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All Journal Mekanika: Majalah Ilmiah Mekanika
Ladokun, Laniyi Laniran
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Hydrodynamic Performance Assessment of Straight and Helical Hydrokinetic Turbine Hydrofoil-Blade Sections in River Oyun, North-Central Nigeria Ladokun, Laniyi Laniran
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 2 (2024): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i2.92527

Abstract

The performance of lift-based hydrokinetic rotor turbines usually depends on the blade sections or hydrofoil profile. Different hydrofoil blade sections, having different profiles and geometries, give different coefficients of performance in different hydrodynamic settings. This study examined the influence of blade geometry on the power stage characterization of vertical axis crossflow hydrokinetic turbines under conditions of low river current velocity. Two turbines have been selected to characterize the power stage. Pre-developed straight-bladed National Advisory Committee for Aeronautics (NACA) 0021 hydrofoil blade sections and a Gorlov helical/curved NACA 0021 pattern were used in the hydrodynamic experimental characterization along River Oyun, Kwara State, North-Central Nigeria. The graphical ratio of the coefficient of performance, CP,which measures the efficiency of the turbine blade sections converting kinetic energy into mechanical energy, and the turbine blade Tip Speed Ratio (TSR), was used to analyze the hydrodynamic blade performance characterization. The peak CP values, the optimal TSR, the CP curve shape, and the stall regions from the CP-TSR chart were used to determine the hydrofoil with optimal performance.
Hydrodynamic Performance Evaluation of a Double Stage Savonius Turbine on River Ogun, South-Western Nigeria Babatunde, Moses Adeniyi; Ladokun, Laniyi Laniran; Oke, M A
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.104492

Abstract

This study evaluates the hydrodynamic performance of a double-stage Savonius hydrokinetic turbine with a rotor diameter of 0.3m, a rotor height of 0.6m, and a swept area of 0.18 m², designed for deployment in the River Ogun, Southwestern Nigeria. The objective is to assess the turbine's suitability for harnessing energy from low-head rivers. The methodology involved testing the turbine in a riverine environment at selected flow velocities and depths, evaluating its power coefficient (Cp), Tip Speed Ratio (TSR), and power output. The results show that the turbine achieves a maximum Cp of 0.321 at a TSR of 0.5 and a peak power output of 100.9 W at a flow velocity of 1.55 m/s and angular velocity of 5.26 rad/s, and with a cut-in speed of approximately 1.48 m/s. Across all test conditions, the average Cp was approximately 0.3013, indicating an energy conversion efficiency of about 30.1% relative to the total available kinetic power, which is 335.15 W. This result highlights the double-stage Savonius turbine’s capacity to extract energy under ultra-low head and low-velocity conditions efficiently and highlights the importance of optimizing turbine design and operating conditions for improved energy generation efficiency.
Co-Authors Babatunde, Moses Adeniyi Oke, M A