Devising a method for assessing efficiency of the cooling system and determining the thermal state of vertical synchronous hydrogenerators using three-dimensional CFD simulation
DOI:
https://doi.org/10.15587/1729-4061.2026.350505Keywords:
hydrogenerator ventilation system, CFD simulation, rotor channels, fan operating characteristicAbstract
This study explores heat and mass transfer processes in the structural elements of an umbrella-type hydrogenerator, as well as the ventilation and cooling system in the active components of the hydrogenerator. A vertical synchronous air-cooled hydrogenerator with a rated capacity of 60 MW has been investigated.
The task addressed relates to the cooling efficiency of generator components. Conventional analytical calculation methods do not make it possible to identify local overheating zones and pressure distribution in complex ventilation channels. Therefore, it becomes necessary to use numerical methods and algorithms to calculate and analyze the cooling efficiency of the generator’s active parts.
The main result of this study is the designed structure of the guide channels (blades) of the rotor, which provides the required air flow rate of 45 m3/s. At the same time, the maximum values of the winding temperature do not exceed the permissible values for class F insulation.
The CFD calculation detailed the action of the superchargers and showed the real pressure in the channels and the volume of air passing through each section of the generator. The error between the results from CFD modeling and analytical calculations is less than 3%.
The results are attributed to the detailed reproduction of the geometry of the ventilation channels in the 3D model, which made it possible to determine the real aerodynamic resistance and cooling medium consumption.
The proposed method uses the boundary conditions of the third kind for a comprehensive calculation of the conjugate heat and mass transfer.
The proposed structure could be implemented in the design and modernization of air-cooled hydrogenerators.
References
- Hydropower Special Market Report (2021). International Energy Agency. Available at: https://www.iea.org/reports/hydropower-special-market-report
- Siciliano, G., Urban, F. (Eds.) (2017). Chinese Hydropower Development in Africa and Asia. Routledge. https://doi.org/10.4324/9781315440040
- Rutschmann, P., Kampa, E., Wolter, C., Albayrak, I., David, L., Stoltz, U., Schletterer, M. (Eds.) (2022). Novel Developments for Sustainable Hydropower. Springer International Publishing. https://doi.org/10.1007/978-3-030-99138-8
- Renewable Power Generation Costs in 2022 (2023). IRENA. Available at: https://www.irena.org/Publications/2023/Aug/Renewable-Power-Generation-Costs-in-2022
- World Hydropower Outlook (2023). International Hydropower Association. Available at: https://www.hydropower.org/publications/2023-world-hydropower-outlook
- Quaranta, E., Aggidis, G., Boes, R. M., Comoglio, C., De Michele, C., Ritesh Patro, E. et al. (2021). Assessing the energy potential of modernizing the European hydropower fleet. Energy Conversion and Management, 246, 114655. https://doi.org/10.1016/j.enconman.2021.114655
- Traxler-Samek, G., Binder, A., Bartosch, M. (2020). Combination of Numerical and Analytical Methods for Hydrogenerator Calculation. 2020 International Conference on Electrical Machines (ICEM), 2589–2595. https://doi.org/10.1109/icem49940.2020.9270973
- Traxler-Samek, G., Zickermann, R., Schwery, A. (2010). Cooling Airflow, Losses, and Temperatures in Large Air-Cooled Synchronous Machines. IEEE Transactions on Industrial Electronics, 57 (1), 172–180. https://doi.org/10.1109/tie.2009.2031191
- Yu, W., Fangmian, D., Jiankangy, W., Ziran, C., Lin, R. (2022). Effect of evaporative cooling of stator core on electromagnetic field of large horizontal generator. 2022 25th International Conference on Electrical Machines and Systems (ICEMS), 1–4. https://doi.org/10.1109/icems56177.2022.9982834
- Tome-Robles, D. J., Nøland, J. K., Maurer, F., Øyvang, T. (2023). Thermal Mapping of the Hydrogenerator’s Reactive Power Boosting Ability at Various Time Windows. 2023 IEEE Power & Energy Society General Meeting (PESGM), 1–5. https://doi.org/10.1109/pesgm52003.2023.10252548
- Shan, R., Duan, J., Zeng, Y., Qian, J., Dong, G., Zhu, M., Zhao, J. (2024). Study on the Thermal Field of a Hydro-Generator under the Effect of a Plateau Climate. Energies, 17 (4), 932. https://doi.org/10.3390/en17040932
- Fan, Y., Wen, X., Xu S., Deng, W. (2006). 3D Analysis and Calculation of Stator Temperature Field of Hydro-generator in the Case of Sudden Short Circuit. Conference Record of the 2006 IEEE International Symposium on Electrical Insulation, 155–158. https://doi.org/10.1109/elinsl.2006.1665280
- Fan, Y., Wen, X., Jafri, S. A. K. S. (2012). 3D transient temperature field analysis of the stator of a hydro-generator under the sudden short-circuit condition. IET Electric Power Applications, 6 (3), 143–148. https://doi.org/10.1049/iet-epa.2011.0039
- Yehorov, A., Duniev, O., Masliennikov, A., Gouws, R., Dobzhanskyi, O., Stamann, M. (2025). Study on the Thermal State of a Transverse-Flux Motor. IEEE Access, 13, 20893–20902. https://doi.org/10.1109/access.2025.3534284
- Shevchenko, V. V., Shylkova, L. V., Strokous, A. V. (2022). Determination of the Permissible Range of Turbogenerators Non-Nominal Operating Modes at Thermal Power Plants. 2022 IEEE 4th International Conference on Modern Electrical and Energy System (MEES), 01–05. https://doi.org/10.1109/mees58014.2022.10005663
- SanAndres, U., Almandoz, G., Poza, J., Ugalde, G. (2014). Design of Cooling Systems Using Computational Fluid Dynamics and Analytical Thermal Models. IEEE Transactions on Industrial Electronics, 61 (8), 4383–4391. https://doi.org/10.1109/tie.2013.2286081
- Dang, D.-D., Pham, X.-T., Labbe, P., Torriano, F., Morissette, J.-F., Hudon, C. (2018). CFD analysis of turbulent convective heat transfer in a hydro-generator rotor-stator system. Applied Thermal Engineering, 130, 17–28. https://doi.org/10.1016/j.applthermaleng.2017.11.034
- Vasylenko, S. M., Kulinchenko, V. R., Shevchenko, O. Yu., Piddubnyi, V. A. (2024). Hidrohazodynamika. Kyiv: Vydavnychyi dim «Kondor», 676. Available at: https://condor-books.com.ua/monografiyi/gidrogazodinamika-monografiya
- Howard, G. J. (2017). Finite Element Modelling of Creep for an Industrial Application. University of Pretoria. Available at: http://hdl.handle.net/2263/60133
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Copyright (c) 2026 Andrii Yehorov, Stanislav Kravchenko, Oleksii Duniev, Oleksandr Vasyliev, Denys Hromenko, Serhii Lukashevych, Oleh Buhaiov, Kostiantyn Liakhov, Anton Kovryga, Dmytro Obidin
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