Heat transfer coefficient distribution on the pole face of a hydrogenerator scale model

This paper focuses on the effect of rotation on heat transfer mechanisms in rotating machines with the purpose to improve the understanding of thermal phenomena and cooling of hydrogenerators. Using a simplified scale model equipped with a heated pole, it was possible to measure the temperature dist...

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Bibliographic Details
Published in:	Applied thermal engineering 2014-09, Vol.70 (1), p.153-162
Main Authors:	Torriano, F., Lancial, N., Lévesque, M., Rolland, G., Hudon, C., Beaubert, F., Morissette, J.-F., Harmand, S.
Format:	Article
Language:	eng
Subjects:	Applied sciences Asymmetry CFD Cooling effects Energy Energy. Thermal use of fuels Engineering Sciences Exact sciences and technology FEM Heat transfer Heat transfer coefficient Heat transfer coefficients Hydrogenerator Mechanics Poles Rotating machines Salient pole machine Scale models Theoretical studies. Data and constants. Metering Thermal engineering
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Summary:	This paper focuses on the effect of rotation on heat transfer mechanisms in rotating machines with the purpose to improve the understanding of thermal phenomena and cooling of hydrogenerators. Using a simplified scale model equipped with a heated pole, it was possible to measure the temperature distribution on the pole surface and to deduce, through numerical simulations, the heat transfer coefficients. The results show an asymmetric profile in the tangential direction since lower h values are found closer to the trailing edge due to the presence of a flow recirculation zone. Furthermore, the heat transfer profiles indicate that, although fans improve cooling at the top and bottom ends of the pole, the highest h values are found in an intermediate region. This is due to the flow from the fans that enters the interpole space and only after penetrating a certain distance in the axial direction it exits through the air gap and goes around the pole face. The study also shows that the heat transfer coefficients along the pole face at 300 rpm average about four times those at 50 rpm. •Temperature measurements and 3D simulations of the pole of a hydrogenerator scale model were done.•Lower heat transfer coefficient values are found closer to the trailing edge of the pole.•The highest heat transfer coefficient values are found in an intermediate region of the pole.•Heat transfer coefficients along the pole face at 300 rpm average about four times those at 50 rpm.
ISSN:	1359-4311