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Aerodynamics of a pitching wind turbine blade at high reduced frequencies

Aerodynamics of a pitching wind turbine blade at high reduced frequencies
Aerodynamics of a pitching wind turbine blade at high reduced frequencies
This paper reports the effect of high reduced frequency on the aerodynamics of wind turbine blade under a deep dynamic stall at Reynolds number 135,000, of which the cross section is NACA0012 aerofoil with a constant chord length. Large-eddy simulations (LES) at reduced frequencies 0.1 and 0.15 were validated against reference data in the literature. Our LES data suggest that the lift, drag and moment coefficients are evidently dependent on the pitching frequency. The lift coefficient at the reduced frequency 0.4 increases up to 22% during the upstroke, and 64\% during the downstroke compared to at the reduced frequency 0.2. The peak drag coefficient decreases up to 26% at the reduced frequency 0.4 compared to at the reduced frequency 0.2. The phase angle of dynamic stall shifts towards the downstroke regime as the reduced frequency increases. Pitching motion at the high reduced frequency (e.g. 0.4) significantly enhances the suppression of leading edge vortex during the upstroke, and delays the reattachment of the boundary layer until a very low angle of attack in the downstroke. This study can be beneficial for improvement in the parameterisation of the operational blade element method (BEM) of wind turbine blade design.
Deep dynamic stall, Large-eddy simulation, Leading edge vortex, Pitching wing, Unsteady flow
0167-6105
1-40
Boye, Thankgod, Enatimi
1b12570e-8220-474c-8bf6-0d951cff1fe3
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Boye, Thankgod, Enatimi
1b12570e-8220-474c-8bf6-0d951cff1fe3
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0

Boye, Thankgod, Enatimi and Xie, Zheng-Tong (2022) Aerodynamics of a pitching wind turbine blade at high reduced frequencies. Journal of Wind Engineering and Industrial Aerodynamics, 223, 1-40, [104935]. (doi:10.1016/j.jweia.2022.104935).

Record type: Article

Abstract

This paper reports the effect of high reduced frequency on the aerodynamics of wind turbine blade under a deep dynamic stall at Reynolds number 135,000, of which the cross section is NACA0012 aerofoil with a constant chord length. Large-eddy simulations (LES) at reduced frequencies 0.1 and 0.15 were validated against reference data in the literature. Our LES data suggest that the lift, drag and moment coefficients are evidently dependent on the pitching frequency. The lift coefficient at the reduced frequency 0.4 increases up to 22% during the upstroke, and 64\% during the downstroke compared to at the reduced frequency 0.2. The peak drag coefficient decreases up to 26% at the reduced frequency 0.4 compared to at the reduced frequency 0.2. The phase angle of dynamic stall shifts towards the downstroke regime as the reduced frequency increases. Pitching motion at the high reduced frequency (e.g. 0.4) significantly enhances the suppression of leading edge vortex during the upstroke, and delays the reattachment of the boundary layer until a very low angle of attack in the downstroke. This study can be beneficial for improvement in the parameterisation of the operational blade element method (BEM) of wind turbine blade design.

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More information

Submitted date: 2 July 2021
Published date: 8 March 2022
Keywords: Deep dynamic stall, Large-eddy simulation, Leading edge vortex, Pitching wing, Unsteady flow

Identifiers

Local EPrints ID: 452763
URI: http://eprints.soton.ac.uk/id/eprint/452763
ISSN: 0167-6105
PURE UUID: e7b62e60-32eb-4f7f-aa14-06555a1f7fc1
ORCID for Zheng-Tong Xie: ORCID iD orcid.org/0000-0002-8119-7532

Catalogue record

Date deposited: 20 Dec 2021 17:30
Last modified: 17 Mar 2022 02:38

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Contributors

Author: Thankgod, Enatimi Boye
Author: Zheng-Tong Xie ORCID iD

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