RUNNER FOR FRANCIS TYPE HYDRAULIC TURBINE

摘要

There is disclosed a runner (10) for a Francis-type hydraulic turbine where each runner blade (13) has a outlet edge (16) comprising a deflected edge portion (110). The deflected edge portion (110) is located adjacent to the junction or attachment point (B) of the outlet edge (16) to the band (11 ) of the runner (10) to define a stress reducing tip extension portion (130) of t he blade (13) adjacent the band (11). This tip extension portion (130) reduces stress concentration adjacent where the outlet edge (16) joins the runner band (11).