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Influence of Icing on the Modal Behavior of Wind Turbine Blades
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. (Computer Aided Design)ORCID iD: 0000-0001-8216-9464
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Number of Authors: 3
2016 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 9, no 11, 862Article in journal (Refereed) Published
Abstract [en]

Wind turbines installed in cold climate sites accumulate ice on their structures. Icing of the rotor blades reduces turbine power output and increases loads, vibrations, noise, and safety risks due to the potential ice throw. Ice accumulation increases the mass distribution of the blade, while changes in the aerofoil shapes affect its aerodynamic behavior. Thus, the structural and aerodynamic changes due to icing affect the modal behavior of wind turbine blades. In this study, aeroelastic equations of the wind turbine blade vibrations are derived to analyze modal behavior of the Tjaereborg 2 MW wind turbine blade with ice. Structural vibrations of the blade are coupled with a Beddoes-Leishman unsteady attached flow aerodynamics model and the resulting aeroelastic equations are analyzed using the finite element method (FEM). A linearly increasing ice mass distribution is considered from the blade root to half-length and thereafter constant ice mass distribution to the blade tip, as defined by Germanischer Lloyd (GL) for the certification of wind turbines. Both structural and aerodynamic properties of the iced blades are evaluated and used to determine their influence on aeroelastic natural frequencies and damping factors. Blade natural frequencies reduce with ice mass and the amount of reduction in frequencies depends on how the ice mass is distributed along the blade length; but the reduction in damping factors depends on the ice shape. The variations in the natural frequencies of the iced blades with wind velocities are negligible; however, the damping factors change with wind velocity and become negative at some wind velocities. This study shows that the aerodynamic changes in the iced blade can cause violent vibrations within the operating wind velocity range of this turbine.

Place, publisher, year, edition, pages
2016. Vol. 9, no 11, 862
Keyword [en]
wind turbine blade; icing; natural frequency; damping
National Category
Applied Mechanics
Research subject
Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-59951DOI: 10.3390/en9110862ScopusID: 2-s2.0-84994344839OAI: oai:DiVA.org:ltu-59951DiVA: diva2:1040031
Projects
Wind power in cold climates
Funder
Swedish Energy Agency
Note

Validerad; 2016; Nivå 2; 2016-11-15 (andbra)

Available from: 2016-10-26 Created: 2016-10-26 Last updated: 2016-11-20Bibliographically approved

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Gantasala, SudhakarLuneno, Jean-ClaudeAidanpää, Jan-Olov
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