This review addresses the current state of research into active control and suppression of
vortex rope in hydroturbines under off-design operating conditions. Only active control …

Cavitation is a quasi-periodic process, and its non-stationarity leads to increasingly complex
flow field structures. On the other hand, characterizing the flow field with greater precision …

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 …

The complex and diverse structural forms make it impossible to define universal shape
coefficients for large-span roof structures, which usually need to be obtained by wind tunnel …

The precessing vortex core (PVC), also known as vortex rope, in a draft tube of a Francis-99
hydro turbine is investigated. The goal is to increase our comprehension of the root of the …

Because a pump-turbine mainly undertakes the role of energy conversion and pumped
storage in the field of hydropower engineering, the complex transition process and frequent …

The decelerating swirling flow in the draft tube of hydraulic turbines at part load conditions
often results in a self-induced instability known as vortex rope. This phenomenon is …

In hydro turbines, the draft tube vortex rope is one of the most crucial impact factors causing
pressure pulsation and vibration. It is affected by operating conditions due to differences in …

This paper presents an active method to control the pressure fluctuations induced by the
rotating vortex rope (RVR) in a Francis hydro turbine model under part load conditions. The …

We study the flow in a model Francis-99 draft tube for partial load conditions using Large-
eddy simulation. The swirl is produced by the runner rotating with a constant angular …