Abstract
Hydrokinetic turbines are new technologies. Among hydrokinetic turbine types, the cross-flow Darrieus hydrokinetic turbine is most suitable for power generation due to its high efficiency and RPM. However, this turbine exhibits poor starting torque. In this study, the effects of angle of attack (AoA) on the performance of the turbine have been analyzed numerically to improve the starting behaviors and performance under different operating conditions. Two positive AoAs (4°, 8°), two negative (−4°, −8°) AoAs, and one neutral value (0°) of AoA were considered. A Darrieus hydrokinetic turbine with straight symmetrical S-1046 profile blades was selected for the study. The constant flow velocity of water in the channel was considered as 0.5m/s. The study concluded that the hydrokinetic turbine with positive AoA experiences increment in the power and torque coefficient. However, beyond a certain limit of AoA, power coefficient has been found to decrease with the increase of AoA.
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