Patent ID: 7802960

Claim:
A device for reducing noise and vibrations in a suction pipe in a reaction-type hydropower turbine at low operating ranges, where the suction pipe comprises at least one nozzle for injection of a water through the nozzles into the suction pipe, where each nozzle is arranged at an angle γ between 5° and 80° relative to a horizontal plane perpendicular to the longitudinal axis of an inlet of the suction pipe, wherein -each nozzle is at an angle β between 20° and 70° relative to a horizontally defined tangent at the point of intersection between each nozzle and the suction pipe; wherein an amount of water injected is zero at the optimal operating point for the turbine, while for lower operating points the amount of water injected will increase to 10% of the amount of water passing the turbine at the operating point concerned.