Abstract
In case of the hydro turbine operated departing from the optimum condition, vortex ropes usually occur in the draft tube, and consequently generate pressure oscillations. In most conditions, cavitation occurred in the center of the rope and turned it to be a multiphase cavitating rope. This kind of unsteady flow phenomenon is believed to be harmful for hydropower stations. This paper designs a kind of vortex-control grooves and make a numerical simulation in a Francis hydro turbine using the partially averaged Navier-Stokes method. The behavior of the cavitation rope and the induced pressure oscillations under several operation conditions with and without the grooves will be analyzed based on the calculation results.
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