Asymmetric effects of a modelled tidal turbine on the flow and seabed

RENEWABLE ENERGY

卷:159

Article

Ramirez-Mendoza, R.^1,2  Murdoch, L.³  Jordan, L. B.^4,5  Amoudry, L. O.¹  McLelland, S.⁵  Cooke, R. D.¹  Thorne, P.¹  Simmons, S. M.⁵  Parsons, D.⁵  Vezza, M.⁶ 

[1] Natl Oceanog Ctr, 6 Brownlow St, Liverpool L3 5DA, Merseyside, England

[2] CICESE, Carr Eda Tij 3918, Playitas 22860, Eda, Mexico

[3] CFD People LTD, 38 Lyle Rd, Airdrie ML6 8NB, Scotland

[4] Univ Edinburgh, Sch Engn, Inst Energy Syst, Edinburgh EH9 3DW, Midlothian, Scotland

[5] Univ Hull, Kingston Upon Hull HU6 7RX, N Humberside, England

[6] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

关键词: Energy;    Turbines;    Sediments;    Tide;    CFD;    PIV;   

DOI  :  10.1016/j.renene.2020.05.133

来源: Elsevier

【 摘 要 】

The extraction of power from the flow of water has become an important potential source of clean energy. In spite of significant interest in the interaction between energy extraction devices and water currents, comparatively little work has focused on flow asymmetry. Indeed, unusual wake behaviour and limits of turbine array efficiency have typically been attributed to boundary effects rather than the particular turbine geometry. The aim of the present study was to reveal the asymmetries in the hydrodynamic wake and the interactions with the sediment bed due to the presence of a hydrokinetic turbine. We combined: (i) computational fluid dynamics simulations; (ii) optical flow measurements from a series of flume experiments above a fixed rough bed; and (iii) acoustic measurements from a further series of flume experiments above a mobile sand bed. Results showed flow asymmetry due to the presence of the rotor which appeared to be related to the development of the wake and potentially to the gyre of the blades. Suspended sediments in the flume also exhibited asymmetrical characteristics due to the flow asymmetry. This imbalance in the flow field and sediment transport may decrease energy extraction efficiency in turbine arrays and also could have important environmental consequences. (c) 2020 Elsevier Ltd. All rights reserved.

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