This report describes a hydraulic model study conducted for INDECO of Minneapolis, Minnesota. The objective of the model study was to first determine whether vortices detrimental to hydroturbine operation would occur at the plant intakes and, second, to propose methods to eliminate these vortices if they do occur. A 1:11. 7 scale model of the intakes to the 5 MW Rapidan Hydroelectric Station was built and tested. The model included the two intakes, almost all four of the intake bays, portions of the dam, the left river bank, and upstream river bed. The model showed the formation of a large separation zone off the right pier, and, hence, the formation of a large, persistent air-entraining vortex in intake bay No. 1. The separation zone of the pier second to the right was not as severe, but intermittent trash-pulling vortices did form in intake bay No. 2. To alleviate the vortex problem, flow improvements were recommended.
|Original language||English (US)|
|Journal||Project Report - University of Minnesota, St. Anthony Falls Hydraulic Laboratory|
|State||Published - Jan 1 1983|