Design verification of a reversible Deriaz turbine with increased efficiency and improved fish friendly characteristics

I. Kassanos, V. Alexopoulos and J. Anagnostopoulos

Applied Energy, 2024, vol. 372, issue C, No S0306261924010869

Abstract: The growing significance of renewable energy sources within the electricity market, along with the need to tap into lower head and capacity sites towards achieving recent sustainability goals, has highlighted the need for the development of hydro turbines and reversible machinery that exhibit enhanced performance across a broad operating envelope. This need is further compounded by the rising importance and strictness of environmental regulations, which necessitates the design of turbomachinery with improved environmental characteristics. In this context, Deriaz turbomachines emerge as a promising solution due to their numerous potential benefits. Notably, they can function as reversible pump-turbines, with remarkable hydraulic efficiency across a wide spectrum of operational loads. In this study, a numerical approach aimed at optimizing the design of a Deriaz turbine, in order to achieve high energy efficiency and improved fish-friendly behaviour in both pump and turbine operational modes, is introduced. Using a previously developed versatile design tool, coupled to numerical simulation and optimization tools, a new Deriaz reversible pump-turbine has been designed. Through a rigorous design process, numerous geometry variations have been analysed with the aim of improving the operational characteristics and environmental performance of the machine. The final geometry selected through the optimization procedure, was manufactured, and tested in both turbine and pump operating modes. By comparing the numerical to the experimental results, a remarkable agreement was observed particularly in turbine operation, thereby validating the design methodology and highlighting the efficacy of Deriaz turbines as a means to accomplish net-zero emissions goals.

Keywords: Numerical design; Deriaz turbine; Reversible turbine; Fish-friendly; Laboratory measurements (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123703

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