Vortex breakdown in discharge cone of the Francis Turbine

Hydraulic turbines are usually operating at high efficiencies around 90%. It is possible to increase the efficiency by preventing flow characteristics such as failure, cavitation and vortex rope in draft tube. In some cases, partial loads or overloads, pressure pulsations would occur These undesired events damage components of turbine that also causes decrease. To eliminate these artifacts, it decided design a new component. Vortex Preventing Element, which designed structures fluctuations, located inlet Computational Fluid Dynamics analyses performed for different designs having several stage numbers elements. The preliminary results showed one element creates more uniform tube increases about 3%. Since studies progress, could be said can handle phenomena effects Francis turbines.