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Incorporation of a Non-Constant Thrust Force Coefficient to Assess Tidal-Stream Energy

Author

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  • Lilia Flores Mateos

    (College of Engineering and Informatics, NUI Galway, H91TK33 Galway, Ireland
    Ryan Institute, NUI Galway, H91TK33 Galway, Ireland
    Centre for Marine and Renewable Energy Ireland (MaREI), P43C573 Cork, Ireland
    These authors contributed equally to this work.)

  • Michael Hartnett

    (College of Engineering and Informatics, NUI Galway, H91TK33 Galway, Ireland
    Ryan Institute, NUI Galway, H91TK33 Galway, Ireland
    Centre for Marine and Renewable Energy Ireland (MaREI), P43C573 Cork, Ireland
    These authors contributed equally to this work.)

Abstract

A novel method for modelling tidal-stream energy capture at the regional scale is used to evaluate the performance of two marine turbine arrays configured as a fence and a partial fence. These configurations were used to study bounded and unbounded flow scenarios, respectively. The method implemented uses turbine operating conditions (TOC) and the parametrisation of changes produced by power extraction within the turbine near-field to compute a non-constant thrust coefficient, and it is referred to as a momentum sink TOC. Additionally, the effects of using a shock-capture capability to evaluate the resource are studied by comparing the performance of a gradually varying flow (GVF) and a rapidly varying flow (RVF) solver. Tidal-stream energy assessment of bounded flow scenarios through a full fence configuration is better performed using a GVF solver, because the head drop is more accurately simulated; however, the solver underestimates velocity reductions due to power extraction. On the other hand, assessment of unbounded flow scenarios through a partial fence was better performed by the RVF solver. This scheme approximated the head drop and velocity reduction more accurately, thus suggesting that resource assessment with realistic turbine configurations requires the correct solution of the discontinuities produced in the tidal-stream by power extraction.

Suggested Citation

  • Lilia Flores Mateos & Michael Hartnett, 2019. "Incorporation of a Non-Constant Thrust Force Coefficient to Assess Tidal-Stream Energy," Energies, MDPI, vol. 12(21), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4151-:d:281935
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    References listed on IDEAS

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    Cited by:

    1. Lilia Flores Mateos & Michael Hartnett, 2020. "Hydrodynamic Effects of Tidal-Stream Power Extraction for Varying Turbine Operating Conditions," Energies, MDPI, vol. 13(12), pages 1-23, June.

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