Efficiency Assessment for Rehabilitated Francis Turbines Using URANS Simulations

Due to the large number of aging hydraulic turbines in North America, rehabilitation is a growing market as these have low efficiency compared modern ones. Computational Fluid Dynamics identifies components with poor performance. The models often used industry are based on individually analyzing sub-components turbine instead full simulations due computational and time limitations. An industrial case has shown that such analyses may lead underestimating increases by modifying stay vane. unsteady simulation proposes simulate all simultaneously assess this augmentation vane rehabilitation. developed methodology evaluate increase flow two rehabilitated modifications. Comparison model tests shows accuracy simulations. However, imprecision predicting tests. Further works should consider use more complex modeling methods measure