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Wind and Structures Volume 32, Number 3, March 2021 , pages 267-281 DOI: https://doi.org/10.12989/was.2021.32.3.267 |
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Flutter study of flapwise bend-twist coupled composite wind turbine blades |
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Touraj Farsadi and Altan Kayran
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| Abstract | ||
| Bending-twisting coupling induced in big composite wind turbine blades is one of the passive control mechanisms which is exploited to mitigate loads incurred due to deformation of the blades. In the present study, flutter characteristics of bend-twist coupled blades, designed for load alleviation in wind turbine systems, are investigated by time-domain analysis. For this purpose, a baseline full GFRP blade, a bend-twist coupled full GFRP blade, and a hybrid GFRP and CFRP bend-twist coupled blade is designed for load reduction purpose for a 5 MW wind turbine model that is set up in the wind turbine multi-body dynamic code PHATAS. For the study of flutter characteristics of the blades, an over-speed analysis of the wind turbine system is performed without using any blade control and applying slowly increasing wind velocity. A detailed procedure of obtaining the flutter wind and rotational speeds from the time responses of the rotational speed of the rotor, flapwise and torsional deformation of the blade tip, and angle of attack and lift coefficient of the tip section of the blade is explained. Results show that flutter wind and rotational speeds of bend-twist coupled blades are lower than the flutter wind and rotational speeds of the baseline blade mainly due to the kinematic coupling between the bending and torsional deformation in bend-twist coupled blades. | ||
| Key Words | ||
| wind turbine; composite blade; bend-twist couple; flutter analysis | ||
| Address | ||
| Touraj Farsadi:Adana Alparslan Turkes Science and Technology University, Department of Aerospace Engineering, Turkey Altan Kayran:Middle East Technical University, Department of Aerospace Engineering, RUZGEM, Turkey | ||