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On the interaction between a turbulent open channel flow and an axial-flow turbine

  • L. P. Chamorro (a1), C. Hill (a1), S. Morton (a1), C. Ellis (a1), R. E. A. Arndt (a1) and F. Sotiropoulos (a1)...

A laboratory experiment was performed to study the dynamically rich interaction of a turbulent open channel flow with a bed-mounted axial-flow hydrokinetic turbine. An acoustic Doppler velocimeter and a torque transducer were used to simultaneously measure at high temporal resolution the three velocity components of the flow at various locations upstream of the turbine and in the wake region and turbine power, respectively. Results show that for sufficiently low frequencies the instantaneous power generated by the turbine is modulated by the turbulent structure of the approach flow. The critical frequency above which the response of the turbine is decoupled from the turbulent flow structure is shown to vary linearly with the angular frequency of the rotor. The measurements elucidate the structure of the turbulent turbine wake, which is shown to persist for at least fifteen rotor diameters downstream of the rotor, and a new approach is proposed to quantify the wake recovery, based on the growth of the largest scale motions in the flow. Spectral analysis is employed to demonstrate the dominant effect of the tip vortices in the energy distribution in the near-wake region and uncover meandering motions.

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

L. P. Chamorro , R. E. A. Arndt & F. Sotiropoulos 2012 Reynolds number dependence of turbulence statistics in the wake of wind turbines. Wind Energy 15, 733742.

L. P. Chamorro & F. Porté-Agel 2010 Effects of thermal stability and incoming boundary-layer flow characteristics on wind-turbine wakes: a wind-tunnel study. Boundary-Layer Meteorol. 136, 515533.

P. L. Fraenkel 2002 Power from marine currents. Proc. Inst. Mech. Engrs, A: J. Power and Energy 216, 114.

C. M. Garcia , M. Cantero , Y. Nino & M. H. Garcia 2005 Turbulence measurements with acoustic Doppler velocimeters. J. Hydraul. Engng 131, 10621073.

C. Garrett & P. Cummins 2007 The efficiency of a turbine in a tidal channel. J. Fluid Mech. 588, 243251.

D. Goring & V. Nikora 2002 Despiking acoustic Doppler velocimeter data. J. Hydraul. Engng 128, 117126.

M. J. Khan , G. Bhuyan , M. T. Iqbal & J. E. Quaicoe 2009 Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: a technology status review. Appl. Energy 86, 18231835.

F. Maganga , G. Germain , J. King , G. Pinon & E. Rivoalen 2010 Experimental characterisation of flow effects on marine current turbine behaviour and on its wake properties. IET Renew. Power Generation 4 (6), 498509.

D. Medici & P. Alfredsson 2008 Measurement behind model wind turbines: further evidence of wake meandering. Wind Energy 11, 211217.

V. Okulov 2004 On the stability of multiple helical tip vortices. J. Fluid Mech. 521, 319342.

V. Okulov & G. A. M. van Kuik 2012 The Betz–Joukowsky limit: on the contribution to rotor aerodynamics by the British, German and Russian scientific schools. Wind Energy 15, 335344.

G. Voulgaris & J. Trowbridge 1998 Evaluation of the acoustic Doppler velocimeter (adv) for turbulence measurements. J. Atmos. Ocean. Technol. 15, 272288.

C. H. K. Williamson 1996 Vortex dynamics in the cylinder wake. Annu. Rev. Fluid Mech. 28, 477539.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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