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 …

Competitive electricity prices and reduced profit margins have forced hydraulic turbines to
operate under critical conditions. The demand for extended operating ranges and the high …

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 …

When a Francis turbine operates over an extended range of regimes far from the best
efficiency point, the formation of a helical precessing vortex rope can lead to reduced …

Hydropower refers to energy conversion from flowing water into electricity. Due to water
recycling by the Sun, hydropower is widely accepted as a form of renewable energy. A …

This review addresses the current state of research into active control and suppression of
vortex rope in hydroturbines under off-design operating conditions. Only active control …

Abstract Development of rotating vortex rope (RVR) at part load (PL) operation is a source of
pressure fluctuations in draft tube and power swings, which may lead to runner failure under …

Hydropower plants provide an asset over other renewables of production flexibility. Away
from the turbine design point; detrimental off-load instabilities may compromise the power …

Hydraulic turbines are increasingly used to regulate the electrical grid. They thus have to
operate more often at off-design conditions where instabilities may develop leading to large …