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An Investigation of Tidal Stream Turbine Wake Development Using Modified BEM–AD Model

Author

Listed:
  • Chee M. Pang

    (Centre of Renewables and Energy (CREDIT), School of Engineering, Dundalk Institute of Technology, A91 K584 Dundalk, Ireland)

  • David M. Kennedy

    (Department of Mechanical Engineering, Technological University Dublin, Bolton Street, D07 H6K8 Dublin, Ireland)

  • Fergal O’Rourke

    (Centre of Renewables and Energy (CREDIT), School of Engineering, Dundalk Institute of Technology, A91 K584 Dundalk, Ireland)

Abstract

Tidal stream turbines (TST) are a promising option for electricity generation to meet the ever-increasing demand for energy. The actuator disk (AD) method is often employed to represent a TST, to evaluate the TST operating in a tidal flow. While this method can effectively reduce the computational cost and provide accurate prediction of far-wake flow conditions, it falls short of fully characterising critical hydrodynamics elements. To address this limitation, a hybrid method is implemented by coupling AD with the blade element momentum (BEM) theory, using detailed performance data, such as thrust, to enhance the prediction of the wake effects. This work focuses on the development of a hybrid BEM–AD method using Reynolds-Averaged Navier–Stokes (RANS) turbulence models within computational fluid dynamics (CFD). Two variations and a hybrid modification of an AD model are presented in this paper. The first modified variation is a velocity variation that takes into account velocity profile inflow into the disk’s configuration. The second modified variation is a radial variation that integrates the blade element theory into the disk’s configuration. The hybrid modified model combines both the velocity profiles influenced and blade element theory in the design and analysis of the actuator disk. Several key investigations on some of the pre-solver parameters are also investigated in this research such as the effect of changing velocity and radial distance on the porosity and loss coefficient of the actuator disk performance. Importantly, this work provides an improved method to evaluate the key wake effects from a TST array which is crucial to determine the power performance of the TST array.

Suggested Citation

  • Chee M. Pang & David M. Kennedy & Fergal O’Rourke, 2024. "An Investigation of Tidal Stream Turbine Wake Development Using Modified BEM–AD Model," Energies, MDPI, vol. 17(5), pages 1-25, March.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1198-:d:1350113
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    References listed on IDEAS

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    1. Fallon, D. & Hartnett, M. & Olbert, A. & Nash, S., 2014. "The effects of array configuration on the hydro-environmental impacts of tidal turbines," Renewable Energy, Elsevier, vol. 64(C), pages 10-25.
    2. Sun, X. & Chick, J.P. & Bryden, I.G., 2008. "Laboratory-scale simulation of energy extraction from tidal currents," Renewable Energy, Elsevier, vol. 33(6), pages 1267-1274.
    3. Badoe, Charles E. & Edmunds, Matt & Williams, Alison J. & Nambiar, Anup & Sellar, Brian & Kiprakis, Aristides & Masters, Ian, 2022. "Robust validation of a generalised actuator disk CFD model for tidal turbine analysis using the FloWave ocean energy research facility," Renewable Energy, Elsevier, vol. 190(C), pages 232-250.
    4. Tian, Wenlong & VanZwieten, James H. & Pyakurel, Parakram & Li, Yanjun, 2016. "Influences of yaw angle and turbulence intensity on the performance of a 20 kW in-stream hydrokinetic turbine," Energy, Elsevier, vol. 111(C), pages 104-116.
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