抄録
The Flow distribution throughout the passage of the rotating impeller has been studied in detail about two types of the impellers, one is with radial-straight blades and the other is with logarithmic-spiral blades, and the results are presented in the form of relative velocity and direction of flow. In the former case, it is measured by changing numbers of rotation and flow factor, and is compared with the results of two-dimensional potentional theory which has been published. From this results, it is underatood that the flow in the impeller cannot be conjectured by the theories. The real flow at the experiment, especially when flow factor is large, it flows through the impeller with nearly the same angle with the entrance flow angle, and the region of the slowest velocity occurrs at the blade negative side. In the latter case, the flow is comparatively along the blades. The velocity distributions and direction of flow indicate that secondary flows in the boundary layer tend to shift the low-energy air toward the blade negative surface within the passage. There is a counter effect at the casing surfade apparently caused by leakage through the blade to casing clearance space. This results a vortex flow in the passage.
