LAPSE:2023.26187
Published Article
LAPSE:2023.26187
Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines
Marina Barbarić, Zvonimir Guzović
March 31, 2023
Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.
Keywords
diffuser augmented turbine, hydrokinetic turbine, hydropower, optimization based design, power augmentation, shrouded turbine
Suggested Citation
Barbarić M, Guzović Z. Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines. (2023). LAPSE:2023.26187
Author Affiliations
Barbarić M: Department of Energy, Power and Environmental Engineering, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, p.p. 102, 10002 Zagreb, Croatia
Guzović Z: Department of Energy, Power and Environmental Engineering, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, p.p. 102, 10002 Zagreb, Croatia
Journal Name
Energies
Volume
13
Issue
17
Article Number
E4560
Year
2020
Publication Date
2020-09-02
Published Version
ISSN
1996-1073
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PII: en13174560, Publication Type: Journal Article
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doi:10.3390/en13174560
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Mar 31, 2023
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