Abstract The present study introduces the concept of mitigating pressure pulsations in a hydro-turbine draft tube. refers to using an adjustable guide vane system adjustability relates its ability rotate around axis. test rig for experimental is high-head Francis model turbine. Three sets vanes are distributed evenly circumferentially Each consists two hydrofoils. upper hydrofoil can move lower...

Mixing patterns inside a simulated flat bottom digester were imaged using the non-invasive techniques of computer automated radioactive particle tracking (CARPT) and computed tomography (CT). Mixing/agitation was provided using gas (air) recirculation at three different flow rates (Q(g)) of 28.32, 56.64 and 84.96 l/h, corresponding to superficial gas velocities of 0.025, 0.05 and 0.075 cm/s, re...

Hydropower plays a key role in the actual energy market due to its fast response and regulation capacity. In that way, hydraulic turbines are increasingly demanded to work at off-design conditions, where complex flow patterns and cavitation appear, especially in Francis turbines. The draft tube cavitation surge is a hydraulic phenomenon that appears in Francis turbines below and above its Best ...