The paper proposes a design method which may be used to evaluate the impeller detailed geometry for a prescribed mean stream velocity distribution. The analysis makes extensive use of numerical optimization, firstly in the step by step channel geometry calculation, and secondly in controlling the manner in which the relative velocity components are permitted to vary along the mean streamline for the condition of minimum entropy generation along the flow path. It should be mentioned that the components of the relative velocity were not allowed to take arbitrary values. The variation of the radial, axial and tangential components was governed in such a way that the prescribed diffusion schedule is satisfied at every point.

An example impeller is shown, which was designed using the proposed method. The general configuration of the example design shows it to be not difficult to manufacture.

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