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A CFD study on the performance of a tidal turbine under various flow and blockage conditions

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  • Koh, W.X.M.
  • Ng, E.Y.K.

Abstract

CFD simulations utilising the actuator disk model have been performed to study the effect of various parameters on the thrust produced by a tidal turbine. Instead of increasing the performance coefficients of the turbine, a turbine placed in blocked conditions is shown to experience a velocity higher than the inflow velocity using a new approach to interpret results from CFD simulations. Turbines were found to produce less thrust when boundary layers were present than when boundary layers were absent in the simulation. Also, the presence of the boundary layer results in an optimal aspect ratio where the performance of a single turbine is maximised. Besides turbulence intensity, the flow velocity is also found to affect the predicted thrust of the turbine. Thrust increases with increasing blockage ratio when channel depth is held constant, and also increases with channel depth while blockage ratio is held constant. The rate of decay of turbulence intensity in the channel is also observed to be dependent on the channel depth, which may have affected results. Thus, the effects of blockage on turbine performance should be studied by varying the channel width without changing the channel depth.

Suggested Citation

  • Koh, W.X.M. & Ng, E.Y.K., 2017. "A CFD study on the performance of a tidal turbine under various flow and blockage conditions," Renewable Energy, Elsevier, vol. 107(C), pages 124-137.
    • Handle: RePEc:eee:renene:v:107:y:2017:i:c:p:124-137
    DOI: 10.1016/j.renene.2017.01.052
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    References listed on IDEAS

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    1. Mycek, Paul & Gaurier, Benoît & Germain, Grégory & Pinon, Grégory & Rivoalen, Elie, 2014. "Experimental study of the turbulence intensity effects on marine current turbines behaviour. Part II: Two interacting turbines," Renewable Energy, Elsevier, vol. 68(C), pages 876-892.
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    5. Myers, L.E. & Bahaj, A.S., 2012. "An experimental investigation simulating flow effects in first generation marine current energy converter arrays," Renewable Energy, Elsevier, vol. 37(1), pages 28-36.
    6. Schluntz, J. & Willden, R.H.J., 2015. "The effect of blockage on tidal turbine rotor design and performance," Renewable Energy, Elsevier, vol. 81(C), pages 432-441.
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    Cited by:

    1. Chen, Long & Hashim, Roslan & Othman, Faridah & Motamedi, Shervin, 2017. "Experimental study on scour profile of pile-supported horizontal axis tidal current turbine," Renewable Energy, Elsevier, vol. 114(PB), pages 744-754.
    2. Zia Ur Rehman & Saeed Badshah & Amer Farhan Rafique & Mujahid Badshah & Sakhi Jan & Muhammad Amjad, 2021. "Effect of a Support Tower on the Performance and Wake of a Tidal Current Turbine," Energies, MDPI, vol. 14(4), pages 1-13, February.
    3. Clemente Gotelli & Mirko Musa & Michele Guala & Cristián Escauriaza, 2019. "Experimental and Numerical Investigation of Wake Interactions of Marine Hydrokinetic Turbines," Energies, MDPI, vol. 12(16), pages 1-17, August.

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