Detailed flow measurement of the field around tidal turbines with and without biomimetic leading-edge tubercles

Weichao Shi, Mehmet Atlar, Rosemary Norman

Research output: Contribution to journalArticle

11 Citations (Scopus)
29 Downloads (Pure)

Abstract

This paper focuses on implementing detailed flow measurement using advanced Particle Image Velocimetry (PIV) system to investigate the flow mechanism of leading-edge tubercles on tidal turbine blades. Two approaches have been applied: one is 2D PIV to map the flow separation around the blade sections at different radial positions; and the other is Stereo PIV to conduct a volumetric measurement in the wake field to reveal the tip vortex development and also velocity distribution. The research presented in this paper further demonstrates that the leading-edge tubercles can enable the flow to remain attached to the blades and weaken the three dimensional effect which can lead to efficiency loss or the so-called "tip loss". Based on these phenomena that have been observed and concluded from the tests, the mechanism by which leading-edge tubercles can provide additional torque and thrust for a tidal turbine has been explained within this paper.
Original languageEnglish
Pages (from-to)688-707
Number of pages20
JournalRenewable Energy
Volume111
Early online date28 Apr 2017
DOIs
Publication statusPublished - 31 Oct 2017

Keywords

  • particle image velocimetry (PIV)
  • tidal turbine
  • blade design
  • tubercles
  • biomimetic

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