The flutter problem associated with the blades of a class of vertical-axis wind turbines called Darrieus is studied in detail. The spinning blade is supposed to be initially curved in a particular shape characterized by a state of pure tension at the blade cross section. From this equilibrium position a three-dimensional linear perturbation pattern is superimposed to determine the dynamic aeroelastic stability of the blade in the presence of free wind speed by means of the Floquet-Lyapunov theory for periodic systems.

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Journal Journal of Propulsion and Power
Nitzsche, F. (1994). Dynamic aeroelastic stability of vertical-axis wind turbines under constant wind velocity. Journal of Propulsion and Power, 10(3), 348–355. doi:10.2514/3.23763