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Taylor-Couette flow and transient heat transfer inside the annulus air-gap of rotating electrical machines
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (FEC, Track 3, Modeling and Simulation)ORCID iD: 0000-0002-9490-9703
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0001-8849-7661
ABB AB, Corporate Research, Sweden.
2017 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 207, p. 624-633Article in journal (Refereed) Published
Abstract [en]

Losses in an electric motor amount to between 4–24% of the total electrical power, and are converted to heat. The maximum hot spot temperature is one of the design constraints of thermal and electrical performance. Several studies have explored flow and thermal characteristics inside the air-gap between two concentric rotating cylinders such as those found in electric motors, however the transient flow and thermal effects still remain a challenge. This study uses Computational Fluid Dynamics to predict the thermal behaviour of a machine rotating at the kind of speed usually encountered in motors. The Reynolds Averaged Navier-Stokes model together with the realizable k-ε turbulence model are used to perform transient simulations. Velocity profiles and temperature distribution inside the air-gap are obtained and validated. The transient flow features and their impact on thermal performance are discussed. The numerical results show turbulent Taylor vortices inside the air-gap that lead to a periodic temperature distribution. When compared to correlations from published literature, the simulated average heat transfer coefficient at the rotor surface shows overall good agreement. The transient effects introduce local impacts like oscillations to the Taylor-Couette vortices. These flow oscillations result in oscillations of the hotspots. However, this transient oscillatory behaviour does not show any additional impact on the global thermal performance.

Place, publisher, year, edition, pages
2017. Vol. 207, p. 624-633
Keyword [en]
Air-gap, Rotating electrical machines, CFD simulation, Thermal analysis, Motor simulation, Taylor vortices
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-37476DOI: 10.1016/j.apenergy.2017.07.011ISI: 000417229300055Scopus ID: 2-s2.0-85024104684OAI: oai:DiVA.org:mdh-37476DiVA, id: diva2:1167113
Available from: 2017-12-18 Created: 2017-12-18 Last updated: 2018-01-23Bibliographically approved

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Publisher's full textScopushttps://www.sciencedirect.com/science/article/pii/S0306261917308711

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Hosain, Md LokmanBel Fdhila, Rebei

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