Unsteady hydrodynamics of a full-scale tidal turbine

Gabriel T. Scarlett, Brian Sellar, Ton van den Bremer, Ignazio Maria Viola

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The rotation of a tidal turbine blade through an unsteady flow field can induce stall delay, load hysterisis and dynamic stall, where the shedding of a leading edge vortex may cause overshoots in lift more than twice that of the quasi-steady value. The significance of these effects for a full-scale tidal turbine rotor operating in realistic wave conditions has yet to be quantified. To investigate, we develop a model which couples dynamic stall, rotational augmentation and blade-element momentum theory with real flow measurements taken during large waves. For a 9 m diameter rotor operating at an optimal tip-speed ratio of 4.5, we find that the flow field is dominated by waves and that flow separation and dynamic stall are confined to sections near the hub. Unsteady attached flow phenomena caused a reduction in the lift available at the outboard sections near the tip which decreased the power coefficient by approximately 3% compared to the steady state value.

Original languageEnglish
Title of host publicationProceedings of the 6th European Conference on Computational Mechanics
Subtitle of host publicationSolids, Structures and Coupled Problems, ECCM 2018 and 7th European Conference on Computational Fluid Dynamics, ECFD 2018
EditorsRoger Owen, Rene de Borst, Jason Reese, Chris Pearce
PublisherInternational Centre for Numerical Methods in Engineering, CIMNE
Pages1163-1176
Number of pages14
ISBN (Electronic)9788494731167
Publication statusPublished - 1 Jan 2020
Externally publishedYes
Event6th ECCOMAS European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS European Conference on Computational Fluid Dynamics, ECFD 2018 - Glasgow, United Kingdom
Duration: 11 Jun 201815 Jun 2018
Conference number: 6

Publication series

NameProceedings of the 6th European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th European Conference on Computational Fluid Dynamics, ECFD 2018

Conference

Conference6th ECCOMAS European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS European Conference on Computational Fluid Dynamics, ECFD 2018
Abbreviated titleECFD 2018
CountryUnited Kingdom
CityGlasgow
Period11/06/1815/06/18

Keywords

  • Blade element momentum theory
  • Dynamic stall
  • Fatigue load
  • Full-scale wave conditions
  • Tidal turbine hydrodynamics
  • Unsteady aerodynamics

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