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The project/research was financed in the framework of the Lublin University of Technology founds conducting scientific activities FD - discipline fund, funded by the Polish Ministry of Science and Higher Education - Article 365 (2) of July 20, 2018.
The article presents the results of the Computational Fluid Dynamics (CFD) research on a vertical axis wind
turbine with a variable swept area. The tested turbine has four sets of blades, each of which consists of two
moving parts. By changing the angle between these parts, it is possible to change the swept area of the turbine
wheel to adjust the characteristics of the turbine to the current wind speed. In the case of strong wind, it is pos-
sible to fold blades to protect the rotor against damage. The 3D-CFD model was tested using the ANSYS Fluent
software. The four rotors differing in the blade angle were analyzed. The tests were carried out for different
wind speeds. The results are presented as pressure and velocity distributions as well as streamlines around the
rotor. In addition, the waveforms of the torque acting on a single blade and on the entire rotor are shown. The
average rotor torque was also calculated. These findings enabled us to create the characteristics of the power
factor for different rotational speeds of the rotor. The results show that the adjustment of the swept area makes
the z-turbine have a flexible operating range.
