The business of energy production from small size systems is growing quickly and technical solutions already proposed in the past are analyzed and developed again. Thus in the latest years the vertical axis configuration is receiving a special attention for small wind energy conversion systems. The complex aerodynamics of these wind turbines can be modeled suitably by means of the computational fluid dynamics (CFD) taking into account the overall results of simplified models. In the paper two-dimensional CFD calculations of a vertical axis wind turbine with straight blades (H-type VAWT) are shown and discussed. CFD analyses provide fundamental information concerning the flow field in and around the rotor as well as the wind turbine performance. The results obtained by solving the unsteady Reynolds Averaged Navier-Stokes equations (RANSE) by means of a CFD code are discussed for steady cyclic conditions. The overall results are summarized by diagrams where the characteristic curve drawn after the CFD calculations is compared with the curve obtained by the free wake semi-empirical method taking as reference experimental data.
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|Titolo:||NUMERICAL INVESTIGATION OF A GIROMILL VERTICAL AXIS WIND TURBINE BY A TWO-DIMENSIONAL ANALYSIS|
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|