Numerical Analysis of Savonius Vertical Axis Wind Turbine with Dimpled Blades
01 Jan 2021-pp 209-223
TL;DR: In this paper, the performance improvement of Savonius vertical axis wind turbine, commonly utilized to harness low wind speed potentials, has been investigated with an endplate and dimpled blade profile.
Abstract: To solve the increasing power demand of the growing population without increasing carbon footprint, energy efficiency for renewable sources needs to be improved. This paper focuses on the performance improvement of Savonius vertical axis wind turbine, commonly utilized to harness low wind speed potentials. Such turbines can find excellent use in places where the wind speed is not sufficient for introducing traditional horizontal axis wind turbines. To develop a better aerodynamic design that can reduce drag, dimples introduced on the blade profile. The effect of endplate also studied for improving the performance of the turbine. The design and comparative analysis performed with an endplate and dimpled blade profile. Computational fluid dynamics simulations carried out for understanding the performance of the turbine with dimples and endplates when subjected to low incoming wind velocity. Comparative analysis performed between the proposed design with the baseline design, i.e. with endplates, without endplates and with dimples on blades to show how it affects the efficiency of the turbine.
References
More filters
Book•
01 Jun 1995
TL;DR: This chapter discusses the development of the Finite Volume Method for Diffusion Problems, a method for solving pressure-Velocity Coupling in Steady Flows problems, and its applications.
Abstract: *Introduction. *Conservation Laws of Fluid Motion and Boundary Conditions. *Turbulence and its Modelling. *The Finite Volume Method for Diffusion Problems. *The Finite Volume Method for Convection-Diffusion Problems. *Solution Algorithms for Pressure-Velocity Coupling in Steady Flows. *Solution of Discretised Equations. *The Finite Volume Method for Unsteady Flows. *Implementation of Boundary Conditions. *Advanced topics and applications. Appendices. References. Index.
7,412 citations
TL;DR: In this paper, different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters, it was found that, the two blades rotor is more efficient than three and four ones.
Abstract: For solving the world energy problem and the bad effect of conventional sources of energy on environment, great attention allover the world is paid towards the use of renewable energy sources. Special interest is paid towards wind energy because of its competitively.
Savonius rotor is a vertical axis wind turbine which is characterized as cheaper, simpler in construction and low speed turbine. This makes it suitable for generating mechanical energy in many countries especially in Egypt.
In this work different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters. It was found that, the two blades rotor is more efficient than three and four ones. The rotor with end plates gives higher efficiency than those of without end plates. Double stage rotors have higher performance compared to single stage rotors. The rotors without overlap ratio (β) are better in operation than those with overlap. The results show also that the power coefficient increases with rising the aspect ratio (α). The conclusions from the measurements of the static torque for each rotor at different wind speeds verify the above summarized results of this work.
231 citations
TL;DR: In this article, the aerodynamic performance and flow fields of Savonius rotors at various overlap ratios have been investigated by measuring the pressure distributions on the blades and by visualizing the flow fields in and around the rotors with and without rotation.
205 citations
TL;DR: In this paper, a wind tunnel test was made on a number of Savonius rotor configurations in wind speeds of 6-9 m/s with variable variables including blade aspect ratio, blade overlap and gap and the effects of adding end extensions, end plates and shielding.
199 citations
Patent•
[...]
15 May 2006
TL;DR: In this article, the authors proposed a vertical axis wind turbine with a linear trailing edge with a non-linear, and preferably helical, surface configuration, which allows the blades to provide both a rotational force and a positive or negative lift component.
Abstract: A vertical axis wind turbine wherein the blades of the rotor section of the wind turbine comprise at least sections wherein the blades have a non-linear configuration in the “z” axis. In a preferred embodiment, the blades of the rotor section have a linear trailing edge with a non-linear, and preferably helical, surface configuration. This particular design allows the blades to provide both a rotational force and a positive or negative lift component. Further, the blades define an open area in the center of the rotor section through which air flow can pass in order to create a vertical vortex of air. As such, a more efficient vertical axis wind turbine provided.
106 citations