Hydraulic Model Studies of the Reservoir Inlet-Outlet Structure for Horse Mesa Pump-Storage Unit Salt River Project, Arizona.

摘要

Hydraulic model studies were performed to assure satisfactory flow conditions through the reservoir inlet-outlet structure for a pump-storage unit at Horse Mesa Dam, Ariz. The studies were considered necessary because of unsymmetrical approach flow caused by the penstock configuration. The main purpose for the studies was to develop a design to provide a uniform velocity distribution at the trashrack. Uniform velocity distribution would eliminate any chance of forming strong vortex shedding and ensure a trashrack free from the danger of fatigue failure. The model was at a 1:24 scale and included the inlet-outlet structure, a rectangular-to-circular transition, and the penstock down to the spiral case. Velocity distribution and head loss measurements were made for the penstock and inlet-outlet structure. Two vertical walls were placed in the structure to improve the horizontal velocity distribution at the trashrack position. A low-velocity area was removed by making the floor of the structure nondivergent. The structure was then lengthened to restore the initial trashrack area. (Author)