Publication: Power optimization of 2d cylindrical deflector with attached splitters and barrier on savonius turbine through taguchi method
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Date
2024-06-01
Authors
Mohamad Hafizul Fikri, Mahizam
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Abstract
Vertical axis wind turbines (VAWTs) have a vertical rotor axis, designed to
generate electricity from wind energy. The primary reason for the low efficiency of
Savonius turbines is the negative torque produced by the returning blade. Savonius
turbines rotate perpendicular to the wind, relying on drag forces between the
advancing and returning blades for efficiency. Thus, the study proposes a novel
design of a cylindrical deflector with splitters and a barrier to offset the flow field to
the returning blades. This optimization is achieved through a comprehensive
approach involving computational fluid dynamics (CFD) simulations and the
Taguchi optimization method. CFD is employed to assess the power performance of
the turbine, serving as a crucial input for the subsequent Taguchi optimization
analysis. The Taguchi method is then utilized to identify the optimal combination of
specified characteristics, including the length of the barrier (Ls/D), the barrier
attachment angle (α), and the geometric shape of the cylinder deflector with a splitter
and a barrier. The tip speed ratio (λ) for this study is fixed at the λ = 1. The simulations
and additive model show that the optimal combination involves a cylindrical
deflector with dual wake splitters positioned at the top and middle. The deflector is
parallel to the flow, and a barrier at its bottom is perpendicular to the flow. The
optimal configuration has Ls/D ratio of 0.9 and a barrier attachment angle (α) of 10°.
This ideal combination yields a power coefficient of 0.459, indicating a 61%
performance increase compared to the 0.284 power coefficient of the double wake
splitter deflector.