Reversible pump-turbines need to operate often at off-design operating conditions to
stabilize the electric grid. These operating conditions cause hydraulic instabilities due to the …

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 …

This study investigates an active control strategy to suppress the precessing vortex core
(PVC) and aims to extend the stable operation range of Francis turbine air model. Large …

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 …

Nonlinear energy sink (NES) is a device used for structural vibration reduction, which can
not only achieve targeted energy transfer, but also has many advantages such as wide …

Swirling flows often occur in nature and industrial applications. With an increase in swirl
intensity, such rotating flows are known to become unstable and undergo a sudden …

Vortices belong to the most important phenomena in fluid dynamics and play an essential
role in many engineering applications. They can act detrimentally by harnessing the flow …

The study elucidates the mechanisms involved in actively controlling vortex phenomena
within hydraulic turbines, particularly prevalent during partial load operations, leading to …

This work is devoted to a numerical study of the precessing vortex core (PVC) mitigation in a
Francis turbine air model. The approach utilized to suppress the PVC, injection of radial jets …

In the static and fatigue tests of full-scale aircraft structures, it is necessary to conduct air
tightness assessments on key components such as the fuel tank, cockpit, and fuselage …