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

Junjie Zhao, Bin Zhang, Xiaoli Fu and Shenglin Yan
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Junjie Zhao: College of Civil Engineering, Tongji University, Shanghai 200092, China
Bin Zhang: College of Civil Engineering, Tongji University, Shanghai 200092, China
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

Energies, 2021, vol. 14, issue 21, 1-17

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.

Keywords: vortex generator; arrangement; heat transfer; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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