Complex flow and heat transfer between outer and slotted inner cylinders in an electrical rotating machine

Abstract

Toward the improvement of performance of the air-cooled generator, an appropriate design for the heat removal is important. The present study numerically clarifies the flow behavior and heat transfer characteristics in rotating coaxial cylinders simulated a salient-pole rotor within the air-cooled generator. The same vortex structure as flow visualization was identified. Heat transfer coefficient on the trailing side wall near separated flow was lower than that on the leading side wall. It is implied that temperature on the wall near separated flow increased because of flow congestion at separated flow region.