Method for manufacturing a stay ring bearing stationary guide vanes for a nongated turbine

摘要

A method for manufacturing stay rings for a family of hydraulic turbine installations is disclosed. The stay ring comprises a plurality of stay vanes axially extending between two concentric ring members. Stay vanes are formed from flat plates and aligned circumferentially on the rings with radially outer leading edges presenting an intake angle acceptable for any turbine installation within a predetermined family of turbine installations. The vanes are sized such that their length measured from the leading edge to a trailing edge is such that the vane presents a discharge angle equal to a predetermined minimum discharge angle for the family of turbine installations for a given turbine installation. A desired discharge angle corresponding with a desired power output is predetermined and the trailing edges of the stay vanes are trimmed an amount sufficient for the stay vanes to present the desired discharge angle.