Enhancement Attempts for a Three-Bladed Savonius Turbine Performance

Abstract

In this work, the performance of a new wind turbine design derived from a conventional Savonius turbine is investigated by numerical simulations. The new design consists of three blades without passage between them (closed center). All unsteady computations (which mean computational fluid dynamics as well in the next sections) presented in the current work depend on a commercial software ANSYS Fluent 19. In particular, the blade geometry, the influence of a deflecting plate, and the influence of mobile parts on the returning plate have been investigated in detail. Since first results were partly disappointing for the turbine with a deflector but very interesting for the turbine with an opening blade, these same properties have also been investigated for the classical Savonius turbine. By comparison between both, an optimal solution can emerge from this first study for these designs. The results indicated that the opening blade design improved the performance by 25.9% at λ = 0.7; however, the deflecting plate reduces the performance along the operating range.

Influence of deflectors on indoor airflow velocity distribution under natural ventilation conditions

“…This model is well-suited for forecasting indoor airflow distribution and has demonstrated its effectiveness, particularly under mixed convection conditions (Ling et al, 2015). In this study, the SIMPLE (semi-implicit method for pressure dependent equations) pressure-velocity coupling algorithm is used (Fan et al, 2022;Liu et al, 2022;Mohamed et al, 2022).…”

Performance Rating and Flow Analysis of an Experimental Airborne Drag-Type VAWT Employing Rotating Mesh

“…A number of other publications [12][13][14][15][16][17][18][19][20][21] have also focused on improving the performance of either Savonius, Daerius, or hybrid VAWTs using different approaches in design. However, it is important to note that while these turbines are practical for harnessing wind energy at low altitudes, the total energy produced is relatively low.…”

“…Although it requires significant computational resources, this method is widely regarded as the most precise for forecasting flow in multiple moving reference frames. Therefore, it is commonly employed in such CFD models of airborne rotors [16,38]. In the sliding mesh methodology, the adjacent zones move relative to each other along the mesh interface, facilitating rotation without the need for cell alignment.…”

Performance enhancement of Savonius wind turbine through partially deformable blades

“…Deformable blades have also been explored to reduce returning blade drag. Some researchers have proposed rigidly deformable blades that open when advancing and close when returning, resulting in a 25.9% improvement in performance [9]. Self-expandable blades that passively expand relative to the turbine angle have demonstrated the potential to increase the torque coefficient by 90.6% [10].…”