Devising a method for calculating the structure of efficient cooling systems for thrust bearings and guide bearings in hydrogenerators

Authors

DOI:

https://doi.org/10.15587/1729-4061.2025.329021

Keywords:

hydrogenerator, single-row thrust bearing, oil cooler, hydraulic calculations, thermal calculations

Abstract

The object of this study is the thermal and hydraulic characteristics of the oil coolers in a thrust bearing and guide bearing cooling system of hydrogenerators.

The study addresses the task to improve the efficiency of the cooling system of the supporting elements of hydrogenerators while maintaining mass and dimension indicators. The main problems in this case are the unbalanced flow of oil within the typical cooling system and different stiffness of the thrust bearing segment supports.

The main result is the design of a cooling system structure that ensures effective heat removal from the oil. According to calculations, an oil cooler for a hydrogenerator with a capacity of 56 MW provides removal of 250 kW of losses with a heat transfer margin of 26.2%, for a hydrogenerator with a capacity of 96 MW – 150 kW and 31.8%, respectively.

The results are explained by the use of new antifriction materials for supporting elements (fluoroplastic-4) and a higher strength group material for the thrust bearing disk. The designed structure of the cooling system enables operation with preservation of isotropy of cooling liquids and does not have "dead" zones of these liquids flow.

A feature of the proposed method for calculating oil coolers is the addition to existing criterion equations of an experimental coefficient B, which takes into account the peculiarity of the geometry of the structure in addition to the nature of the oil flow and gas-dynamic parameters. The action of three-dimensional forces, temperatures, and pressures within the base metal and cooling liquids were comprehensively taken into account.

The proposed structures of the thrust bearing and guide bearing, as well as their cooling systems, could be implemented in the design and modernization of medium and high-power hydrogenerators

Author Biographies

Oleksii Tretiak, National Aerospace University Kharkiv Aviation Institute

Doctor of Technical Sciences, Associate Professor

Department of Aerohydrodynamics

Stanislav Kravchenko, National Aerospace University Kharkiv Aviation Institute

PhD

Department of Aerohydrodynamics

Oleksii Mykhailychenko, National Technical University "Kharkiv Polytechnic Institute"

PhD Student

Department of Electrical Machines

Viacheslav Nazarenko, Limited Liability Company "Kharkov Electric Machine-Building Plant"

PhD Student

Serhii Smyk, Ivan Kozhedub Kharkiv National Air Force University

PhD

Scientific Center Air Force

Oleksandr Vasyliev, National Aerospace University Kharkiv Aviation Institute

PhD Student

Department of Aircraft and Helicopter Design

Mariia Arefieva, Private Institution of General Secondary Education "Kharkiv Lyceum "IT STEP SCHOOL Kharkiv"

PhD Student

Iryna Tretiak, Limited Liability Company "Kharkov Electric Machine-Building Plant"

PhD Student

Serhii Serhiienko, Limited Liability Company "Kharkov Electric Machine-Building Plant"

PhD Student

Volodymyr Selevko, National Aerospace University Kharkiv Aviation Institute

PhD, Associate Professor

Department of Postgraduate and Doctoral Studies

References

  1. Qiu, H., He, K. (2024). Research on Torque Ripple and Influencing Factors of Hydro-Generator. Recent Patents on Engineering, 18 (1). https://doi.org/10.2174/1872212117666230127152125
  2. Flankl, M., Tuysuz, A., Kolar, J. W. (2017). Cogging Torque Shape Optimization of an Integrated Generator for Electromechanical Energy Harvesting. IEEE Transactions on Industrial Electronics, 64 (12), 9806–9814. https://doi.org/10.1109/tie.2017.2733441
  3. ODobzhanskyi, O., Duniev, O., Amiri, E., Yehorov, A., Gottipati, P., Masliennikov, A., Mendrela, E. (2021). Performance Comparison of BLDC Permanent Magnet Machines with Different Topologies. 2021 IEEE 2nd KhPI Week on Advanced Technology (KhPIWeek), 346–350. https://doi.org/10.1109/khpiweek53812.2021.9569983
  4. Casanova Garcia, G. F., Cardona Gutierrez, A. F., Mantilla Viveros, C. A. (2020). Structural component fatigue analysis of a hydrogenerator rotor. DYNA, 87 (214), 155–164. https://doi.org/10.15446/dyna.v87n214.84678
  5. Sheng, Z., Zhe, H., Zhangbin, Y., Chunde, X. (2023). Simulation and Comparative study on Cooling Performance of Thrust Bearing Cooled by Heat Pipe. 2023 IEEE 6th International Electrical and Energy Conference (CIEEC), 879–884. https://doi.org/10.1109/cieec58067.2023.10167119
  6. Tretiak, O., Kritskiy, D., Kobzar, I., Arefieva, M., Nazarenko, V. (2022). The Methods of Three-Dimensional Modeling of the Hydrogenerator Thrust Bearing. Computation, 10 (9), 152. https://doi.org/10.3390/computation10090152
  7. Liao, Y., Liao, B. (2020). Finite Element Analysis and Lightweight Design of Hydro Generator Lower Bracket. Manufacturing Technology, 20 (1), 66–71. https://doi.org/10.21062/mft.2020.017
  8. Quaranta, E., Bergamin, R., Schleiss, A. J. (2023). How to estimate the weight of hydropower electro-mechanical equipment? Available evidence, novel equations and challenges for engineering applications. Results in Engineering, 18, 101067. https://doi.org/10.1016/j.rineng.2023.101067
  9. Zhang, J., Huang, X., Wang, Z. (2024). Study of Unsymmetrical Magnetic Pulling Force and Magnetic Moment in 1000 MW Hydrogenerator Based on Finite Element Analysis. Symmetry, 16 (10), 1351. https://doi.org/10.3390/sym16101351
  10. Doost, A. K., Majlessi, R. (2015). Heat Transfer Analysis in Cooling System of Hydropower’s Generator. Open Journal of Applied Sciences, 05 (03), 98–107. https://doi.org/10.4236/ojapps.2015.53010
  11. El-Zohri, E. H., Shafey, H. M., Kahoul, A. (2019). Performance evaluation of generator air coolers for the hydro-power plant of Aswan High Dam at Egypt. Energy, 179, 960–974. https://doi.org/10.1016/j.energy.2019.05.006
  12. Wang, Y., Cai, Y., Zhang, J., Chen, Z., Li, C., Sun, W. (2025). Investigation on heat transfer mechanism simulation and structure optimization design of hydraulic turbine bearing semi-ring cooler. Heliyon, 11 (3), e42328. https://doi.org/10.1016/j.heliyon.2025.e42328
  13. Nowicki, R., Morozov, N. (2017). Thrust bearing monitoring of vertical hydro-turbine-generators. Conference: 1st World Congress on Condition Monitoring. London. Available at: https://www.researchgate.net/publication/318654615_Thrust_bearing_monitoring_of_vertical_hydro-turbine-generators
  14. Muhsen, A., Kizilova, N. (2021). The Advanced Cooling System of Generator for Hydropower Plant. eNergetics. Available at: https://www.researchgate.net/publication/358981403_The_Advanced_Cooling_System_of_Generator_for_Hydropower_Plant
  15. Liming, Z., Yongyao, L., Zhengwei, W., Xin, L., Yexiang, X. (2017). A review on the large tilting pad thrust bearings in the hydropower units. Renewable and Sustainable Energy Reviews, 69, 1182–1198. https://doi.org/10.1016/j.rser.2016.09.140
  16. Pitchurov, G. T., Markov, D., Georgiev, E. (2023). Verification of the capacity of lubricating oil cooler system of turbine bearings. IOP Conference Series: Earth and Environmental Science, 1128 (1), 012019. https://doi.org/10.1088/1755-1315/1128/1/012019
  17. Adaramola, B. A., Musa, A. (2020). Modification and Performance Evaluation of Turbo Generator’s Oil Coolers for Electricity Generation. International Journal of Scientific Engineering and Applied Science (IJSEAS), 6 (11), 138–148. Available at: https://ijseas.com/volume6/v6i11/ijseas20201116.pdf
  18. 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
  19. Tretiak, O., Kritskiy, D., Kobzar, I., Arefieva, M., Selevko, V., Brega, D. et al. (2023). Stress-Strained State of the Thrust Bearing Disc of Hydrogenerator-Motor. Computation, 11 (3), 60. https://doi.org/10.3390/computation11030060
Devising a method for calculating the structure of efficient cooling systems for thrust bearings and guide bearings in hydrogenerators

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Published

2025-06-27

How to Cite

Tretiak, O., Kravchenko, S., Mykhailychenko, O., Nazarenko, V., Smyk, S., Vasyliev, O., Arefieva, M., Tretiak, I., Serhiienko, S., & Selevko, V. (2025). Devising a method for calculating the structure of efficient cooling systems for thrust bearings and guide bearings in hydrogenerators. Eastern-European Journal of Enterprise Technologies, 3(1 (135), 38–50. https://doi.org/10.15587/1729-4061.2025.329021

Issue

Vol. 3 No. 1 (135) (2025): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2025 Oleksii Tretiak, Stanislav Kravchenko, Oleksii Mykhailychenko, Viacheslav Nazarenko, Serhii Smyk, Oleksandr Vasyliev, Mariia Arefieva, Iryna Tretiak, Serhii Serhiienko, Volodymyr Selevko

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