Method and device for resisting wear from particle containing water on an impeller.

Abstract

A method and a device for counteracting wear from particle bearing drive water in a runner (4) in a water turbine (1), the runner (4) comprising a runner hub (16) and a vane (18), or a runner hub (16), a vane (18) and a runner band (20), the vane (18) being attached to the runner hub (16) in a first attachment area (22) and to the runner band (20) in a second attachment area (24), and where the method comprises: routing a supply channel (40) for water cleaner than the drive water to at least the first attachment area (22) or the second attachment area (24) and leading water cleaner than the drive water to flow over at least a portion of the vane (18) surface.