Abstract
An existence of a back-flow on the suction side of impeller blades of turbomachines and its remarkable effects on the characteristics have been admitted as well known facts. But its cause and mechanism are scarcely clarified. In this paper, such problems were treated by measuring the pressure distributions and flow directions in the passage between two blades, on the outside of three different axial-flow impellers, which had a big scale back-flow. As the result, it was discovered that the back-flow was regarded as the separation of flow from the surface of blades, due to the increase of discharge around the leading edge, which was divided by the stagnation stream line, on the outside of impeller blades. Furthermore, the unstable performance of head-discharge curve and the conspicuous increase of shut-off horsepower were also discussed in this paper.
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