Rotating vortex rope formation and mitigation in draft tube of hydro turbines–A review from experimental perspective
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 …
electric power and stabilize the power grid. It can respond quickly to any change in demand …
A review on remedial attempts to counteract the power generation compromise from draft tubes of hydropower plants
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 …
from the turbine design point; detrimental off-load instabilities may compromise the power …
Investigation of cavitating vortex rope instabilities and its suppression inside a Francis turbine model with Thoma number variation
MA Shahzer, Y Cho, MM Shamsuddeen, JH Kim - Physics of Fluids, 2023 - pubs.aip.org
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 …
induces severe pressure fluctuation and efficiency reduction in a Francis turbine, which …
Optimization of axial water injection to mitigate the Rotating Vortex Rope in a Francis turbine
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 …
the hydraulic turbine's efficiency and wear. Among the passive and active RVR mitigation …
Suppression of vortex rope formation and pressure fluctuation using anti-swirl fins in a Francis turbine model at part load condition with cavitation inception point
MA Shahzer, SJ Kim, Y Cho, JH Kim - Physics of Fluids, 2022 - pubs.aip.org
Vortex rope formation at part load (PL) with cavitation inception causes pressure fluctuations
inside the draft tube (DT) of a Francis turbine which may fail the turbine due to resonance …
inside the draft tube (DT) of a Francis turbine which may fail the turbine due to resonance …
Investigation on combined air and water injection in Francis turbine draft tube to reduce vortex rope effects
M Mohammadi, E Hajidavalloo… - Journal of Fluids …, 2019 - asmedigitalcollection.asme.org
In this paper, the effect of water, air, and their combined injection from two different injection
points is studied in order to reduce vorticity effects in a draft tube of prototype turbine working …
points is studied in order to reduce vorticity effects in a draft tube of prototype turbine working …
Experimental study of mitigation of a spiral vortex breakdown at high Reynolds number under an adverse pressure gradient
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 …
vortex breakdowns in the draft tube, a diffuser installed after the runner. The spiral vortex …
Aspects of vortex breakdown phenomenon in hydraulic turbines
FA Masoodi, R Goyal - Experimental Thermal and Fluid Science, 2024 - Elsevier
Operational flexibility of hydraulic turbines is impeded by the vortex breakdown
phenomenon. The phenomenon, a consequence of instability in vortical flows in general …
phenomenon. The phenomenon, a consequence of instability in vortical flows in general …
Linear global stability analysis of a transient swirling flow leading to the formation of a helical precessing vortex breakdown in a straight diffuser
Vortex breakdown occurs in highly swirling flows in various engineering applications, such
as hydraulic turbines working in either high-load or part-load conditions, leading to pressure …
as hydraulic turbines working in either high-load or part-load conditions, leading to pressure …
Francis turbine draft tube troubleshooting during operational conditions using CFD analysis
Hydropower plant vibrations due to pressure fluctuations and their troubleshooting methods
are some of the most challenging issues in power plant operation and maintenance. This …
are some of the most challenging issues in power plant operation and maintenance. This …