The effect of the integral length scale of turbulence on a wind turbine aerofoil

Giulio Vita; Hassan Hemida; Thomas Andrianne; Charalampos Baniotopoulos

doi:10.1016/j.jweia.2020.104235

The effect of the integral length scale of turbulence on a wind turbine aerofoil

Giulio Vita^*, Hassan Hemida, Thomas Andrianne, Charalampos Baniotopoulos

^*Corresponding author for this work

Civil Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The effect of free stream turbulence on a DU96w180 wind turbine aerofoil is investigated through wind tunnel experiments. Wind turbine blades experience large scale, high intensity turbulent inflow during their service life. However, the effect of turbulence is normally neglected in the assessment of their aerodynamic performance. This is normally justified based on common assumptions on the effect of the integral length scale of turbulence, which supposedly only acts in the low-frequency range of the energy spectrum, hence affecting the angle of attack instead of the aerodynamic behaviour. In this study, an experimental setup implementing passive grids is developed to vary independently turbulence intensity and integral length scale in wind tunnel testing, with a range spanning I~5–15% and L~8−33cm respectively. Results show that turbulence effects are not negligible even at the largest integral length scales, provided that a critical value for the turbulence intensity is achieved. Turbulence is found to increase mean and fluctuating Lift and delay separation in stalled conditions.

Original language	English
Article number	104235
Journal	Journal of Wind Engineering and Industrial Aerodynamics
Volume	204
DOIs	https://doi.org/10.1016/j.jweia.2020.104235
Publication status	Published - 3 Sept 2020

Bibliographical note

Funding Information:
The authors acknowledge the support of the European Commission's Framework Program ?Horizon 2020?, through the Marie Sk?odowska-Curie Innovative Training Network (ITN) ?AEOLUS4FUTURE ? Efficient harvesting of the wind energy? (H2020-MSCA-ITN-2014: Grant agreement no. 643167) to the present research project. Also, the Cost Action TU1804 WinerCost ? ?Wind Energy to enhance the concept of Smart cities? is gratefully acknowledged, for providing the possibility of a Short Term Scientific Mission, used to conduct this experiment. A special thank goes to Fran?ois Rigo for taking part in the construction of the setup and the run of the experiment, and to Arnaud Fabbri for the realisation of the aerofoil model through 3D printing.

Funding Information:
The authors acknowledge the support of the European Commission’s Framework Program “Horizon 2020” , through the Marie Skłodowska-Curie Innovative Training Network (ITN) “AEOLUS4FUTURE – Efficient harvesting of the wind energy” ( H2020-MSCA-ITN-2014 : Grant agreement no. 643167 ) to the present research project. Also, the Cost Action TU1804 WinerCost – “Wind Energy to enhance the concept of Smart cities” is gratefully acknowledged, for providing the possibility of a Short Term Scientific Mission, used to conduct this experiment. A special thank goes to François Rigo for taking part in the construction of the setup and the run of the experiment, and to Arnaud Fabbri for the realisation of the aerofoil model through 3D printing.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Aerodynamics
Atmospheric turbulence
Integral length scale of turbulence
Passive grid
Wind tunnel
Wind turbine aerofoil

ASJC Scopus subject areas

Civil and Structural Engineering
Renewable Energy, Sustainability and the Environment
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jweia.2020.104235

Cite this

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title = "The effect of the integral length scale of turbulence on a wind turbine aerofoil",

abstract = "The effect of free stream turbulence on a DU96w180 wind turbine aerofoil is investigated through wind tunnel experiments. Wind turbine blades experience large scale, high intensity turbulent inflow during their service life. However, the effect of turbulence is normally neglected in the assessment of their aerodynamic performance. This is normally justified based on common assumptions on the effect of the integral length scale of turbulence, which supposedly only acts in the low-frequency range of the energy spectrum, hence affecting the angle of attack instead of the aerodynamic behaviour. In this study, an experimental setup implementing passive grids is developed to vary independently turbulence intensity and integral length scale in wind tunnel testing, with a range spanning I~5–15% and L~8−33cm respectively. Results show that turbulence effects are not negligible even at the largest integral length scales, provided that a critical value for the turbulence intensity is achieved. Turbulence is found to increase mean and fluctuating Lift and delay separation in stalled conditions.",

keywords = "Aerodynamics, Atmospheric turbulence, Integral length scale of turbulence, Passive grid, Wind tunnel, Wind turbine aerofoil",

author = "Giulio Vita and Hassan Hemida and Thomas Andrianne and Charalampos Baniotopoulos",

note = "Funding Information: The authors acknowledge the support of the European Commission's Framework Program ?Horizon 2020?, through the Marie Sk?odowska-Curie Innovative Training Network (ITN) ?AEOLUS4FUTURE ? Efficient harvesting of the wind energy? (H2020-MSCA-ITN-2014: Grant agreement no. 643167) to the present research project. Also, the Cost Action TU1804 WinerCost ? ?Wind Energy to enhance the concept of Smart cities? is gratefully acknowledged, for providing the possibility of a Short Term Scientific Mission, used to conduct this experiment. A special thank goes to Fran?ois Rigo for taking part in the construction of the setup and the run of the experiment, and to Arnaud Fabbri for the realisation of the aerofoil model through 3D printing. Funding Information: The authors acknowledge the support of the European Commission{\textquoteright}s Framework Program “Horizon 2020” , through the Marie Sk{\l}odowska-Curie Innovative Training Network (ITN) “AEOLUS4FUTURE – Efficient harvesting of the wind energy” ( H2020-MSCA-ITN-2014 : Grant agreement no. 643167 ) to the present research project. Also, the Cost Action TU1804 WinerCost – “Wind Energy to enhance the concept of Smart cities” is gratefully acknowledged, for providing the possibility of a Short Term Scientific Mission, used to conduct this experiment. A special thank goes to Fran{\c c}ois Rigo for taking part in the construction of the setup and the run of the experiment, and to Arnaud Fabbri for the realisation of the aerofoil model through 3D printing. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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N2 - The effect of free stream turbulence on a DU96w180 wind turbine aerofoil is investigated through wind tunnel experiments. Wind turbine blades experience large scale, high intensity turbulent inflow during their service life. However, the effect of turbulence is normally neglected in the assessment of their aerodynamic performance. This is normally justified based on common assumptions on the effect of the integral length scale of turbulence, which supposedly only acts in the low-frequency range of the energy spectrum, hence affecting the angle of attack instead of the aerodynamic behaviour. In this study, an experimental setup implementing passive grids is developed to vary independently turbulence intensity and integral length scale in wind tunnel testing, with a range spanning I~5–15% and L~8−33cm respectively. Results show that turbulence effects are not negligible even at the largest integral length scales, provided that a critical value for the turbulence intensity is achieved. Turbulence is found to increase mean and fluctuating Lift and delay separation in stalled conditions.

AB - The effect of free stream turbulence on a DU96w180 wind turbine aerofoil is investigated through wind tunnel experiments. Wind turbine blades experience large scale, high intensity turbulent inflow during their service life. However, the effect of turbulence is normally neglected in the assessment of their aerodynamic performance. This is normally justified based on common assumptions on the effect of the integral length scale of turbulence, which supposedly only acts in the low-frequency range of the energy spectrum, hence affecting the angle of attack instead of the aerodynamic behaviour. In this study, an experimental setup implementing passive grids is developed to vary independently turbulence intensity and integral length scale in wind tunnel testing, with a range spanning I~5–15% and L~8−33cm respectively. Results show that turbulence effects are not negligible even at the largest integral length scales, provided that a critical value for the turbulence intensity is achieved. Turbulence is found to increase mean and fluctuating Lift and delay separation in stalled conditions.

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The effect of the integral length scale of turbulence on a wind turbine aerofoil

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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Cite this