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Flume experiments on the impact of a cross-flow turbine on an erodible bed

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  • Ebrahimi, Mohsen
  • Duncan, Susannah
  • Belmont, Michael R.
  • Kripakaran, Prakash
  • Tabor, Gavin R.
  • Moon, Ian
  • Djordjević, Slobodan

Abstract

Understanding the effect of tidal turbines on local erosion of the estuarine bed is crucial for design and maintenance of turbines with stable foundations and assessment of their environmental impacts. This report describes the results of flume experiments on clear-water scour caused by a single cross-flow turbine in steady flow conditions. The turbine investigated is a Momentum Reversal Lift (MRL) turbine originally designed in collaboration with the University of Exeter. Results show that the turbine can cause significant bed scour, particularly when it was not spinning and in a particular orientation of blades. This is opposite to the previous findings for axial flow turbines. The bottom plate of the turbine, although increasing scour depth, was found to increase the turbine performance and reduce adverse effects on the downstream flow. The findings highlight the importance of regular monitoring and taking immediate repair actions for a tidal installation.

Suggested Citation

  • Ebrahimi, Mohsen & Duncan, Susannah & Belmont, Michael R. & Kripakaran, Prakash & Tabor, Gavin R. & Moon, Ian & Djordjević, Slobodan, 2020. "Flume experiments on the impact of a cross-flow turbine on an erodible bed," Renewable Energy, Elsevier, vol. 153(C), pages 1219-1225.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:1219-1225
    DOI: 10.1016/j.renene.2020.02.073
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    References listed on IDEAS

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    1. Gebreslassie, Mulualem G. & Tabor, Gavin R. & Belmont, Michael R., 2013. "Numerical simulation of a new type of cross flow tidal turbine using OpenFOAM – Part I: Calibration of energy extraction," Renewable Energy, Elsevier, vol. 50(C), pages 994-1004.
    2. Gebreslassie, Mulualem G. & Tabor, Gavin R. & Belmont, Michael R., 2013. "Numerical simulation of a new type of cross flow tidal turbine using OpenFOAM – Part II: Investigation of turbine-to-turbine interaction," Renewable Energy, Elsevier, vol. 50(C), pages 1005-1013.
    3. Hill, Craig & Musa, Mirko & Guala, Michele, 2016. "Interaction between instream axial flow hydrokinetic turbines and uni-directional flow bedforms," Renewable Energy, Elsevier, vol. 86(C), pages 409-421.
    4. Sutherland, Duncan & Ordonez-Sanchez, Stephanie & Belmont, Michael R. & Moon, Ian & Steynor, Jeffrey & Davey, Thomas & Bruce, Tom, 2018. "Experimental optimisation of power for large arrays of cross-flow tidal turbines," Renewable Energy, Elsevier, vol. 116(PA), pages 685-696.
    5. Mirko Musa & Craig Hill & Fotis Sotiropoulos & Michele Guala, 2018. "Performance and resilience of hydrokinetic turbine arrays under large migrating fluvial bedforms," Nature Energy, Nature, vol. 3(10), pages 839-846, October.
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