Marco Raciti Castelli and Stefano De Betta and Ernesto Benini
Effect of Blade Number on a StraightBladed VerticalAxis Darreius Wind Turbine
68 - 74
2012
6
1
International Journal of Aerospace and Mechanical Engineering
https://publications.waset.org/pdf/12820
https://publications.waset.org/vol/61
World Academy of Science, Engineering and Technology
This paper presents a mean for reducing the torque
variation during the revolution of a verticalaxis wind turbine
(VAWT) by increasing the blade number. For this purpose, twodimensional
CDF analysis have been performed on a straightbladed
Darreiustype rotor. After describing the computational model, a
complete campaign of simulations based on full RANS unsteady
calculations is proposed for a three, four and fivebladed rotor
architecture characterized by a NACA 0025 airfoil. For each
proposed rotor configuration, flow field characteristics are
investigated at several values of tip speed ratio, allowing a
quantification of the influence of blade number on flow geometric
features and dynamic quantities, such as rotor torque and power.
Finally, torque and power curves are compared for the analyzed
architectures, achieving a quantification of the effect of blade number
on overall rotor performance.
Open Science Index 61, 2012