Variable-Pitch Vertical Axis Wind Turbine with Straight Blades

One of the widely known forms of Vertical-Axis wind turbine (VAWT) is the Darrieus rotor with the straight blades (H-type Darrieus). Vertical-axis wind turbines (VAWT) do not suffer from frequent wind direction changes, but the use of H-type Darrieus wind turbines is virtually prohibited by their inherent inability to self-start. For this reason, we designed a vertical-axis wind turbine with the variable-pitch angle mechanism, which consists of straight blades and Four-bar linkage. This video is wind tunnel test of the Variable-Pitch Vertical Axis Wind Turbine. The angle of attack for the airfoil is better able to maintain the optimum angle by the variable-pitch angle mechanism, and improvement of the performance of VAWT is to be expected.

For more detail of research, refer to the following paper.
"Takahiro KIWATA, Tatsuro YAMADA, Tetsuyoshi KITA, Shinei TAKATA, et al., Performance of a Vertical Axis Wind Turbine with Variable-Pitch Straight Blades utilizing a Linkage Mechanism, Journal of Environment and Engineering, Vol. 5 (2010) , No.1, pp.213-225."
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