Abstract
The development of pumped storage plants presents quicken tendency since the deregulation of energy market, for balancing the unstable grid caused by electricity generated by renewable energy. Whilst pumped storage plants are increasingly operating at off-design conditions in order to meet the requirement of electrical grid, therefore performance of unit at off-design conditions has become more important. In this work, three dimensional unsteady calculations were carried out for simulating pump turbine load rejection period based on the dynamic sliding mesh method and turbulent model of detached eddy simulation, also weakly compressible fluid was considered. The results was analyzed in both time domain and frequency domain to study the internal flow field characteristics, while flow field evolution in vaneless space between guide vane and runner was also investigated, reasons of vortex rope formation and characteristics of vortex rope in draft tube were studied.
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