Abstract
In this study, the performance of a new wind turbine design derived from a conventional Savonius turbine is optimized by numerical simulation. The new design consists of three blades without passage between them (closed center). The coupling between the CFD codes (ANSYS Fluent) and the optimizer (OPAL) is used through an automatic procedure in-house codes, as documented, for example, in Thévenin et al.’s Optimization and Computational Fluid Dynamics (2008). A single-objective function (output power coefficient, Cp) is considered as the target of the optimization technique and the shape of the blade as an optimization parameter and relies on evolutionary algorithms. An optimal solution can emerge from this optimization study. By comparison between regular design (semi-cylindrical shape blades) and the optimal configuration, a considerable improvement (up to 7.13% at λ = 0.7) of the optimal configuration performance can be obtained in this manner.
Highlights
Due to the deep energy crisis in the world, research studies and development activities in the field of renewable energy, especially wind energy, have considerably increased during the last few years in many countries
In the current article, the optimum blade shape will depend on automatic optimization as an initial step toward deep intensive optimization of the two considerable factors affects the performance of a modified Savonius rotor
This study numerically optimizes the blade shape of the design based on the conventional Savonius turbine but involving three blades without a passage in between
Summary
Due to the deep energy crisis in the world, research studies and development activities in the field of renewable energy, especially wind energy, have considerably increased during the last few years in many countries. Savonius turbines (Figure 1) and derived configurations could be a very good solution for such conditions. This is the purpose of the present study. The theoretical and experimental results concerning the performance of Savonius turbines in these previous publications have indicated that such turbines are interesting for some specific applications but show very low efficiency. Several design improvements have been introduced to enhance the efficiency of the Savonius rotor (Huda et al, 1992; Menet and Nachida, 2004; Saha and Rajkumar, 2006; Irabu and Roy, 2007; Menet, 2007; Hassan et al, 2021; Mohamed et al, 2021)
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