Кафедра Галузеве машинобудування ДМетІ (з 2022 р. утворилась шляхом з'єднання кафедри Колісних і гусеничних транспортних засобів та кафедри Машини та агрегати металургійного виробництва)

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ENG: Faculty of Machine Design and Environmental Protection Dnipro Metallurgical Institute

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Maximizing the Efficiency of Low-Speed Horizontal Axis Wind Turbines Designed for Use in Coal Mining Industry
(M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Dnipro, 2025) Khamіnіch, Оleksandr; Zinchenko, Andrii; Baiul, Konstantin V.
ENG: The prospects for using a low-speed wind turbine with a horizontal axis of rotation to improve the efficiency of coal industry enterprises during their diversification are investigated. The necessity of addressing the optimal design of wind turbines with a horizontal axis of rotation for such conditions is emphasized, as this can ensure their use both during the operation of enterprises and after their diversification. The relationship equation from the theory of Sabinin-Yuriev has been adapted to the conditions of rotors of low-speed wind turbines, allowing for its analytical solution to be obtained. As a result, an analytical formula for calculating the value of the skew angle has been derived for the first time. This angle is formed between the directions of the vectors of the total velocity of the undisturbed and disturbed flows, depending on the aerodynamic qualities of the profile and the speed of the rotor blade section. This has led to the formulation of equations to analytically determine the components of the integrand function for calculating the wind energy utilization coefficient by the rotor. An analytical dependence of the coefficient of wind energy utilization, which is created by the blade cross-section under the action of the wind, from the aerodynamic qualities of the profile and the speed of the rotor blade cross-section, which does not require solving the connection equation and allows searching for its extrema and direct integration along the rotor blade. For the intervals of change in values characterizing the dependence of the wind energy utilization coefficient of the blade cross-section on the aerodynamic qualities of the profile and the speed of the rotor blade cross-section, calculations were performed that prove the existence of a single maximum in this function, which is located closer to the outer edge of the blade. The value of this maximum changes with a change in the blade cross-section profile, i.e., it depends on the aerodynamic properties of the profile used. Thus, the developed calculation methods allow determining the geometric characteristics of the rotor blade cross-sections of a low-speed wind turbine with a horizontal axis of rotation, namely the angle of twist of the cross-section and the chord length of the blade in the cross-section, as well as the radius of the rotor, which ensure the maximum coefficient of wind energy utilization, depending on the wind speed, rotor rotation frequency, and type of aerodynamic profile of the blade cross-section. Such a methodological approach to calculating rotor parameters allows for the optimal design of horizontal axis wind turbines for coal industry enterprises during their diversification and during the direct operation of enterprises.