Abstract
Radial fan is mainly used as a motor cooling fan for railway vehicle and industrial use. This fan is low efficiency compared with axial flow fan, and the windage loss is large. In recent years, the high output and totally enclosed motor is increasing, and totally enclosed motor with external cooling fan is increasing especially. However, the rate of a windage loss increases at the time of a high rotation speed, and lowers efficiency. Although it is mathematized experimentally and is grasped quantitatively about windage loss of the rotating disk, the fan with blades is not generalized for the complexity of form. This paper describes the result evaluated by CFD about windage loss and mass flow.
