NUMERICAL ASSESSMENT OF THE AERODYNAMIC PERFORMANCE OF A VERTICAL-AXIS WIND TURBINE UNDER VARIABLE WIND CONDITIONS

Abstract

In the modern world, the use of green technologies, particularly hybrid vertical-axis wind energy systems, occupies one of the leading positions in saving energy resources, stabilizing environmental issues, and increasing the reliability and continuity of power supply. Enhancing the efficiency of vertical-axis wind energy systems under low wind speeds is of great importance. Based on analysis, it has been determined that using the CFD model in the Ansys Fluent system provides good results in designing the optimal dimensions of wind turbine blades. The hybrid Savonius – Darrieus wind turbine was designed in a two-dimensional (2D) model in Ansys Fluent, simulated, and its performance under variable wind flow conditions was evaluated. The efficiency coefficient indicators of the hybrid Savonius – Darrieus wind turbine under variable wind flow conditions are presented. It was found that when the blade tip speed ratio is 2.5, the maximum power coefficient reaches 0.4. It has been identified that the efficiency and reliability of vertical-axis wind energy systems under variable wind flow conditions depend on the shape, material, and aerodynamics of the turbine blades.

Keywords

References

1. Jahonda sh a mol en ergiyasidan foydalanish ko ‘ rsatk ichlari. https://gwec.net/globalwindreport2023/#:~:text=Total%20installed%20global%20capacity%20 grew,%2Dyear%20growth%20of%2015%25.
2. Shamol ene r getik qurilmalarini rivojlantirish tendensiyalari. https://wwindea.org/wwea - half - year - report - 2023 - additional - momentum - for - windpower - in - 2023.
3. O‘zbekiston Respublikasi Prezidentining 2022 -yil 2-dekabrdagi PQ-436- son “2030 -yilgacha Oʻzbekiston Respublikasining “yashil” iqtisodiyotga oʻtishiga qaratilgan islohotlar samaradorligini oshirish boʻyicha chora - tadbirlar toʻgʻrisida”gi qarori. https://lex.uz/docs/- 6303230. 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 Cp λ F. Ghafoorian M. Moreno Taklif etilgan qurilma INNOVATSION TEXNOLOGIYALAR INNOVATIVE TECHNOLOGIES ИННОВАЦИОННЫЕ ТЕХНОЛОГИИ 2026 - yil 3 (63) - son 2026 volume 63, number 3 Том 63 No 3, 202 6 ISSN 2181 - 4732 E - ISSN 2181 - 4 015 102
4. J. S. Akhatov, Kh. S. Ahmadov. Extraction of Hydrogen from Water Using CeO 2 in a Solar Reactor Using a Concentrated Flux of Solar Radiation. Applied Solar Energy, 2022, Vol. 58, No. 6, pp. 889 – 894.
5. A.B Safarov, H.A. Davlonov, R.A Mamedov, M. Cha rieva, D. Kodirov. Design and modeling of dynamic modes of low speed electric generators for electric power generation from renewable energy sources. (2022) AIP Conference Proceedings 2686(1):020013.
6. A. Safarov, R. Mamedov. Study of effective omni - dire ctional vertical axis wind turbine for low speed regions. IIUM Engineering Journal, Vol. 22, No. 2, 2021.
7. G.N. Uzakov, H.A. Davlonov, K.N. Holikov. Study of the influence of the source biomass moisture content on pyrolysis parameters. Applied Solar Ene rgy. Volume 54, pages 481 – 484, (2018).
8. N.N Sadullayev, A.B Safarov, R.A Mamedov, D. Kodirov. Assessment of wind and hydropower potential of Bukhara region. (2020) IOP Conf. Ser.: Earth Environ. Sci. 614 012036.
9. Farhan L. Rashid, Hussain S. Abd and Emad Q. Hussein. Numerical study of the air flow over modified NACA 2412 airfoil using CFD. AIP Conference Proceedings 2415, 020005 (2022); https://doi.org/10.1063/5.0092303.
10. S.A. Khan, M. Bashir, M.A. Ali Baig, F.A. Ghasi Mehaboob Ali. Comparing the Effect of Different Turbulence Models on The CFD Predictions of NACA0018 Airfoil Aerodynamics. CFD Letters 12, Issue 3 (2020) 1 - 10.
11. B. Steenwijk, P. Druetta. Numerical Study of Turbulent Flows over a N ACA 0012 Airfoil: Insights into Its Performance and the Addition of a Slotted Flap. Appl. Sci. 2023, 13, 7890. https://doi.org/10.3390/app13137890.
12. N. Shelil. 2D Numerical Simulation Study of Airfoil Performance. Wind Energy Science Discussion. https://doi.org/10.5194/wes - 2021 - 45.
13. Y. F. Görgülü, M. A. Özgür, R. Köse. CFD Analysis of a Naca 0009 Aerofoil at a Low Reynolds Number. Politeknik Dergi si, 2021; 24 (3): 1237 - 1242
14. A. Kulshreshtha, S. Kumar Gupta, P. Singhal. FEM/CFD analysis of wings at different angle of attack. Materials Today: Proceedings. March 2020 Materials Today Proceedings 26(18).
15. A. Ullah, M. B. Zaman, M. A. Bhatti, D. Qasim, A. Hamid, Q. Xiong, A. Khan. CFD study of drag and lift coefficients of non - spherical particles. Journal of King Saud University - Engineering Sciences. https://doi.org/10.1016/j.jksues.202 1.10.003.
16. M. Shirzadi, P. A. Mirzaei, M. Naghashzadegan. Improvement of k - epsilon turbulence model for CFD simulation of atmospheric boundary layer around a high - rise building using stochastic optimization and Monte Carlo Sampling technique. Volume 1 71, December 2017, Pages 366 - 379.
17. H. Wei, Y. Chen. Assessment of different turbulence models on the large scale internal heated water pool natural convection simulation. Annals of Nuclear Energy. Volume 131, September 2019, Pages 23 - 38.
18. A. Rezaeiha, H. Montazeri, B. Blocken. On the accuracy of turbulence models for CFD simulations of vertical axis wind turbines. Energy. Volume 180, 1 August 2019, Pages 838 - 857
19. R. Lanzafame, S. Mauro, M. Messina. Wind turbine CFD modeling using a corr elation - based transitional model. Renewable Energy. Volume 52, April 2013, Pages 31 - 39.
20. L. Santamaría, M. G. Vega, A. Pandal, J. G. Pérez, S. Velarde ‐ Suárez, J. Manuel Fernández Oro. Aerodynamic Performance of VAWT Airfoils: Comparison between Wind Tunnel Testing Using a New Three ‐ Component Strain Gauge Balance and CFD Modelling. Energie s 2022, 15, 9351. https://doi.org/10.3390/en15249351.
21. G. Farzad, M. Seyed Reza, E. Mohammad, M. Mehdi. A systematic investigation on the hybrid Darrieus - Savonius vertical axis wind turbine aerodynamic performance and self - starting capability improvement by installing a curtain, Next Energy 6 (2025) 100203.
22. M. Moreno, I. Trejo - Zúñiga, J. Terrazas, A. Díaz - Ponce, A. Pérez - Terrazo. Hybridization of a Micro - Scale Savonius Rotor Using a Helical Darrieu s Rotor, Fluids 2025, 10, 63.