Numerical Study of a Francis Turbine over Wide Operating Range: Some Practical Aspects of Verification

Chirag Trivedi, Igor Iliev and Ole Gunnar Dahlhaug
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Chirag Trivedi: Waterpower Laboratory, NTNU—Norwegian University of Science and Technology, 7491 Trondheim, Norway
Igor Iliev: Waterpower Laboratory, NTNU—Norwegian University of Science and Technology, 7491 Trondheim, Norway
Ole Gunnar Dahlhaug: Waterpower Laboratory, NTNU—Norwegian University of Science and Technology, 7491 Trondheim, Norway

Sustainability, 2020, vol. 12, issue 10, 1-10

Abstract: Hydropower plays an essential role in maintaining energy flexibility. Modern designs focus on sustainability and robustness using different numerical tools. Automatic optimization of the turbines is widely used, including low, mini and micro head turbines. The numerical techniques are not always foolproof in the absence of experimental data, and hence accurate verification is a key component of automatic optimization processes. This work aims to investigate the newly designed Francis runner for flexible operation. Unsteady simulations at 80 operating points of the turbine were conducted. The numerical model consisted of 16 million nodes of hexahedral mesh. A SAS-SST (scale adaptive simulation-shear stress transport) model was enabled for resolving/modeling the turbulent flow. The selected time-step size was equivalent to one-degree angular rotation of the runner. Global parameters, such as efficiency, torque, head and flow rate were considered for proper verification and validation. (1) A complete hill diagram of the turbine was prepared and verified with the reference case. (2) The relative error in hydraulic efficiency was computed and the over trend was studied. This allowed us to investigate the consistency of the numerical model under extreme operating conditions, far away from the best efficiency point. (3) Unsteady fluctuations of runner output torque were studied to identify unstable regions and magnitude of torque oscillations.

Keywords: cfd; energy; Francis turbine; hydropower; verification (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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