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Radially resolved measurement of stator heat transfer in a rotor-stator disc system

Howey, D. A., Holmes, A. S. & Pullen, K. R. (2010). Radially resolved measurement of stator heat transfer in a rotor-stator disc system. International Journal of Heat and Mass Transfer, 53(1-3), pp. 491-501. doi: 10.1016/j.ijheatmasstransfer.2009.09.006


This paper describes a new experimental method for measuring stator heat transfer in a rotor–stator disc system using an electrical heater array. The system is partially blocked at the periphery, with radial outflow of rotor-pumped air from an inlet at stator centre. The aim is to improve thermal performance prediction for air-cooled disc type electrical machines. Local Nusselt numbers were measured for 0.6<r/R<1 at three non-dimensional gap ratios G=g/R=(0.0106,0.0212,0.0297) and rotational Reynolds numbers 3.7e4⩽Reθ⩽5.6e5. Transition at the stator is observed to occur at Reθ>3e5 for all gap ratios. Increased Nusselt numbers at the periphery are observed for all Reθ and G because of the ingress of ambient air along the stator due to the rotor pumping effect.

Publication Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Heat and Mass Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Mass Transfer, Volume 53, Issues 1–3, 15 January 2010, Pages 491–501,
Publisher Keywords: Heat transfer; Heat flux gauge; Convection; Rotor stator; Axial flux permanent magnet machine
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering
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