Studies on the Characteristics of Axial-Flow Pumps : Part 3,Flow before and behind Impellers of Several Different Types

概要

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In order to obtain the data, which are necessary to find the values of coefficients introduced in the analytical solutions on the theoretical characteristics of axial flow pumps, and to find the head loss at impeller blades, the velocity and energy distributions before and behind impeller blades, the pump characteristics and the pressure distributions on the casing wall near impeller blades are measured on 9 in. vertical axial flow pumps with the impellers of several different types. The results obtained are as follows. 1. The effects of the number of vanes, vane setting and vane profil on the impeller performance are revealed. 2. The width of a clearance between the impeller tips and the casing wall has little effect on the impeller performance at low flow rates.
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