Structural And Aeroelastic Stability Analysis Methods Of Wind Turbine Rotor

19721212

Abstract:
Aeroelastic phenomena of a wind turbine include stall-induced vibrations and classical flutters. The classical flutter occurs due to coalescences between bending mode and torsion mode. It is typical aeroelastic instabillity of aircraft wings.Unlike the classical flutter, the stall-induced vibration is the instability in lead-lag mode due to negative aerodynamic dampings. In the present study, the three degree of freedom aeroelastic model of a wind turbine blade is introduced to characterize and analyze its aeroelastic phenomena. The numerical results show that the aeroelastic stability of flap-lag motion is more unstable that that of flap-pitch motion and the aeroelastic characteristics of lea-lag motion can become unstable as wind speed increases.