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Volume 13
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10.3390/en13123129
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Article

Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load †

by
Raluca G. Iovănel
1,*,
Georgiana Dunca
2,
Diana M. Bucur
2 and
Michel J. Cervantes
1
1
Division of Fluid and Experimental Mechanics, Luleå University of Technology, 971 87 Luleå, Sweden
2
Department of Hydraulics, Hydraulic Equipment and Environmental Engineering, Politehnica University of Bucharest, 060042 Bucharest, Romania
*
Author to whom correspondence should be addressed.
†
This paper is an extended version of our paper published in 2019, IOP Conf. Ser.: Earth Environ. Sci, Vol 240, Issue 2, doi: 10.1088/1755-1315/240/2/022046.
Energies 2020, 13(12), 3129; https://doi.org/10.3390/en13123129
Submission received: 23 April 2020 / Revised: 6 June 2020 / Accepted: 11 June 2020 / Published: 16 June 2020
(This article belongs to the Special Issue State-of the-Art, Challenges and Perspectives in Hydraulic Machines and Systems)
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Abstract

The aim of this study is to develop a reliable numerical model that provides additional information to experimental measurements and contributes to a better exploitation of hydraulic turbines during transient operation. The paper presents a numerical analysis of the flow inside a Kaplan turbine model operated at a fixed runner blade angle during load variation from the best efficiency point (BEP) to part load (PL) operation. A mesh displacement is defined in order to model the closure of the guide vanes. Two different types of inlet boundary conditions are tested for the transient numerical simulations: linear flow rate variation (InletFlow) and constant total pressure (InletTotalPressure). A time step analysis is performed and the influence of the time discretization over the fluctuating quantities is discussed. Velocity measurements at the corresponding operating points are available to validate the simulation. Spectrogram plots of the pressure signals show the times of appearance of the plunging and rotating modes of the rotating vortex rope (RVR) and the stagnation region developed around the centerline of the draft tube is captured.
Keywords: Kaplan turbine; transient operation; mesh displacement; rotating vortex rope Kaplan turbine; transient operation; mesh displacement; rotating vortex rope

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MDPI and ACS Style

Iovănel, R.G.; Dunca, G.; Bucur, D.M.; Cervantes, M.J. Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load. Energies 2020, 13, 3129. https://doi.org/10.3390/en13123129

AMA Style

Iovănel RG, Dunca G, Bucur DM, Cervantes MJ. Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load. Energies. 2020; 13(12):3129. https://doi.org/10.3390/en13123129

Chicago/Turabian Style

Iovănel, Raluca G., Georgiana Dunca, Diana M. Bucur, and Michel J. Cervantes. 2020. "Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load" Energies 13, no. 12: 3129. https://doi.org/10.3390/en13123129

APA Style

Iovănel, R. G., Dunca, G., Bucur, D. M., & Cervantes, M. J. (2020). Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load. Energies, 13(12), 3129. https://doi.org/10.3390/en13123129

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