To investigate the unstable behaviour of reversible pump-turbines (RPT), a CFD analysis of a low specific-speed RPT is performed from stable operating conditions up to zero-discharge condition for a fixed guide vanes opening. The time-frequency approach identified the onset of two correlated rotating stall phenomena in the runner and in the guide vanes (62% and 38% of the runner rotation frequency respectively), starting to develop at different flow rates in the turbine brake operating zone.
Unsteady numerical analysis of the S-shape characteristic of a reversible pump-turbine operating in generating mode
Giacomo Zanetti
;Giovanna Cavazzini;
2022
Abstract
To investigate the unstable behaviour of reversible pump-turbines (RPT), a CFD analysis of a low specific-speed RPT is performed from stable operating conditions up to zero-discharge condition for a fixed guide vanes opening. The time-frequency approach identified the onset of two correlated rotating stall phenomena in the runner and in the guide vanes (62% and 38% of the runner rotation frequency respectively), starting to develop at different flow rates in the turbine brake operating zone.
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