THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Qiang Zhao

,

Yichao Yuan

FLOW AND HEAT TRANSFER CHARACTERISTICS OF HIGH PRESSURE NATURAL GAS IN THE GAPS OF HIGH-SPEED MOTORS WITH A HIGH RADIUS RATIO

ABSTRACT
A motor stator-gap-rotor model is established based on the numerical heat transfer theory by using the finite volume method. The flow evolution of high-pressure natural gas in the gap with a radius ratio of 0.971 is investigated. The results demonstrate that the flow patterns of high pressure natural gas in the motor gap can be categorized into turbulent, spiral Taylor-Couette, and turbulent Taylor-Couette flow. The flow ranges are determined based on the Ta/Re2. Then, the flow and heat transfer characteristics of the cooling medium in the gap under different flow regimes as well as the mechanism of locally enhanced heat transfer in the gap by the Taylor-Couette flow are explored. Finally, the mathematical expressions for the Nusselt number of motor gap are determined in terms of the Reynolds number, Taylor number, and Prandtl number by fitting using the L-venberg-Marquardt and global optimization methods. Using these expressions, the flow and heat transfer characteristics in the motor gap can be predicted. Overall, this study provides useful and novel insights on the design of cooling systems for high-speed motors.
KEYWORDS
high radius ratio, high-pressure natural gas, Taylor-Couette flow, high-speed motor, numerical simulation
PAPER SUBMITTED: 2023-11-27
PAPER REVISED: 2024-01-28
PAPER ACCEPTED: 2024-01-31
PUBLISHED ONLINE: 2024-04-14
DOI REFERENCE: https://doi.org/10.2298/TSCI231127090Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [3725 - 3736]
REFERENCES
  1. Li, S. L., et al., High-Speed Electrical Machines: High-Speed Electric Machines: Challenges and Design Considerations, IEEE Transactions on Industrial Electronics, 2 (2016), 1, pp. 2-13
  2. Oguz, A. H., et al., Design and Optimization of an Axially-Slitted High-Speed Solid Rotor Induction Motor, Proceedings, 9th International Conference on Electrical and Electronics Engineering (ELECO), Bursa, Turkey, 2015, pp. 568-573
  3. Gao, Q. X., et al., Copper Loss Analysis and Loss Separation Method in a Dynamic Process of Ultra- High Speed Motor with Slotless Stator, IET Electric Power Applications, 17 (2023), 4, pp. 464-473
  4. Li, X. L., et al., Incorporating Harmonic-Analysis-Based Loss Minimization into MPTC for Efficiency Improvement of FCFMPM Motor, IEEE Transactions on Industrial Electronics, 70 (2023), 7, pp. 6540- 6550
  5. Saari J. Thermal Analysis of High-Speed Induction Machines, Helsinki University of Technology, Helsinki, Finland, 1998
  6. Naseem, U., et al., Experimental Investigation of Flow Instabilities in a Wide Gap Turbulent Rotating Taylor-Couette Flow, Case Studies in Thermal Engineering, 14 (2019), 100449
  7. Tanaka, R., et al., DNS of Taylor-Couette Flow between Counter-Rotating Cylinders at Small Radius Ratio, International Journal of Advances in Engineering Sciences and Applied Mathematics, 10 (2018), 6, pp. 159-170
  8. Sznitko, E. T., et al., Flow Dynamics in the Short Asymmetric Taylor-Couette Cavities at Low Reynolds Numbers, International Journal of Heat and Fluid Flow, 86 (2020), 12, pp. 1-22
  9. Kusumastuti, A., et al., Characterisation Study of Taylor-Couette Flow in Fluid Mixture of used Cooking Oil and Water, Journal of Advance Research in Fluid Mechanics and Thermal Sciences, 80 (2021), 2, pp. 106-114
  10. Fujii, T., et al., Frequency Analysis of Chaotic Flow in Transition to Turbulence in Taylor-Couette System with Small Aspect Ratio, Journal of Physics: Conference Series, Volume 801, International Conference on Computing and Applied Informatics, Medan, Indonesia, 801 (2016), 2, pp. 106-114
  11. Swann, P. B., et al., Taylor-Couette-Poiseuille Flow Heat Transfer in a High Taylor Number Test Rig, Journal of the Global Power and Propulsion Society, 5 (2022), Aug., pp. 126-147
  12. Qin, K., et al., Numerical Investigation on Heat Transfer Characteristics of Taylor Couette Flows Operating with CO2, Applied Thermal Engineering, 165 (2020), 25, pp. 287-298
  13. Xu, Z. Y., et al., Global Fluid Flow and Heat Transfer Characteristics Analysis of an Open Air-Cooled Drive Motor for Drilling Application, Case Studies in Thermal Engineering, 37 (2022), 102254
  14. Dong, H. H., et al., Performance of Air/Spray Cooling System for Large-Capacity and High-Power-Density, Applied Thermal Engineering, 192 (2021), 116925
  15. Smirnov, P. E., Menter, F. R., Sensitization of the SST Turbulence Model to Rotation and Curvature by Applying the Spalart-Shur Correction Term, Journal of Turbomachinery, 131 (2009), 4, 041010
  16. Tachibana, F., et al., Convective Heat Transfer of the Rotational and Axial Flow between Two Concentric Cylinders, Bulletin of JSME, 7 (1964), 26, pp. 385-391
PDF VERSION [DOWNLOAD]
Flow and heat transfer characteristics of high pressure natural gas in the gaps of high-speed motors with a high radius ratio

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence