Stresses in a Hydraulic Turbine Stay Ring

Abstract

This paper describes a method of analysis of the stresses in a hydraulic turbine stay ring which includes the effect of the bending moment applied to the stay vanes by the forces on the ring due to the membrane load of the spiral case, the pressure on the face of the ring, and the head cover load. In most cases the bending stresses in the stay vanes, previously neglected, are shown to be of substantial magnitude. These bending stresses can be reduced by proper positioning of the stay vanes within the stay ring structure.