Aeroservoelastic Pitch Control of Stall-Induced Flap/Lag Flutter of Wind Turbine Blade Section

Figure 3

Flap and lag displacements for from 5 m s⁻¹ to 20 m s⁻¹ at intervals of 5 m s⁻¹ and critical flutter velocities of the section at given rotating speeds.

(a) Flap displacements for from 5 m s⁻¹ to 20 m s⁻¹ at intervals of 5 m s⁻¹

(b) Lag displacements for from 5 m s⁻¹ to 20 m s⁻¹ at intervals of 5 m s⁻¹

(c) The critical flutter velocities versus rotating speeds from 30 rpm to 120 rpm at intervals of 15 rpm