Study on the Characteristics of Blade Load of Wind Turbine under Variable Wind

Based on the aerodynamic theory of wind turbine,the aerodynamic loads calculation model of wind turbine blade was established according to wind shear,wind turbine structure and geometric parameters.Variable speed model was established based on the basic wind speed,the gradient wind speed,gustiness and fluctuating wind and applied to calculation model to count the speed aerodynamic load of blade under varying wind speed.Taking a MW wind power generator as an example,the numerical simulation of wind turbine have been worked out.The results show that,firstly,the aerodynamic loads of wind turbine are mainly located in the middle and tip of blade,and the load ups and downs with wind speed,but the change of aerodynamic loads of blade root is not obvious.Secondly,the load fluctuations of blade is more significant when the wind speed is high.The research contents of the paper provide loading conditions for structural design and dynamics analysis of blade.