PAT – Transition Regolation Start&Stop


Research activities

  • Numerical simulation of centrifugal pump power-off transition process and flyaway transition process.

  • Multi-objective optimization of a PAT for microgrid system.

  • Experimental tests on PAT in both pump and turbine mode.

  • Time-frequency, wavelet analysis and Omega vortex method will be used to study the pressure pulsation characteristics of PAT to identify both strong and weak vortex structures


In order to reduce greenhouse gas emissions, countries around the world have been developing hydropower as a mature renewable energy technology. At the same time, small hydropower stations have become a focus of attention due to their environmental friendliness, low operating costs, and low reservoir costs. In practical applications, pumps as turbines (PAT) are widely used to reduce equipment costs. Among pumps with different specific speeds, centrifugal pumps return on investment due to the wider ranger of flow rate, lower manufacturing cost and easier maintenance. The purpose of this study is to capture the morphology of vortices and unsteadyness using FFT, Wavelet and Omega vortex identification technique at part load, Shut-Down process and runaway transition.


FacilityPump Facility

Mesh ToolsICEM


Post Processing Tools – Wavelet, Ω-method, ANSYS





Prof. Giorgio Pavesi

Prof. Giorgio Pavesi

Head of the TES Laboratories


ORCID page

Zhang Chenying

Eng. Chenying Zhang