The following are the different layouts regarding the overlapping of Savonius blades (or buckets). The third layout is the most aerodynamic-efficient layout. It is also the same for helical Savonius wind turbine.
In layout 3, reducing the gap "b" leads to excessive noise, turbulence, and vibrations, while large gap "b" leads to reducing the effective drag area of the advancing blade. Therefore, the gap should be optimized.
In layout 3, reducing the gap "b" leads to excessive noise, turbulence, and vibrations, while large gap "b" leads to reducing the effective drag area of the advancing blade. Therefore, the gap should be optimized.
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