Hydraulic Model Investigation of Turbine-Approach Flow: Five-In-One Dam Hydroelectric Installation, Cedar Rapids, Iowa

摘要

A 1:26-scale, undistorted, hydraulic model was used to identify and develop corrective measures for deficiencies in the turbine-approach flows for the three-unit pit turbines which will be installed in the Cedar Rapids Five-In-One-Dam. Various flow-turning vanes with different depths and spacings were employed at pier noses of the turbine approach-flow bays in order to correct nonuniform turbine approach-flow distributions that were found under the as-designed conditions. The optimum vane configurations that would provide acceptably uniform turbine-approach flows were then obtained for each bay by trial and error.