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A method for selecting the optimum principal dimensions of a centrifugal impeller (under a specified set of constraints) is described. The proposed procedure is based on maximizing the overall isentropic efficiency for a given set of design requirements (mass flow rate and pressure ratio). Numerical optimization technique, for solving non-linear programming problems, has been used to solve a design objective function. The results have shown that a quicker and more accurate estimation of impeller overall dimensions is achieved. Furthermore, it should not be difficult to re-structure the proposed program so that the preliminary optimization of the complete stage might be carried out.

The paper describes a general method, based on a simplified flow model, for the analysis of compressible, unseparated and non-uniform flows in diffusing ducts of arbitrary geometry and inlet flow conditions. The method has been tested against available detailed experimental data of conical and straight rectangular diffusers, and was able to predict (with an acceptable degree of accuracy) the likely performance of diffusing flows at various values of inlet Mach numbers.