SPLIT FRANCIS TURBINE RUNNER

摘要

A split runner for a Francis turbine has runner segments that are adapted to be joined together along confronting surface portions thereof to form a composite runner having a crown, a band and a plurality of blades extending between the crown and the band. The confronting surface portions of the runner segments are located only along portions of the crown and portions of the band, and the confronting surface portions of the runner segments are located in between and spaced from adjacent blades of the composite runner. Since the confronting surface portions are located only along portions of the crown and portions of the band, none of the blades are split eliminating the need to weld together blades during formation of the composite runner. Accordingly, the composite runner does not have weld joints formed in the blades which are highly stressed operating parts of the runner.