ROTOR BLADE FOR A WATER TURBINE, IN PARTICULAR FOR A TIDAL POWER STATION, AND METHOD FOR OPERATING SAME

摘要

The invention concerns a rotor blade for a water turbine with a hydrodynamic profile, to which a suction side and a pressure side are associated, comprising a plurality of overflow channels, which are arranged in the hydrodynamic profile and create a hydraulic connection between the suction side and the pressure side and to which a valve arrangement is associated respectively. The invention is characterised in that the valve arrangement is closed below a preset load limit threshold for the rotor blade and is opened above the load limit threshold, whereas every overflow channel with the valve arrangement in the open position reduces the power coefficient and/or the thrust coefficient of the rotor blade with respect to the closed position.