Design of a Novel Vertical Axis Water Turbine With Retractable Arc-Type Blades
A drag-type vertical axis water turbine, like Savonius, experiences negative torque in the returning half cycle, which limits the power efficiency. A new drag-type turbine, which consists of several retractable blades that are mounted on a drum, is designed and analyzed in this paper. The open angle of each blade is controlled to achieve a high output performance. Kinematics analysis demonstrated that the returning blades can fit to the drum and negative torques can then be considerably deduced. Two-dimensional computational fluid dynamics simulations were performed to give detailed information about the output of the turbine. The simulation results show that the maximum averaged power coefficient is 0.2595, obtained at a flow coefficient of 0.4.
Document Type: Research Article
Publication date: July 1, 2013
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