Abstract
Pumped storage unit as the most efficient energy storage equipment, it makes a great contribution to the development of renewable energy. The operating stability of pump turbine affects economical and safe operation of pumped storage plant directly, hence this study focuses on the transient process of pump turbine load rejection. Detached eddy simulation is adopted as turbulence model and dynamic mesh technique is used to achieve continuous guide vane closure. Internal fluid characteristics are presented based on the numerical analysis of inter-blade vortex and force of runner blades. The results show that:(1) Inter-blade vortex can be divided into two developing stages according to its location, which corresponds to the first and second half of guide vane closure respectively. (2) The incidence angle is the original reason that causes vortex in runner passage, which further development occupies the whole flow passage under the influence from centrifugal force and the interaction with the previous water. (3) The force distribution is aligned with the vortex zone, and the axial thrust keeps a downward tendency.
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