The synchronous pressure surge effect is a critical phenomenon occurring in Francis
turbines operating at part load conditions. In this regime, pressure fluctuations are …

This paper reports a detailed investigation of the interaction between a wall-bounded
precessing vortex core (PVC) occurring in swirling flows after vortex breakdown and a wall …

The paper investigates the unstable behavior of a precessing vortex core in a diffuser
behind a rotating swirler. The studies were carried out by experimental methods using a …

The unsteady shape variation of a cavitating spiral vortex is experimentally studied pointing
out the repetitive creation of vortex ring (or vortex loop). To generate the spiral vortex …

Some results of experimental studies of the vortex-core reconnection phenomenon in the
flowthrough duct of a combined-flow turbine were presented. The studies were performed on …

The paper presents a study of the instability of the precessing vortex core in the model of the
draft tube of a hydraulic turbine. The study was carried out using numerical modeling using …

In the present study, we report on the results of an experimental study of pressure pulsations
in the flow duct of a medium-scale hydrodynamic bench with Francis turbine. In various …

A problem on origin of the instability of a conical helical vortex, which manifests itself in the
distortion of the original shape, the convergence of the spiral turns, and the formation of loop …

Представлены результаты экспериментальных исследований явления перезамыкания
вихревого жгута в проточном тракте радиально-осевой гидротурбины. Исследования …

The flow in the conical part of the hydroturbine draft tube undergoes various instabilities due
to deceleration and flow swirling at off-design operation points. In particular, the precessing …