Analysis of pressure pulsations during the fast transition of a pump turbine from pumping to generating mode

HYPERBOLE Symposium 2017 (HYdropower plants PERformance and flexiBle Operation towards Lean integration of new renewable Energies)

Braun, O.^1 ; Ruchonnet, N.^2

Andritz AG, Pumps, Graz, Austria^1

Andritz Hydro AG, Turbine Physics, Vevey, Switzerland^2

关键词: Off-design operating conditions;    Predictive capabilities;    Pressure pulsation;    Reduced scale models;    Reversible pump-turbine;    Stationary frame;    Test rig configuration;    Wavelet transformations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/813/1/012017/pdf
DOI  :  10.1088/1742-6596/813/1/012017

来源: IOP

【 摘 要 】

Variable speed motor-generators based on full size converter offer new options for operation of reversible pump-turbines. To explore the challenges related with this new technology a specific test rig configuration is developed to perform such transition with a PT reduced scale model. Transition from pump to turbine and vice versa are performed with various guide vanes opening and transition time. In order to validate the predictive capabilities of state-of-the-art CFD methods to predict the flow field under fast transition through off design operating conditions, pressure pulsations are measured as well in the rotating as in the stationary frame. Since some phenomena are likely to occur only for short periods of time, wavelet transformation methods are used to compare the pressure pulsations occurring during the transitions for different times of transition ranging from 20s to 4s.