Nejati, Ashkan, Taj, Zia Ud Din, Etemadi, Majed, Balachandar, Ram et Barron, Ronald. 2025. « A numerical analysis of heat transfer and hydrodynamic performance in electric motors using tangential jets ». Communication lors de la conférence : CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025).
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Résumé
Effective thermal management in electric motors requires cooling strategies that mitigate stator temperature non-uniformities, a challenge inadequately addressed by axial jet impingement due to uneven oil distribution. To address this issue, this study numerically investigates the potential of tangential jet impingement as a better alternative. The focus is on offset unsubmerged jets in a confined rotating disk system, modeled after electric motor components. In this setup, the rotor and stator are represented as rotating and stationary parts, respectively. To accurately capture the flow behavior, the simulations use a three-dimensional unsteady Reynolds-Averaged Navier-Stokes approach with the SST k-? turbulence model. The Volume of Fluid method and moving mesh rotation are employed to analyze two-phase flow dynamics across a range of rotational Reynolds numbers (Re_? = 1×10^5 - 3.7×10^6). The tangential jets are positioned at 70% of the disk radius, with a nozzle diameter of 1.5 mm, ensuring targeted oil delivery to the stator surface. The results show that tangential jets provide better stator cooling compared to axial jets. The highest heat transfer occurs at a jet-to-rotor velocity ratio of 1 (Re_? = 6.1×10^5), improving thermal performance by 36%. This improvement is due to helical impingement and enhanced oil-air mixing, which promote efficient heat dissipation. Additionally, this configuration reduces temperature variations in the stator, even at lower flow rates. Increasing the speed up to Re_? = 2×10^6 enhances heat transfer by up to 30%, but exceeding this limit (Re_? = 3.7×10^6) reduces cooling efficiency by 6%. This decline occurs because excessive rotation reduces oil contact with the critical rotor-stator interfaces, limiting heat removal. Beyond thermal performance, tangential jets also improve hydrodynamic efficiency. Compared to axial jets, they reduce drag losses by 23% (Re_? = 6.1×10^5) and pressure losses by 15% (Re_? = 3.7×10^6). Their alignment with the rotating flow minimizes energy losses, making them a more efficient cooling solution. However, pressure spikes near jet exits indicate a need for optimized outlet designs to further enhance performance. Overall, a mid-range Re_? = 2×10^6 offers the best balance between oil distribution and cooling efficiency, making tangential jets ideal for stator-dominant thermal management under constrained flow rates. This study highlights their effectiveness in mitigating stator overheating and provides a foundation for future research on complex geometries and transient thermal loads for real-world motor applications.
| Type de document: | Communication (Communication) |
|---|---|
| Informations complémentaires: | Progress in Canadian Mechanical Engineering, Volume 8. Co-chairs: Lucas A. Hof, Giuseppe Di Labbio, Antoine Tahan, Marlène Sanjosé, Sébastien Lalonde and Nicole R. Demarquette. |
| Date de dépôt: | 18 déc. 2025 14:44 |
| Dernière modification: | 18 déc. 2025 14:44 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32215 |
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