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The effects of free-stream turbulence on the performance of a model wind turbine

The effects of free-stream turbulence on the performance of a model wind turbine
The effects of free-stream turbulence on the performance of a model wind turbine
Free-stream turbulence characteristics play an important role in the mechanisms of power harvesting for wind turbines. Acquisitions of power and thrust from a model wind turbine of diameter 0:18m have been carried out in a wind tunnel for a wide range of turbulent base flows, with varying free-stream turbulence intensity in the range between 3% and 16% and integral time scale spanning from 0:1 to 10 times the turbine rotation period. The results demonstrate that power is significantly affected both by the inflow turbulence scales and its intensity, while thrust is scarcely affcted by free-stream turbulence. Fluctuations in the generated torques are also measured, with their behaviour dominated by the free-stream turbulence scale, and only moderately affected by turbulence intensity. The frequency response of thrust fluctuations has been measured for a selected subset of operating conditions, demonstrating that the turbine thrust is unaffected by high-frequency components in the in flow. Conclusions are drawn on the necessity to match both turbulence intensity and base flow frequency content in wind-tunnel studies if realistic results are to be obtained from small-scale studies.
1941-7012
Gambuzza, Stefano
1f5bfca9-d0e8-457a-ae45-2258412f2fdf
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Gambuzza, Stefano
1f5bfca9-d0e8-457a-ae45-2258412f2fdf
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052

Gambuzza, Stefano and Ganapathisubramani, Bharathram (2021) The effects of free-stream turbulence on the performance of a model wind turbine. Journal of Renewable and Sustainable Energy.

Record type: Article

Abstract

Free-stream turbulence characteristics play an important role in the mechanisms of power harvesting for wind turbines. Acquisitions of power and thrust from a model wind turbine of diameter 0:18m have been carried out in a wind tunnel for a wide range of turbulent base flows, with varying free-stream turbulence intensity in the range between 3% and 16% and integral time scale spanning from 0:1 to 10 times the turbine rotation period. The results demonstrate that power is significantly affected both by the inflow turbulence scales and its intensity, while thrust is scarcely affcted by free-stream turbulence. Fluctuations in the generated torques are also measured, with their behaviour dominated by the free-stream turbulence scale, and only moderately affected by turbulence intensity. The frequency response of thrust fluctuations has been measured for a selected subset of operating conditions, demonstrating that the turbine thrust is unaffected by high-frequency components in the in flow. Conclusions are drawn on the necessity to match both turbulence intensity and base flow frequency content in wind-tunnel studies if realistic results are to be obtained from small-scale studies.

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Accepted/In Press date: 10 March 2021
Published date: 29 March 2021

Identifiers

Local EPrints ID: 447762
URI: http://eprints.soton.ac.uk/id/eprint/447762
ISSN: 1941-7012
PURE UUID: 5ab8c4d8-fddc-42c9-9ecc-cdf7bbf553fa
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

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Date deposited: 19 Mar 2021 17:33
Last modified: 26 Nov 2021 02:56

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Contributors

Author: Stefano Gambuzza

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