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Hydraulic turbine diffuser optimization using adjoint solver
Pham, Jakub ; Štefan, David (oponent) ; Rudolf, Pavel (vedoucí práce)
This work deals with the shape optimization of the draft tube of a swirl generator that mimics the runner of a Francis turbine. The optimization is based on the use of the adjoint solver in ANSYS Fluent. The primary objective was to suppress the vortex rope in off-design regimes. An iterative optimization methodology for the adjoint solver was established. The objective function for the adjoint solver was selected with the goal of minimizing swirl around the diffuser axis. A new diffuser design was presented and analyzed, after which a comparison was made between vortex rope behaviour and flow field characteristics inside the new and old diffuser designs. It was found that shape optimization had not resulted in any significant improvement in vortex rope behaviour, with the energy of the vortex rope being only transferred further away from the hub of the swirl generator. Recommendations for future methods of vortex rope mitigation were made at the conclusion of this work.

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