Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.11851/12030
Title: | Mitigating Cavitation Effects on Francis Turbine Performance: a Two-Phase Flow Analysis | Authors: | Altintas, B. Ayli, E. Celebioglu, K. Aradag, S. Tascioglu, Y. |
Keywords: | Cavitation Cfd Experiment Francis Turbine Multi-Phase |
Publisher: | Elsevier Ltd | Abstract: | Due to their ability to operate over a wide range of flow rates and generate high power, Francis turbines are the most widely used of hydroturbine type. Hydraulic turbines, are designed for specific flow and head conditions tailored to site conditions. However, Francis turbines can also be operated outside of design conditions due to varying flow and head values. Operation outside of design conditions can lead to cavitation. In this study, single-phase steady-state an alyses were conducted initially to examine cavitation in detail, followed by two-phase transient analyses. The results obtained from these analyses were compared to determine the cavitation characteristics of the designed turbine. The steady-state simulation results indicate the occurrence of cavitation, including traveling bubble and draft tube cavitation, under overload operating conditions. However, these cavitation characteristics are not observed in the two-phase transient simulation results under the same operating conditions. Additionally, the turbine efficiency is predicted to be higher in the transient simulation results. This is attributed to the frozen rotor interface used in the steady-state simulations, which over predicts flow irregularities. The reduced flow irregularities in the transient results have resulted in lower cavitation and losses, leading to higher predicted turbine efficiency. © 2024 Elsevier Ltd | URI: | https://doi.org/10.1016/j.oceaneng.2024.120018 https://hdl.handle.net/20.500.11851/12030 |
ISSN: | 0029-8018 |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection |
Show full item record
CORE Recommender
Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.