Aerodynamic Analysis of a Wind-Turbine Rotor Affected by Pitch Unbalance

Francesco Castellani, Abdelgalil Eltayesh, Matteo Becchetti and Antonio Segalini
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Francesco Castellani: Department of Engineering, University of Perugia, via G. Duranti 93, 06125 Perugia, Italy
Abdelgalil Eltayesh: Mechanical Engineering Department, Benha Faculty of Engineering, Benha University, Benha 13512, Egypt
Matteo Becchetti: Department of Engineering, University of Perugia, via G. Duranti 93, 06125 Perugia, Italy
Antonio Segalini: KTH Royal Institute of Technology, FLOW, STandUP for Wind, Osquars Backe 18, 10044 Stockholm, Sweden

Energies, 2021, vol. 14, issue 3, 1-16

Abstract: The aerodynamics of a rotor with pitch imbalance has been investigated experimentally and numerically in the present work. The comparison of mean velocity and turbulence intensity in the balanced and unbalanced cases indicated that a pitch imbalance modifies both the mean velocity and the turbulent activity; the latter is weakly increased by the imbalance. Spectral analysis indicated that the dynamics of the wake is also affected by the pitch imbalance since the tip vortices loose strength and disorganise more quickly than in the balanced case. The pitch imbalance has, however, a detrimental effect on the power coefficient and it affects the thrust coefficient as well. Only the blade affected by the imbalance shows significant modifications of the applied load, while the other blades operate with the same loading conditions.

Keywords: rotor aerodynamics; pitch imbalance; wind-tunnel test; CFD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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