Abstract:In this paper, stability of the wind turbine blade nonlinear aeroelastic system in the dynamic stall regime is investigated. The structural model consists of a typing blade section subjected to flap/lead-lag motion. The aerodynamic loads in the dynamic stall regime have been computed using the semi-empirical nonlinearity Onera model. To avoid errors introduced by the linearization assumptions, the non-linear time domain computations are conducted for time simulations to evaluate nonlinear aeroelastic behavior of this system. A parametric study on the flutter behavior of the system has been performed. The effects of the parameters like structural damping which have not been studied in most previous analyses is given in this paper.