Blade design aspects

Blade design is split into aerodynamic and structural design. The challenge is to design rotor blades for different applications (stall/active stall/pitch regulated wind turbines and/or constant/variable speed) which are optimised in weight and aerodynamic performance. The usage of advanced design tools, production technology and material choice are the dominating parameters. A weight/swept area ration in the order 1-1,5 can be achieved with epoxy resin/glass fibre material up to a rotor diameter of 62 m. Condition monitoring of the accelerations of stall blade has been implemented in the control system of the wind turbines.