Author(s): Azin Amini; E. Mazzocchi; Giovanni De Cesare

Linked Author(s):

Keywords: Intake/outlet structure; pumped-storage facility; vortex formation; head loss coefficient; sediment scouring; hybrid modeling

Abstract: Within the framework of the Snowy 2.0 large-scale pumped-storage facility project in Australia, hybrid experimental and numerical modeling of Tantangara (upper reservoir) and Talbingo (lower reservoir) intake/outlet structure were carried out. The goal of the hybrid physical-numerical models was to verify the hydraulic design of the intake/outlet structures. The risk of vortex formation, velocity patterns in critical sections and the head loss coefficient were assessed under different generation and pumping scenarios. The experimental model was constructed on a scale of 1:25 while the numerical model was developed using Flow 3D software. The flow behavior in both pumping and generation modes was shown to be symmetric. The discharge is uniformly distributed between central and lateral openings, especially when the structure is functioning in inlet mode. For both operation modes the velocities are compliant with the design requirements. The design of anti-vortex measures was optimized using the experimental model. They were manufactured at a high level of detail and tested for both intakes. Vortex formation was re-assessed, and the measures were proven effective in reducing the vortices’ intensity. Overall, the hybrid experimental-numerical modeling approach for the intakes proved to be a valuable tool in gaining understanding of hydraulic behavior of these structures. It also contributed significantly to enhancing their design, particularly in preventing undesired vortex formation.

DOI: https://doi.org/10.3929/ethz-b-000675921

Year: 2024