Abstract Design and performance analysis of hydraulic turbines are two very crucial aspects
of any hydro power project which ensure economical and efficient functioning of these …

Operational flexibility of hydraulic turbines is impeded by the vortex breakdown
phenomenon. The phenomenon, a consequence of instability in vortical flows in general …

This work is focused on reduction of swirling in cases from hydraulic machinery and, thus,
mitigation of instabilities associated with swirling flow. We study this problem analytically …

At part load conditions, Francis turbines are subject to the emergence of a hydrodynamic
instability in their draft tube, referred to as precessing vortex rope. It induces pressure …

The flow characteristics of the draft tube of a Francis turbine have a significant influence on
turbine stability. Numerical simulations were performed for a Francis turbine under three …

Pressure fluctuations induced by a vortex rope are the major causes of hydraulic turbine
vibration in partial load operating conditions. Hence, an effective control strategy should be …

This article presents future trends in research using microbiological methods to intensify
bioprocesses for biogas production. The pretreatment by combinations of physical and …

The self-oscillation of the cavitating vortices is one of the dangerous phenomena of
hydraulic turbine operation near full-load conditions. This work is an attempt to generalize …

Recent theoretical and numerical studies predict the Moffatt eddies near the interface-wall
intersection in a two-fluid flow. The current work provides the first experimental evidence of …

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 …