Eastern-European Journal of Enterprise Technologies ISSN 1729-3774 2/8 ( 122 ) 2023 36 Copyright © 2023, Authors. This is an open access article under the Creative Commons CC BY license DETERMINATION OF THE AERODYNAMIC CHARACTERISTICS OF A WIND POWER PLANT WITH A VERTICAL AXIS OF ROTATION Nazgul Tanasheva PhD, Associate Professor* Akmaral Tleubergenova Doctoral Student* Ainura Dyusembaeva PhD, Senior Lecturer* Amangeldy Satybaldin Candidate of Chemical Sciences, Associate Professor* Elmira Mussenova Candidate of Physical and Mathematical Sciences, Associate Professor Department of Physics and Nanotechnology** Asem Bakhtybekova Correspondence author Doctoral Student* E-mail: asem.alibekova@inbox.ru Nurgul Shuyushbayeva PhD, Associate Professor Department of Mathematics, Physics and Computer Science Sh. Ualikhanov Kokshetau State University Abaya str., 76, Kokshetau, Republic of Kazakhstan, 020000 Sholpan Kyzdarbekova Master’s degree, Senior Lecturer* Saniya Suleimenova Master’s Degree, Senior Lecturer* Ardak Tussypbayeva Master’s Degree, Senior Lecturer* *Department of Engineering Thermophysics** **Karaganda Buketov University University str., 28, Karaganda, Republic of Kazakhstan, 100024 Wind energy is a commercially proven and rapidly developing type of electrici- ty generation. Wind power plants with a vertical axis are more attractive and better suited for use in cities and urban environments where wind flow is less pre- dictable compared to widespread wind power plants with a horizontal axis of rotation. This makes them a much better choice for both ground installation and/or for mounting on buildings and roofs that would otherwise limit the installation of higher horizontal turbine structures. The paper describes an experimental study of the drag force and its coefficient for wind turbines with a vertical axis of rotation. The object of the study is a labo- ratory model of a wind turbine with blades made in the form of rotating cylinders with a fixed blade. Experimental studies were carried out in the T-1-M wind tun- nel, measurements of aerodynamic force were carried out using three-component scales. A distinctive feature of the work is the combined use of the lifting force of the cylinders, as well as the lifting force of the fixed plate. Due to this solution, when comparing with existing wind tur- bines with a vertical axis of rotation, it was found that the wind turbine in ques- tion prevails by 25–100 % in the number of revolutions. The dependences of the drag force on the flow velocity and the drag coefficient on the Reynolds num- ber from 1·104 to 4·104 are obtained. An uncertainty analysis was also carried out in order to determine the uncertainty by type A, B and the total uncertainty, from which it was found that the measurement error was 1.13 %. The field of the prac- tical application of the results obtained in laboratory studies will be useful in the development of prototypes of wind tur- bines with a vertical axis of rotation Keywords: aerodynamics, flow, com- bined blade, flow velocity, drag force, thrust force UDC 533.6 DOI: 10.15587/1729-4061.2023.277759 How to Cite: Tanasheva, N., Tleubergenova, A., Dyusembaeva, A., Satybaldin, A., Mussenova, E., Bakhtybekova, A., Shuyushbayeva, N., Kyzdarbekova, S., Suleimenova, S., Tussypbayeva, A. (2023). Determination of the aerodynamic characteristics of a wind power plant with a vertical axis of rotation. Eastern-European Journal of Enterprise Technologies, 2 (8 (122)), 36–43. doi: https://doi.org/10.15587/1729-4061.2023.277759 Received date 08.02.2023 Accepted date 14.04.2023 Published date 28.04.2023 1. Introduction One of the most important features of the development of the modern world is the emphasis of the world community on the problems of rationality and efficiency of the use of energy resources, the introduction of energy-saving technologies and the search for renewable energy sources. The growing need of mankind for energy resources leads to the need to search for alternative sources of energy supply and their widespread use. Among the types of alternative energy, wind energy is distinguished by its high efficiency and accessibility. Over the past few decades, wind power has emerged in a number of countries into separate branches of energy farms that suc- cessfully compete with traditional energy [1]. 2015 was a significant year for Denmark, in which more than 40 % of electricity was generated from wind energy (the highest volume ever recorded worldwide) [1], while Ireland, Portugal and Spain produce approximately 20 % of their