Improving the efficiency of a Savonius wind turbine by designing a set of deflector plates with a metamodel-based optimization approach

Recent Development in the Design of Wind Deflectors for Vertical Axis Wind Turbine: A Review

“…Offshore wind power is harvested by either bottom fixed or floating wind turbines that share a cumulative contribution of 0.3% to total global electrical generation (current global capacity of 23 GW) [25]. On the other hand, urban areas are marked by comparatively high turbulence, fluctuation, and variability in the wind direction and speed [1]. These drastic changes are experienced due to large buildings and other urban structures, rendering large HAWTs unsuitable for power generation under such conditions [26].…”

“…Conversely, a vertical axis wind turbine (VAWT) is the most popular and effective device for electrical power generation from the kinetic energy of wind in urban built-up environments. These turbines are cross-flow, drag-driven wind turbines, and their power generation coefficient varies from 4% to 24% as reported in the literature [1,23,29,30]. The VAWTs are easy to manufacture and install, cheaper in price, produce less noise pollution, and can run in omni-directional winds.…”

“…VAWT performance can be increased by several methods, as summarized in Table 1. The electrical power generation coefficient of the vertical axis wind turbines is up to 24%; however, a 30% efficiency increase can be achieved by optimizing the existing VAWT designs [1]. Initiatives have been taken by many researchers to improve power generation efficiency; these attempts incorporate modifications in the blade geometry design or the configuration of VAWT devices [34].…”

“…When a wind deflector was installed in the configuration, the performance could be improved at the lower value of the tip-speed ratio. The important parameter to find was the suitable position for the deflector, which had a significant effect on wind turbine performance [1,82]. The twin-turbine configuration presented in Figure 11 was tested with different positions of the wind deflector, and it was concluded that the wind turbine achieved better performance if the deflector was placed closer to the turbine rotor [81].…”

“…Increasing concerns about environmental pollution and degradation, climate change, global warming, and sustainable socio-economic development are among the reasons for the advancement and development of renewable energy systems [1,2]. Renewable energy demand is likely to increase four-to five-fold with population growth, as predicted in the World Energy Council (WEC) Scenarios to the year 2050.…”