Experimental and computational investigation of hydrokinetic turbine

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Anıl Güneş Master Thesis.pdf

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2022-8

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Güneş, Anıl

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The answer to the increasing amount of energy consumption, mostly in carbon-based energy sources can be found in water and through the wind. The investigation of a special drag-based cross-flow hydrokinetic turbine (referred to as a Vertical Axis Wind Turbine for wind energy applications) called Savonius, is the main purpose of this study. Both experimentally and computationally studying this high self-starting ability turbine will open up the way to small-size energy production with very small water and wind inflow velocities. This study aims to compare the computational results with experimental studies in a water channel, using three different turbine blade base geometries. The semi-circular blade geometry resulted in a good agreement between experimental and computational studies, where both peak around unity tip speed ratio and for maximum power coefficient the relative error is 7.8%. The computational results underestimate the performance compared to experimental result within a margin of 0.03 power coefficient, up to unity tip speed ratio. For lambda > 1 the difference in results of the power coefficient increase up to 1.0. For another base geometry with maximum chamber location near the blade tip, the results of CFD are in close agreement with experimental data for a tip speed ratio interval of 1.1 - 1.7, and deviate outside this range.

Subject Keywords

cross-flow hydrokinetic turbine, Savonius, water tunnel experiments, CFD

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https://hdl.handle.net/11511/99507

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. Güneş, “Experimental and computational investigation of hydrokinetic turbine,” M.S. - Master of Science, Middle East Technical University, 2022.