Francis turbines are most widely used in hydropower due to their characteristics which
include a fast response and wide time-scale operation. The vortex rope inside Francis …

In the plain river network area, the constructed axial-flow pumping station is used to
generate electricity by reversing as turbine when the upstream water is abundant, which can …

An experimental investigation of the cavitating turbulent flow in a simplified hydraulic turbine
was carried out to examine flow features in a wide range of speed and discharge conditions …

We report on the experimental study of a precessing vortex core (PVC) in an air model of a
Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in …

In this paper, we introduce a novel passive control method to mitigate the unsteadiness
effects associated to the swirling flows with self-induced instabilities. The control method …

Cavitation vortex rope widely occurs in hydraulic machinery, leading to the decrease in
performance characteristic and increase in pressure fluctuation. The objective of this study …

Pressure fluctuations caused by helical vortex rope in the draft tube is one of the main
reasons for the instability of Francis turbines. Previous studies showed that drilling holes on …

The structure of pomelo peel arouses research interest in recent years because of the
outstanding damping and energy dissipating performance of the pomelo peel. Researchers …

Variable speed regulation represents an effective means to ensure the efficient operation of
the diffuser mixed flow pump as turbine (DMFPAT). This paper employed computational fluid …

Hydropower takes on many tasks such as peak regulation and frequency modulation in the
power system. In the actual operation process of the hydro‐turbine governing system, there …