Research on the Flow in a Centrifugal Pump Impeller : 4 th Report, A Contribution to the Theory of Semi-Axial Pump Impeller

Abstract

In the semi-axial pump impeller, the fluid flows on the conical surface and the breadth of the flow path is not constant usually. In this report the author has treated such cases in which the inclination of the flow path and the variation of impeller breadth are small, and the shape of blade is nearly flat. In such cases the flow can be analysed by taking the flow of an axial pump impeller with flat plate blades as a basis, and adding together the effects of the inclination of the flow path, the effect of the breadth variation, and the effect of blade camber. The author has analysed these effects by applying the method of complex velocity function presented in 1st Report, the method of generalised displacement flow introduced in 2nd Report, and the method of series expansion mentioned in 3rd Report.