HYDROTURBINE RUNNER BLADE LOCAL EXTENSION TO AVOID CAVITATION EROSION

摘要

The invention concerns a hydraulic turbine comprising a runner crown or a hub (1), possibly a band (2), and blades (3) fixed to said crown or hub, or between said band and said crown, and to be actuated in rotation around an axis of rotation, each blade comprising:- a leading edge (8) and a trailing edge (10),- at least one local extension (20) having a first contact surface fixed to the trailing edge of the blade (2), a second contact surface fixed to either said band (6) or said crown (4) and two lateral sides (24₁, 24₂) joining at a ridge line (22).