  This paper presents a numerical and experimental analysis of the patent of a
device to be used in vertical-axis wind turbines (VAWTs) under extreme wind
conditions. The device consists of two hemispheres interconnected by a set of
conveniently implemented variable section ducts through which the wind
circulates to the blades. Furthermore, the design of the cross-section of the
ducts allows the control of the wind speed inside the device. These ducts are
intended to work as diffusers or nozzles, depending on the needs of the
installation site. Simulations were performed for the case of high-speed
external wind, for which the ducts act as diffusers to reduce wind speed and
maintain a well-functioning internal turbine. Four different patent designs
were analyzed, focusing on turbine performance and generated power. The results
indicate that the patent allows the generation of electric power for a greater
range of wind speeds than with a normal wind turbine. The results support that
this patent may be a good alternative for wind power generation in geographic
areas with extreme weather conditions or with maintained or strong gusty wind.
Experimental tests were carried out on the movement of the blades using the
available model. Finally, the power curve of the model of this wind turbine was
obtained.
