A Numerical Study on a Vertical-Axis Wind Turbine with Inclined Arms

Agostino De Marco, Domenico P. Coiro Domenico Cucco and Fabrizio Nicolosi, University of Naples Federico II, 30 June 2014

This work focuses on a particular type of vertical-axis wind turbine, in which a number of inclined arms with airfoil-shaped cross-sections are mounted to connect the principal blades to their hub. While the majority of the known studies on vertical axis turbines is devoted to the role of principal blades, in most of the cases without taking into account other parts of the wind turbine, the objective of this work is to investigate the effect of uncommon arm geometries, such as the inclined arms. The inclined arms are known to have a potentially beneficial role in the power extraction from the wind current but, due to the complexity of the phenomena, the investigation on aerodynamics of this type of turbine is often impossible...

The desirable performance attributes of a vertical axis wind turbine (VAWT) include high starting torque, high peak efficiency, broad operating grange and a reasonable insensitivity to the parameters that define its operation. The theoretical performances of three variable pitch mechanisms for VAWT are compared. Cycloturbines use cam devices or gears to impose a sinusoidal pitch regime. In the mass-stabilised system, pitch is determined by the interplay of two opposing moment on the blades. These two mechanisms are compared with “Aeropitch”, a hypothetical pitch control system in which stabilising moments are related to the blade relative velocity.

Vertical Axis Wind Turbine Evaluation and Design

Lucas Desadze, Drew Digeser, Christopher Dunn, Dillon Shoikat, 25 April 2013

This project studied the potential for installing roof-mounted vertical axis wind turbine (VAWT) systems on house roofs. The project designed several types of VAWT blades with the goal of maximizing the efficiency of a shrouded turbine. The project also used a wind simulation software program, WASP, to analyze existing wind data measured on the roofs of various WPI buildings. Scale-model tests were performed in the WPI closed-circuit wind tunnel. An RPM meter and a 12-volt step generator were used to measure turbine rotation speeds and power output at different wind speeds...

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