Enhancing H-Darrieus tidal turbine performance through Gurney flap implementation: a numerical investigation.
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| Title: | Enhancing H-Darrieus tidal turbine performance through Gurney flap implementation: a numerical investigation. |
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| Authors: | Abdel-Naby, Ahmed A1 (AUTHOR), Nawar, Omnia M1 (AUTHOR), Lotfy, Eslam R1,2 (AUTHOR) eslam.reda@alexu.edu.eg |
| Source: | Sādhanā: Academy Proceedings in Engineering Sciences. Sep2025, Vol. 50 Issue 3, p1-12. 12p. |
| Subjects: | Tidal power, Turbines, Numerical analysis, Torque measurements, Mechanical efficiency, Simulation software |
| Abstract: | Tidal energy stands out as a promising solution for reducing pollution originating from fossil fuels. Unlike wind energy, tidal oscillation current is predictable. Moreover, the energy density derived from tidal resources surpasses that of wind energy due to high density of water compared to air. This highlights the applicability of tidal turbines with high power density. Various types of turbines can extract tidal power, with the Darrieus turbine, a vertical axis turbine being notable. In the current study, a 2D numerical setup for a Darrieus turbine was developed using ANSYS Fluent 17.2. The objective is to assess the impact of introducing Gurney flap on the performance characteristics of the H-Darrieus water turbine. Mesh and time independence tests were performed. The 2D numerical model was validated against experimental data from the literature, resulting in a commendable agreement. Six angles and five lengths of Gurney flap, with a thickness of 0.5% of the chord length were examined. The Gurney flap resulted in an approximate 25% increase in the torque coefficient at a tip speed ratio (TSR) of 0.5. Furthermore, the highest-performing Gurney flap configuration (45° angle and 1% length) was examined on blades with 0° and 5° pitch angles. Overall, the Gurney flap enhances turbine performance and shifts its optimal operating range to lower TSRs. Notably, the 0° pitch angle blade with a Gurney flap achieved the highest torque coefficient, reaching 0.13 at a TSR of 0.5. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Tidal energy stands out as a promising solution for reducing pollution originating from fossil fuels. Unlike wind energy, tidal oscillation current is predictable. Moreover, the energy density derived from tidal resources surpasses that of wind energy due to high density of water compared to air. This highlights the applicability of tidal turbines with high power density. Various types of turbines can extract tidal power, with the Darrieus turbine, a vertical axis turbine being notable. In the current study, a 2D numerical setup for a Darrieus turbine was developed using ANSYS Fluent 17.2. The objective is to assess the impact of introducing Gurney flap on the performance characteristics of the H-Darrieus water turbine. Mesh and time independence tests were performed. The 2D numerical model was validated against experimental data from the literature, resulting in a commendable agreement. Six angles and five lengths of Gurney flap, with a thickness of 0.5% of the chord length were examined. The Gurney flap resulted in an approximate 25% increase in the torque coefficient at a tip speed ratio (TSR) of 0.5. Furthermore, the highest-performing Gurney flap configuration (45° angle and 1% length) was examined on blades with 0° and 5° pitch angles. Overall, the Gurney flap enhances turbine performance and shifts its optimal operating range to lower TSRs. Notably, the 0° pitch angle blade with a Gurney flap achieved the highest torque coefficient, reaching 0.13 at a TSR of 0.5. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 02562499 |
| DOI: | 10.1007/s12046-025-02765-3 |
