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Experimental study of the turbulent flow in the wake of a horizontal axis tidal current turbine

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  • Di Felice, Fabio
  • Capone, Alessandro
  • Romano, Giovanni Paolo
  • Alves Pereira, Francisco

Abstract

A scaled-model of a horizontal axis tidal current turbine (HATCT) is tested in the CNR-INM Circulating Water Channel. The experiments are designed to establish in the first place the performances of the turbine at different working settings. The second goal is to investigate the hydrodynamics generated by the turbine in the near wake using the Particle Image Velocimetry (PIV) technique. For this purpose, velocity measurements are performed in a longitudinal plane and phase-locked to the rotor angle in order to resolve the wake structure at different working regimes. The analysis of the axial and radial velocity fields reveals the flow features of the slipstream, as well as its expansion and dependence on the turbine operating parameters. Analysis of the non-diagonal terms of the Reynolds stress tensor provides insight into the onset of tip vortex pairing and of vortex instabilities. Furthermore the separate contributions of transport, production and dissipation to the turbulent kinetic energy in the wake field are discussed in detail. The vortex unsteadiness is captured and correlated with the evolution of the kinetic energy transport and production terms. Understanding these phenomenologies is an important step to develop computational tools able to estimate the radiated noise or the potential impact of turbulence on performances of further rotors placed in the wake, as in an array of tidal turbines.

Suggested Citation

  • Di Felice, Fabio & Capone, Alessandro & Romano, Giovanni Paolo & Alves Pereira, Francisco, 2023. "Experimental study of the turbulent flow in the wake of a horizontal axis tidal current turbine," Renewable Energy, Elsevier, vol. 212(C), pages 17-34.
    • Handle: RePEc:eee:renene:v:212:y:2023:i:c:p:17-34
    DOI: 10.1016/j.renene.2023.04.128
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    References listed on IDEAS

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