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Compact wind turbine with an air flow concentrator for regions of low speed wind

Compact low-power wind turbines (up to 1 kW) are of interest for individual consumers and for mobile applications. Typical wind power plants (wind turbines) with a wind turbine diameter of about 3 meters have a power of about 1 kW at a wind speed of 10 m / s. However, for most of Ukraine, the average wind speed does not exceed 5 m / s and the power of such wind turbines will be only 120 W. The proposed design of the wind turbine in the form of a turbine installed in the concentrator of air flow allows even with an average wind speed to obtain greater efficiency and safety in comparison with the "classic" wind turbines. In addition, light weight, closed construction and relatively small transverse dimensions allow the use of aerodynamic systems for lifting wind turbines instead of stationary and expensive supports. The results of the calculation of the wind turbine with the ANSYS CFX are presented and compared with the field experiments for two turbines with 20 and 5 blades. The calculations of the 5-blade turbine are in good agreement with the experiment, whereas for the 20-blade inconsistency it is caused by an incorrect estimate of the flow velocity at the inlet to the concentrator. The proposed method for analyzing the joint operation of a turbine and a generator has shown a shortage of the selected resistive load of the generator, leading to the operation of the turbine in the region of small values of tip speed ratio.