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Experimental characterisation of flow effects on marine current turbine behaviour and on its wake properties

Experimental characterisation of flow effects on marine current turbine behaviour and on its wake properties

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  • Author(s): F. Maganga 1, 2 ; G. Germain 1, 3 ; J. King 4 ; G. Pinon 2 ; E. Rivoalen 5
    • View affiliations
    • Affiliations: 1: IFREMER, Hydrodynamic & Metocean Service, Boulogne-sur-Mer, France
      2: Laboratoire Ondos et Milieux Complexes, FRE 3102 CNRS – Université du Havre, Le Havre, France
      3: Laboratoire Ondos et Milieux Complexes, Univ Lille Nord de France, Lille, France
      4: Engineering Faculty, University of Bristol, Bristol, UK
      5: Engineering Faculty, Laboratoire de Mecanique de Rouen, St Etienne du Rouvay, France
  • Source: Volume 4, Issue 6, November 2010, p. 498 – 509
    DOI:  10.1049/iet-rpg.2009.0205 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Published

Experimental results of tests carried out to investigate the hydrodynamics of marine current turbines are presented. The objective is to build an experimental database in order to validate the numerical developments conducted to characterise the flow perturbations induced by marine current turbines. For that purpose, we used a tri-bladed horizontal axis turbine. The work is dedicated to measuring the behaviour of the system and to characterising the wake generated by the turbine. The efficiency of the device is quantified by the measurement of the thrust and the amount of power generated by the rotor for various inflow conditions, whereas the wake is characterised by Laser Doppler Velocimetry. Particular attention is paid to the flow characteristic effects on the performance of a 0.70 m diameter turbine. The load predictions on the structure and the measured performance of the turbine over its working range of currents and rotational speeds are presented. The results showed that this kind of turbine is sensitive to the quality of the incoming flow. The turbulence intensity effects on turbine behaviour and on its wake are also characterised in order to study how the far wake decays downstream and to estimate the effect produced in downstream turbines.

Inspec keywords: rotors; flow measurement; turbines; blades; hydrodynamics; wakes

Other keywords: rotational speeds; laser Doppler velocimetry; flow turbulence intensity level); flow effects; free surface circulation flume tank; wake properties; rotor; tri-bladed horizontal axis turbine; hydrodynamics; flow orientation; currents; velocity gradient; marine current turbine behaviour

Subjects: Measurement instrumentation and techniques for fluid dynamics; Wakes; Mechanical machinery; Fluid mechanics and aerodynamics (mechanical engineering); Mechanical components

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