The paper reviews recent research and development activities in the field of hydropower
technology. It covers emerging and advanced technologies to mitigate flow instabilities …

Hydropower is a clean and renewable source of energy which is widely used to generate
electric power and stabilize the power grid. It can respond quickly to any change in demand …

An experimental and theoretical investigation of the flow at the outlet of a Francis turbine
runner is carried out in order to elucidate the causes of a sudden drop in the draft tube …

Cavitating vortex rope at part load (PL) condition at lower values of the Thoma number (r)
induces severe pressure fluctuation and efficiency reduction in a Francis turbine, which …

A grid-connected integrated system incorporating cascade hydropower, solar/photovoltaic,
and wind power requires a hydraulic turbine to operate frequently under off-design …

The variable demand of the energy market requires that hydraulic turbines operate at
variable conditions, which includes regimes far from the best efficiency point. The vortex …

Abstract Rotating Vortex Rope (RVR) resulting from flow instabilities inside draft tube affects
the hydraulic turbine's efficiency and wear. Among the passive and active RVR mitigation …

If large pressure fluctuation is observed in the draft tube of a Francis turbine at part-load
operation, we have generally called it draft-tube-surge. As occurrence of this phenomenon …

Abstract Rotating Vortex Rope (RVR) has been a matter of focus for years due to the major
effects on hydraulic turbine's efficiency. The exact procedure of RVR formation is still vague …

Francis Turbine when operated at part load suffers flow instability due to swirl component of
the velocity attached with exiting flow downstream the runner. The swirling flow at runner …