A Study on the Flow in a Centrifugal Impeller with Passages of Circular-Arc in Meridional Plane

概要

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The flow in an impeller is affected by the incidence angle. The impellers used in this experiment are of three types ; two of which have constant passage height, but one is with an inducer and another is without, and the other has a constant sectional area all the way from inlet to outlet, but without any inducer. The influence of incidence angle on the flow in the impeller has been measured by the kiel probe and the yaw-meter that rotate with the impeller. From this result, it has been recognized that the separation of the flow occurs at the triangle-area that is bounded by the trailing face of blade and the shroud. The pressure distribution on the blade face that has been measured in the experiments is compared with that of the two-dimensional theory. This theory is found to be in comparatively good agreement except for the region near the leading edges of the blades with the experimental results ; that is, the pressure on the blade face is influenced by the main flow only, and it is hardly affected by the secondary flows that complicate the flow through the impeller.
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