Experimental evaluation of the wake characteristics of cross flow turbine arrays

Stephanie Ordonez-Sanchez, Duncan Sutherland , Gregory Payne, Tom Bruce, Mulualem Gebreslassie, Michael R. Belmont, Ian Moon

Research output: Contribution to journalArticle

8 Citations (Scopus)
19 Downloads (Pure)

Abstract

One key factor in the exploitation of tidal energy is the study of interactions of turbines when working in tidal turbine farms. The Momentum Reversal and Lift (MRL) turbine is a novel cross flow turbine. The three blades rotate around a common central horizontal axis which is parallel to their own axis and perpendicular to the flow. The novelty of the MRL turbine is that it relies on the combination of both lift and momentum reversal (drag) for energy extraction. Scaled MRL turbine models of 0.164 m in diameter were used to characterise the flow in three different tidal array settings. Detailed maps of axial velocity profiles and velocity deficits downstream of the turbine are presented, enabling the visualisation of characteristic flow patterns. The results show that the MRL generates lower velocity deficits and turbulence intensities in the near wake than those associated with horizontal axis turbines. The downstream wake was not completely symmetrical which was related to the geometry of the device but also due to the flow developed in the flume. Amongst the three array configurations studied, a fence of turbines with the lowest separation provided the highest power output.
Original languageEnglish
Pages (from-to)215–226
Number of pages12
JournalOcean Engineering
Volume141
Early online date22 Jun 2017
DOIs
Publication statusPublished - 1 Sep 2017

Keywords

  • marine renewables
  • tidal stream energy
  • arrays
  • scale testing
  • physical modelling
  • wake interactions

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