Vortex is one of typical structures of the unsteady flow inside the hydroturbines, leading to
significant pressure fluctuation, prominent vibration of the units, and fatigue of turbine …

Energy is unarguably the key factor for today's economic and social development within
nations. Electricity as one of many energy forms is a critical input to developing countries in …

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 …

Francis turbine working at off-design operating condition experiences high swirling flow at
the runner outlet. In the present study, a high head model Francis turbine was …

The dynamics of the rotating vortex taking place in the discharge ring of a Francis turbine for
partial flow rate operating conditions and cavitation free conditions is studied by carrying out …

We perform a numerical analysis of the decelerated swirling flow into the discharge cone of
a model Francis turbine operated at variable discharge and constant head, using an …

Penetration of solar and wind energy into the grid network has raised the concern for grid
stability which is generally balanced by operating the hydropower plants over a wide range …

The draft tube of a hydraulic turbine is the component where the flow exiting the runner is
decelerated, thereby converting the excess of kinetic energy into static pressure. In the case …

We introduce and validate a novel mathematical model for computing the radial profiles of
both axial and circumferential velocity components, respectively, of the swirling flow exiting …

The flow in the off-design operation of a Francis turbine may lead to the formation of spiral
vortex breakdowns in the draft tube, a diffuser installed after the runner. The spiral vortex …