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 …

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 …

The rotating vortex rope (RVR) is normally formed at part load operating conditions, which
develops flow instability in the draft tube (DT) cone of a Francis turbine. The detrimental …

The part load operation of a Francis turbine generally develops a rotating vortex rope (RVR)
in the draft tube, generating flow instabilities and pressure pulsations. The present work …

Dam and powerhouse operation sustainability is a major concern from the hydraulic
engineering perspective. Powerhouse operation is one of the main sources of vibrations in …

Due to the increasing share of new renewable energies like wind and solar in the
generation of electricity the need for power regulation and energy storage is becoming of …

This paper presents a preliminary numerical investigation on the design of the runner cone
for a small turbine test rig under development at IIT Roorkee, India. The test rig is designed …

Operating Francis turbines at partial discharge is often hindered by the development of the
helical vortex (so-called vortex rope) downstream the runner, in the draft tube cone. The …

In this study, the vibration effects of a vortex that occurred in high-head Francis turbines and
an alternator are examined. The vortex effect, which directly affects the efficiency and the …

The decelerated swirling flow in the draft tube cone of hydraulic turbines (especially turbines
with fixed blades) is responsible for self-induced instabilities which generates pressure …