    1. Khan, M.J. & Bhuyan, G. & Iqbal, M.T. & Quaicoe, J.E., 2009. "Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review," Applied Energy, Elsevier, vol. 86(10), pages 1823-1835, October.
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    2. Ramos, V. & Carballo, R. & Ringwood, John V., 2019. "Application of the actuator disc theory of Delft3D-FLOW to model far-field hydrodynamic impacts of tidal turbines," Renewable Energy, Elsevier, vol. 139(C), pages 1320-1335.
    3. Wang, Shu-qi & Li, Chen-yin & Zhang, Ying & Jing, Feng-mei & Chen, Lin-feng, 2022. "Influence of pitching motion on the hydrodynamic performance of a horizontal axis tidal turbine considering the surface wave," Renewable Energy, Elsevier, vol. 189(C), pages 1020-1032.
    4. Garcia Novo, Patxi & Kyozuka, Yusaku & Ginzo Villamayor, Maria Jose, 2019. "Evaluation of turbulence-related high-frequency tidal current velocity fluctuation," Renewable Energy, Elsevier, vol. 139(C), pages 313-325.
    5. Thiébaut, Maxime & Filipot, Jean-François & Maisondieu, Christophe & Damblans, Guillaume & Duarte, Rui & Droniou, Eloi & Chaplain, Nicolas & Guillou, Sylvain, 2020. "A comprehensive assessment of turbulence at a tidal-stream energy site influenced by wind-generated ocean waves," Energy, Elsevier, vol. 191(C).
    6. Thomas Scarlett, Gabriel & Viola, Ignazio Maria, 2020. "Unsteady hydrodynamics of tidal turbine blades," Renewable Energy, Elsevier, vol. 146(C), pages 843-855.
    7. Alyona Naberezhnykh & David Ingram & Ian Ashton & Joel Culina, 2023. "How Applicable Are Turbulence Assumptions Used in the Tidal Energy Industry?," Energies, MDPI, vol. 16(4), pages 1-21, February.
    8. Vinod, Ashwin & Banerjee, Arindam, 2019. "Performance and near-wake characterization of a tidal current turbine in elevated levels of free stream turbulence," Applied Energy, Elsevier, vol. 254(C).
    9. Murray, Robynne E. & Ordonez-Sanchez, Stephanie & Porter, Kate E. & Doman, Darrel A. & Pegg, Michael J. & Johnstone, Cameron M., 2018. "Towing tank testing of passively adaptive composite tidal turbine blades and comparison to design tool," Renewable Energy, Elsevier, vol. 116(PA), pages 202-214.
    10. Milne, I.A. & Day, A.H. & Sharma, R.N. & Flay, R.G.J., 2016. "The characterisation of the hydrodynamic loads on tidal turbines due to turbulence," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 851-864.
    11. Scarlett, Gabriel Thomas & Sellar, Brian & van den Bremer, Ton & Viola, Ignazio Maria, 2019. "Unsteady hydrodynamics of a full-scale tidal turbine operating in large wave conditions," Renewable Energy, Elsevier, vol. 143(C), pages 199-213.
    12. Mujahid Badshah & Saeed Badshah & James VanZwieten & Sakhi Jan & Muhammad Amir & Suheel Abdullah Malik, 2019. "Coupled Fluid-Structure Interaction Modelling of Loads Variation and Fatigue Life of a Full-Scale Tidal Turbine under the Effect of Velocity Profile," Energies, MDPI, vol. 12(11), pages 1-22, June.

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