WAKE REDUCTION STRUCTURE FOR ENHANCING CAVITY FLOW IN GENERATOR ROTOR ENDWINDING

摘要

A gas cooled dynamoelectric machine is provided that is comprised of a rotor 10, a rotor winding comprising axially extending coils 22 and concentric endwindings 28, and a plurality of spaceblocks 140 located between adjacent endwindings 28 thereby to define a plurality of cavities 142, each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns of the field endwinding region, at least one spaceblock has a trailing edge or downstream wall 146 contoured to reduce generated wake. In a preferred embodiment, the trailing edge has an aerodynamic contour to reduce the extent and strength of the generated wake (FIG. - 1)