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Numerical Study on the Influence of Vortex Generator Arrangement on Heat Transfer Enhancement of Oil-Cooled Motor

Author

Listed:
  • Junjie Zhao

    (College of Civil Engineering, Tongji University, Shanghai 200092, China
    These authors contributed equally to this work and should be considered co-first authors.)

  • Bin Zhang

    (College of Civil Engineering, Tongji University, Shanghai 200092, China
    These authors contributed equally to this work and should be considered co-first authors.)

  • Xiaoli Fu

    (College of Civil Engineering, Tongji University, Shanghai 200092, China)

  • Shenglin Yan

    (School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China)

Abstract

At present, vortex generators have been extensively used in radiators to improve the overall heat transfer performance. However, there is no research on the effect of vortex generators on the ends of motor coils. Meanwhile, the current research mainly concentrates on the attack angle, shape and size, and lacks a detailed study on the transverse and longitudinal distance and arrangement of vortex generators. In this paper, the improved dimensionless number R is used as the key index to evaluate the overall performance of enhanced heat transfer. Firstly, the influence of the attack angle on heat transfer enhancement is discussed through a single pair of rectangular vortex generators, and the results demonstrate that the vortex generator with a 45° attack angle is superior. On this basis, we compare the effects of different longitudinal distances (2 h , 4 h , and 6 h , h meaning the height of vortex generator) on enhanced heat transfer under four distribution modes: Flow-Up ( FU ) , Flow-Down ( FU ) , Flow-Up-Down ( FUD ) , Flow-Down-UP ( FDU ). Thereafter, the performances of different transverse distances (0.25 h , 0.5 h , and 0.75 h ) of the vortex generators are numerically simulated. When comparing the longitudinal distances, FD with a longitudinal distance of 4 h ( FD- 4 h ) performs well when the Reynolds number is less than 4000, and FU with a longitudinal distance of 4 h ( FU- 4 h ) performs better when the Reynolds number is greater than 4000. Similarly, in the comparison of transverse distances, FD- 4 h still performs well when the Reynolds number is less than 4000, and FU with a longitudinal distance of 4 h and transverse distance of 0.5 h ( FU- 4 h –0.5 h ) is more prominent when the Reynolds number is greater than 4000.

Suggested Citation

  • Junjie Zhao & Bin Zhang & Xiaoli Fu & Shenglin Yan, 2021. "Numerical Study on the Influence of Vortex Generator Arrangement on Heat Transfer Enhancement of Oil-Cooled Motor," Energies, MDPI, vol. 14(21), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:6870-:d:660457
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    References listed on IDEAS

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    Cited by:

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    2. Artur S. Bartosik, 2022. "Numerical Heat Transfer and Fluid Flow: A Review of Contributions to the Special Issue," Energies, MDPI, vol. 15(8), pages 1-8, April.
    3. Artur S. Bartosik, 2023. "Numerical Heat Transfer and Fluid Flow: New Advances," Energies, MDPI, vol. 16(14), pages 1-7, July.

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