Unsteady hydrodynamics of a full-scale tidal turbine

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

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 volume › Conference contribution › Scientific › peer-review

1 Citation (Scopus)

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 language	English
Title of host publication	Proceedings of the 6th European Conference on Computational Mechanics
Subtitle of host publication	Solids, Structures and Coupled Problems, ECCM 2018 and 7th European Conference on Computational Fluid Dynamics, ECFD 2018
Editors	Roger Owen, Rene de Borst, Jason Reese, Chris Pearce
Publisher	International Centre for Numerical Methods in Engineering, CIMNE
Pages	1163-1176
Number of pages	14
ISBN (Electronic)	9788494731167
Publication status	Published - 1 Jan 2020
Externally published	Yes
Event	6th 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 2018 → 15 Jun 2018 Conference number: 6

Publication series

Name	Proceedings 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

Conference	6th 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 title	ECFD 2018
Country/Territory	United Kingdom
City	Glasgow
Period	11/06/18 → 15/06/18

Keywords

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

Cite this

Scarlett, G. T., Sellar, B., van den Bremer, T., & Viola, I. M. (2020). Unsteady hydrodynamics of a full-scale tidal turbine. In R. Owen, R. de Borst, J. Reese, & C. Pearce (Eds.), Proceedings 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 (pp. 1163-1176). (Proceedings 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). International Centre for Numerical Methods in Engineering, CIMNE.

Scarlett, Gabriel T. ; Sellar, Brian ; van den Bremer, Ton et al. / Unsteady hydrodynamics of a full-scale tidal turbine. Proceedings 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. editor / Roger Owen ; Rene de Borst ; Jason Reese ; Chris Pearce. International Centre for Numerical Methods in Engineering, CIMNE, 2020. pp. 1163-1176 (Proceedings 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).

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title = "Unsteady hydrodynamics of a full-scale tidal turbine",

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.",

keywords = "Blade element momentum theory, Dynamic stall, Fatigue load, Full-scale wave conditions, Tidal turbine hydrodynamics, Unsteady aerodynamics",

author = "Scarlett, {Gabriel T.} and Brian Sellar and {van den Bremer}, Ton and Viola, {Ignazio Maria}",

year = "2020",

month = jan,

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language = "English",

series = "Proceedings 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",

publisher = "International Centre for Numerical Methods in Engineering, CIMNE",

pages = "1163--1176",

editor = "Roger Owen and {de Borst}, Rene and Jason Reese and Chris Pearce",

booktitle = "Proceedings of the 6th European Conference on Computational Mechanics",

note = "6th ECCOMAS European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th ECCOMAS European Conference on Computational Fluid Dynamics, ECFD 2018, ECFD 2018 ; Conference date: 11-06-2018 Through 15-06-2018",

}

Scarlett, GT, Sellar, B, van den Bremer, T & Viola, IM 2020, Unsteady hydrodynamics of a full-scale tidal turbine. in R Owen, R de Borst, J Reese & C Pearce (eds), Proceedings 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. Proceedings 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, International Centre for Numerical Methods in Engineering, CIMNE, pp. 1163-1176, 6th 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, 11/06/18.

Unsteady hydrodynamics of a full-scale tidal turbine. / Scarlett, Gabriel T.; Sellar, Brian; van den Bremer, Ton et al.
Proceedings 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. ed. / Roger Owen; Rene de Borst; Jason Reese; Chris Pearce. International Centre for Numerical Methods in Engineering, CIMNE, 2020. p. 1163-1176 (Proceedings 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).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Unsteady hydrodynamics of a full-scale tidal turbine

AU - Scarlett, Gabriel T.

AU - Sellar, Brian

AU - van den Bremer, Ton

AU - Viola, Ignazio Maria

N1 - Conference code: 6

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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.

AB - 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.

KW - Blade element momentum theory

KW - Dynamic stall

KW - Fatigue load

KW - Full-scale wave conditions

KW - Tidal turbine hydrodynamics

KW - Unsteady aerodynamics

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M3 - Conference contribution

AN - SCOPUS:85081053725

T3 - Proceedings 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

SP - 1163

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BT - Proceedings of the 6th European Conference on Computational Mechanics

A2 - Owen, Roger

A2 - de Borst, Rene

A2 - Reese, Jason

A2 - Pearce, Chris

PB - International Centre for Numerical Methods in Engineering, CIMNE

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Y2 - 11 June 2018 through 15 June 2018

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Scarlett GT, Sellar B, van den Bremer T, Viola IM. Unsteady hydrodynamics of a full-scale tidal turbine. In Owen R, de Borst R, Reese J, Pearce C, editors, Proceedings 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. International Centre for Numerical Methods in Engineering, CIMNE. 2020. p. 1163-1176. (Proceedings 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).

Unsteady hydrodynamics of a full-scale tidal turbine

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