Studies on the Characteristics of Axial-Flow Pumps : Part 2,Analytical Method of Determining the Discharge-Theoretical Head Characteristics

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In this paper, the flow in an axial-flow pump impeller at partial flow rates is studied by dividing it into two domains ; one is near the casing wall where the radial flow is seriously affected by the wall, another is far from it where the fluid flows along impeller blades and the effect of the wall is negligibly small. By considering about the flow in impeller blades in this way, it becomes possible to analyse an impeller action and to demonstrate the reason for the conspicuous increase of the head at partial quantities. The analytical method to find the relation between the discharge and the theoretical head is obtained. But the complexity of the flow makes it necessary to introduce some coefficients, which should be determined empirically.
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