Turbine blade vibration due to partial admission

Abstract A method is given for analyzing the vibrations of turbine blades during partial admission. The combined effects of shock loading as the blades enter and leave the arc of admission, and nozzle wake loading in the arc of admission are included. By separating these two effects, the dependence of blade stress on natural frequencies, running speed, number of nozzles, number of blades per row, number of blades per group and damping is illustrated. Apparatus for determining experimentally the exact nature of the steam loading acting on the blades is described.