The FFA dynamic stall model. The Beddoes-Leishman dynamic stall model modified for lead-lag oscillations

摘要

For calculations of the dynamics of wind turbines the inclusion of a dynamic stall model is necessary in order to obtain reliable results at high winds. For blade vibrations in the lead-lag motion the velocity relative to the blade will vary in time. In the present paper modifications to the Beddoes-Leishman model is presented in order to improve the model for calculations of cases with a varying relative velocity. Comparisons with measurements are also shown and the influence on the calculated aerodynamic damping by the modifications are investigated.