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Wind Turbines
Published in V. Dakshina Murty, Turbomachinery, 2018
The Savonius wind turbine, invented by the Finnish engineer Sigurd Johannes Savonius in 1922, is a vertical axis turbine that consists of two half-cylindrical drums arranged in the shape of an “S” (see Figures 12.6 and 12.7), such that the convex and concave sides of the half cylinders are facing the wind at one time. Since the drag on the concave side is higher than on the convex side, the rotor will experience a net torque and rotate. The power coefficient for such rotors is relatively small and they have high starting torque. They also work with lower tip speed to blade speed ratios. In spite of these less attractive factors, Savonius rotors are quite popular due to their simplicity of construction.
Wind Turbines
Published in Vaughn Nelson, Kenneth Starcher, Wind Energy, 2018
Vaughn Nelson, Kenneth Starcher
A Savonius rotor (Figure 5.5) is not strictly a drag device, but it has the same characteristic of large blade area to intercept area. This means more material for construction and problems arising from force at high wind speeds even if the rotor is not turning. An advantage of the Savonius wind turbine is the ease of construction.
Optimization of Savonius wind turbine blades based on perturbed stochastic fractal search algorithm and Kriging surrogate model
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Over the past few decades, the world’s population expansion has caused a marked rise in energy consumption. With the energy crisis and environmental pollution, people have realized the importance of sustainable development and environmental protection. Renewable energy has become an important means to solve the problems of energy crisis and environmental pollution (Wong et al. 2018) and renewable energy sources have gained wide attention in recent years (Derse and Yılmaz 2022). As a renewable energy source, wind energy has attracted great attention in recent decades (Kouloumpis, Sobolewski, and Yan 2020). The vertical-axis wind turbine is a kind of important wind energy capture equipment and is favored by scholars in recent years (Dewan, Gautam, and Goyal 2021), because it is simpler in structure, cheaper to build (Tahani et al. 2017), and has more unique all-around properties and compactness (Wong et al. 2018). The Savonius turbine is a typical vertical-axis wind turbine which has a good starting ability (Zhang and Qu 2021) and is suitable for low wind speed areas (Xu et al. 2022). Even so, the energy capture efficiency of the Savonius wind turbine is relatively low, which limits its popularization and application (Ricci et al. 2016).