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Geometrical Parameters Influencing the Aerodynamic Efficiency of a Small-Scale Self-Pitch High Solidity VAWT

Carlos Xisto (Institutionen för tillämpad mekanik) ; José Páscoa ; Michele Trancossi
Journal of solar energy engineering (0199-6231). Vol. 138 (2016), 3, p. 031006-031006-8.
[Artikel, refereegranskad vetenskaplig]

In the paper, four key design parameters with a strong influence on the performance of a small-scale high solidity variable pitch VAWT (Vertical Axis Wind Turbine), operating at low tip-speed-ratio (TSR) are addressed. To this aim a numerical approach, based on a finite-volume discretization of two-dimensional Unsteady RANS equations on a multiple sliding mesh, is proposed and validated against experimental data. The self-pitch VAWT design is based on a straight blade Darrieus wind turbine with blades that are allowed to pitch around a feathering axis, which is also parallel to the axis of rotation. The pitch angle amplitude and periodic variation are dynamically controlled by a four-bar-linkage system. We only consider the efficiency at low and intermediate TSR, therefore the pitch amplitude is chosen to be a sinusoidal function with a considerable amplitude. The results of this parametric analysis will contribute to define the guidelines for building a full size prototype of a small scale turbine of increased efficiency.



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Denna post skapades 2016-02-22. Senast ändrad 2016-06-22.
CPL Pubid: 232309

 

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Energi
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