Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2016-53
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research articles
23 Dec 2016
Review status
A revision of this discussion paper was accepted for the journal Wind Energy Science (WES) and is expected to appear here in due course.
Aeroelastic Stability of Idling Wind Turbines
Kai Wang1, Vasilis A. Riziotis2, and Spyros G. Voutsinas2 1China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Rd, Wuhan, China
2School of Mechanical Engineering, National Technical University of Athens, GR15780 Athens, Greece
Abstract. Wind turbine rotors in idling operation mode can experience high angles of attack, within the post stall region that are capable of triggering stall-induced vibrations. In the present paper, rotor stability in slow idling operation is assessed on the basis of non-linear time domain and linear eigenvalue analyses. Analysis is performed for a 10 MW conceptual wind turbine designed by DTU. First, the flow conditions that are likely to favour stall induced instabilities are identified through non-linear time domain aeroelastic simulations. Next, for the above specified conditions, eigenvalue stability simulations are performed aiming at identifying the low damped modes of the turbine. The eigenvalue stability results are evaluated through computations of the work of the aerodynamic forces under imposed harmonic motion following the shape and frequency of the various modes. Eigenvalue analysis indicates that the asymmetric and symmetric out-of-plane modes have the lowest damping. The results of the eigenvalue analysis agree well with those of the non-linear work analysis and the time domain analysis.

Citation: Wang, K., Riziotis, V. A., and Voutsinas, S. G.: Aeroelastic Stability of Idling Wind Turbines, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2016-53, in review, 2016.
Kai Wang et al.
Kai Wang et al.
Kai Wang et al.

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Short summary
In the paper, rotor stability in slow idling operation is assessed on the basis of non-linear time domain and linear eigenvalue analyses. A consistent and computationally cost effective modelling environment has been presented for the analysis of parked or idling rotors. The analysis showed that the lowest damped modes of a 10 MW idling rotor are the out-of-plane ones (symmetric and asymmetric).
In the paper, rotor stability in slow idling operation is assessed on the basis of non-linear...
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