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Transactions of FAMENA, Vol. 49 No. 3, 2025.

Izvorni znanstveni članak

https://doi.org/10.21278/TOF.493053723

Numerical Shape Optimisation of an Isolated Hydraulic Diffuser

Nicolás Herrera-Sandoval orcid id orcid.org/0009-0007-6057-5470 ; Tecnológico Nacional de México, campus Morelia, Morelia, Michoacán, Mexico
Daniel Molinero-Hernández orcid id orcid.org/0000-0001-6666-721X ; Universidad Michoacana de Sán Nicolás de Hidalgo, Mechanical Engineering Faculty, Morelia, Michoacán, Mexico
Sergio Galván-González orcid id orcid.org/0000-0002-6925-707X ; Universidad Michoacana de Sán Nicolás de Hidalgo, Mechanical Engineering Faculty, Morelia, Michoacán, Mexico *
Cristóbal Camacho-Arriaga orcid id orcid.org/0000-0002-2766-2763 ; Tecnológico Nacional de México, campus Morelia, Morelia, Michoacán, Mexico
Carlos Rubio-Maya orcid id orcid.org/0000-0002-7676-9145 ; Universidad Michoacana de Sán Nicolás de Hidalgo, Mechanical Engineering Faculty, Morelia, Michoacán, Mexico
Jesús Pacheco-Ibarra ; Universidad Michoacana de Sán Nicolás de Hidalgo, Mechanical Engineering Faculty, Morelia, Michoacán, Mexico

* Dopisni autor.

Puni tekst: engleski pdf 2.806 Kb

str. 33-48

preuzimanja: 296

citiraj

Sažetak

In the draft tube of hydraulic turbines, the remaining kinetic energy of the runner is transformed into pressure mainly due to its diffuser geometry. Recognizing that the divergence section reduces flow velocity and the straight duct promotes flow uniformity, determining the exact relation between these sections for a fixed space in a diffuser is crucial to improving the overall performance of the diffuser. To find this relation, we designed an automatic optimisation process by coupling computational fluid dynamics (CFD) software to a distributed genetic algorithm that manipulated a single diffuser parameter to minimise its energy losses. By using this method, the best geometries were determined by employing a low-fidelity CFD model, but the fluid flow analysis was done on a high-fidelity one. The results show that the precise relation between the divergence and the duct for a defined inlet velocity profile in a diffuser can minimise the energy losses, recovering up to 90% of the mean static pressure.

Ključne riječi

diffuser; CFD, draft tube; numerical optimisation; genetic algorithm

Hrčak ID:

335913

URI

https://hrcak.srce.hr/335913

Datum izdavanja:

19.9.2025.

Posjeta: 1.295 *