Skip to main content
    • Aa
    • Aa
  • Get access
    Check if you have access via personal or institutional login
  • Cited by 81
  • Cited by
    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Thiébot, Jérôme Guillou, Sylvain and Nguyen, Van Thinh 2016. Modelling the effect of large arrays of tidal turbines with depth-averaged Actuator Disks. Ocean Engineering, Vol. 126, p. 265.

    Draper, S. Nishino, T. Adcock, T. A. A. and Taylor, P. H. 2016. Performance of an ideal turbine in an inviscid shear flow. Journal of Fluid Mechanics, Vol. 796, p. 86.

    Plew, David R. and Stevens, Craig L. 2013. Numerical modelling of the effect of turbines on currents in a tidal channel – Tory Channel, New Zealand. Renewable Energy, Vol. 57, p. 269.

    Walkington, Ian and Burrows, Richard 2009. Modelling tidal stream power potential. Applied Ocean Research, Vol. 31, Issue. 4, p. 239.

    Adcock, Thomas A.A. and Draper, Scott 2014. Power extraction from tidal channels – Multiple tidal constituents, compound tides and overtides. Renewable Energy, Vol. 63, p. 797.

    Li, Ye 2014. On the definition of the power coefficient of tidal current turbines and efficiency of tidal current turbine farms. Renewable Energy, Vol. 68, p. 868.

    Bai, Guanghui Li, Guojun Ye, Yanghui and Gao, Tieyu 2015. Numerical analysis of the hydrodynamic performance and wake field of a horizontal axis tidal current turbine using an actuator surface model. Ocean Engineering, Vol. 94, p. 1.

    Laws, Nicholas D. and Epps, Brenden P. 2016. Hydrokinetic energy conversion: Technology, research, and outlook. Renewable and Sustainable Energy Reviews, Vol. 57, p. 1245.

    Walters, Roy A. 2016. A coastal ocean model with subgrid approximation. Ocean Modelling, Vol. 102, p. 45.

    Galloway, Pascal W. Myers, Luke E. and Bahaj, AbuBakr S. 2014. Quantifying wave and yaw effects on a scale tidal stream turbine. Renewable Energy, Vol. 63, p. 297.

    Werle, Michael J. 2016. Wall Blockage Correction for Shrouded Wind Turbines and Propellers. Journal of Propulsion and Power, Vol. 32, Issue. 2, p. 265.

    Fallon, D. Hartnett, M. Olbert, A. and Nash, S. 2014. The effects of array configuration on the hydro-environmental impacts of tidal turbines. Renewable Energy, Vol. 64, p. 10.

    Fleming, Conor F. and Willden, Richard H.J. 2016. Analysis of bi-directional ducted tidal turbine performance. International Journal of Marine Energy, Vol. 16, p. 162.

    Vennell, Ross 2012. The energetics of large tidal turbine arrays. Renewable Energy, Vol. 48, p. 210.

    Neill, Simon P. Jordan, James R. and Couch, Scott J. 2012. Impact of tidal energy converter (TEC) arrays on the dynamics of headland sand banks. Renewable Energy, Vol. 37, Issue. 1, p. 387.

    VENNELL, ROSS 2011. Tuning tidal turbines in-concert to maximise farm efficiency. Journal of Fluid Mechanics, Vol. 671, p. 587.

    Work, Paul A. Haas, Kevin A. Defne, Zafer and Gay, Thomas 2013. Tidal stream energy site assessment via three-dimensional model and measurements. Applied Energy, Vol. 102, p. 510.

    Toniolo, Horacio 2012. Hydrokinetic Assessment of the Kvichak River near Igiugig, Alaska, Using a Two-Dimensional Hydrodynamic Model. Energy and Power Engineering, Vol. 04, Issue. 06, p. 422.

    Wimshurst, Aidan and Willden, Richard 2016. Tidal power extraction on a streamwise bed slope. Ocean Engineering, Vol. 125, p. 70.

    Draper, S. Houlsby, G.T. Oldfield, M.L.G. and Borthwick, A.G.L. 2010. Modelling tidal energy extraction in a depth-averaged coastal domain. IET Renewable Power Generation, Vol. 4, Issue. 6, p. 545.

  • Journal of Fluid Mechanics, Volume 588
  • October 2007, pp. 243-251

The efficiency of a turbine in a tidal channel

  • DOI:
  • Published online: 10 October 2007

There is an upper bound to the amount of power that can be generated by turbines in tidal channels as too many turbines merely block the flow. One condition for achievement of the upper bound is that the turbines are deployed uniformly across the channel, with all the flow through them, but this may interfere with other uses of the channel. An isolated turbine is more effective in a channel than in an unbounded flow, but the current downstream is non-uniform between the wake of the turbines and the free stream. Hence some energy is lost when these streams merge, as may occur in a long channel. We show here, for ideal turbine models, that the fractional power loss increases from 1/3 to 2/3 as the fraction of the channel cross-section spanned by the turbines increases from 0 to close to 1. In another scenario, possibly appropriate for a short channel, the speed of the free stream outside the turbine wake is controlled by separation at the channel exit. In this case, the maximum power obtainable is slightly less than proportional to the fraction of the channel cross-section occupied by turbines.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

A. S. Bahaj , A. F. Molland , J. R. Chaplin & W. M. J. Batten 2007 Power and thrust measurements of marine current turbines under various hydrodynamic flow conditions in a cavitation tunnel and a towing tank. Renewable Energy 32, 407426.

K. H. Bergey 1980 The Lanchester–Betz limit. J. Energy 3, 382384.

C. Garrett & P. Cummins 2004 Generating tidal power from currents. J. Waterway, Port, Coastal, Ocean Engng 130, 114118.

C. Garrett & P. Cummins 2005 The power potential of tidal currents in channels. Proc. R. Soc. Lond. A 461, 25632572.

G. Sutherland , M. Foreman & C. Garrett 2007 Tidal current energy assessment for Johnstone Strait, Vancouver Island. J. Power Energy 221, 147157.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *