Research of the influence of the airflow concentrator on the energy indicators of the vertical-axial model rotary wind motor

Wind power plants are profitable with an average annual wind speed of more than 5 m/s. One of the ways to improve their efficiency in regions with low average annual wind speeds is to use air flow concentrators. The spread of air flow concentrators is constrained by the lack of data on their impact on the main energy characteristics of wind power plants. The test provides for the determination of the energy parameters of a model of a vertical-axial rotary wind turbine with an air flow concentrator depending on the angle of installation of flat vertical guides on it using a wind tunnel. To achieve this goal, a laboratory setup was developed and manufactured. It consists of a model of a wind turbine rotor, which has a three-bladed rotor with certain structural and energy characteristics and directly with an air flow concentrator with the ability to set the angle of inclination of flat guides within 25º- 40º. Depending on the angle of inclination of the flat vertical guides in relation to the direction of the wind flow. Determination of the power on the shaft of the wind turbine was carried out indirectly through the mass of the load and the number of revolutions. The results of laboratory tests indicate that, subject to the recommended proportions of the linear dimensions of the blades and their relative position, the maximum power is achieved, corresponding to the angle of inclination of the vertical guides of 30°. The obtained results of laboratory tests made it possible to manufacture a vertical-axial rotary wind turbine with two rotors and an air flow concentrator, the tests of which in full-scale conditions confirmed the correctness of the decisions made.