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In Guide Vanes (GV) of Francis turbines, a portion of the pressure head of water converts into velocity head. This causes high acceleration of the flow in GV before reaching the runner. Furthermore, GVs are accompanied with a small clearance gap at both ends to adjust the opening angle based on various operating conditions. In the case of sediment affected power plants, the hard fine particles mixed in water erode the connecting ends due to horse-shoe vortices. This erosion together with the head cover deflection due to water pressure increases the size of the gap. Due to the adjacent pressure and suction sides in GV, the flow passes through the gap from high pressure side to low pressure or suction side. This leakage flow disturbs the main flow in the suction side, which can be observed in the form of a vortex filament. Depending upon the GV profile and opening angle, the vortex can have different characteristics. This study uses numerical and experimental techniques to study the potential effects of the leakage flow in overall performances of the turbine. The experiment is done to measure the velocity field around GV using Particle Image Velocimetry (PIV) technique on a GV cascade rig. The GV in this rig corresponds to 1:1 scale model of 4.1 MW Francis turbine, with the chord length of 142 mm and span height of 97 mm. Similarly, 14 pre

The numerical and experimental investigation of erosion induced leakage flow through guide vanes of Francis turbine