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Heat transfer in air-gap and thermal-fluid coupling field of a large-scale turbine generator

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Abstract

With the capacities of large-scale turbine generators increase, higher electrical and thermal loads may cause higher risk of thermal faults. Especially, for those air cooling machines with single channel ventilation system, the comparatively poor thermal conductibility of air makes the air-gap become a critical part in thermal transmission network. Thus, the heat transfer in air-gap of large scale turbine generators is followed with interest. The investigation is performed on a 150 MW air cooling turbine generator with single channel ventilation cooling system, and realized via the thermal-fluid coupling field studying. A nonlinear numerical calculation model for fluid flowing and heat transfer within the machine is proposed, and solved by finite volume method (FVM). Then, the heat transfer in the air-gap is analyzed, whilst the temperature distributions in machine different parts, as windings, stator core, and rotor components, are investigated. In addition, the velocity vector distribution of coolant in the ventilation system is also studied, and the air motion track in the air-gap is analyzed while considering the influence of rotor rotation. Finally, the influence of flow in the air-gap on fluid flowing in the stator radial ventilation ducts is investigated.

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Acknowledgements

National Natural Science Foundation of China (51477005)

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Authors and Affiliations

  1. Institution of Science and Technology, Three Gorges Co., 100038, Beijing, China

    Ying Su, Xiaoyi Zhu, Zubing Zou & Xiquan Liu

  2. Department of Network Security and Information Technology, University of International Business and Economics, Beijing, 100029, China

    Xinjian Zhuang

  3. School of Electrical Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Weili Li

  4. University of Nottingham Ningbo China, Ningbo, 315000, China

    Xiaochen Zhang

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  1. Ying Su
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  2. Xinjian Zhuang
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  5. Weili Li
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Correspondence to Ying Su.

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Su, Y., Zhuang, X., Zhu, X. et al. Heat transfer in air-gap and thermal-fluid coupling field of a large-scale turbine generator. Heat Mass Transfer 59, 269–282 (2023). https://doi.org/10.1007/s00231-022-03262-7

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  • DOI: https://doi.org/10.1007/s00231-022-03262-7

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