抄録
Toward the improvement of performance of the air-cooled generator, design of the generator appropriate to heat removal is important. An air-cooled generator is composed of the pair of coaxial cylinders with the fixed outer cylinder (stator) and rotating inner cylinder (rotor). The present study experimentally and numerically clarifies the flow characteristics in rotating coaxial cylinders simulated a salient-pole rotor within the air-cooled generator. The flow behavior in the slot between the salient-poles was measured via PIV. The velocity fields were obtained by the numerical simulation. In flow visualization, we proposed a transformation method from absolute coordinate to rotational one in order to obtain the velocity fields in rotational coordinate. The vortex structure was observed in the slot on the rotor wall. In the numerical simulation, the same vortex structure as flow visualization was identified, and the numerical simulation was validated by comparing the velocity profiles obtained numerically and those obtained experimentally.
