Major design considerations involved in selecting geometries for high-pressure ratio, single-stage centrifugal compressors are discussed. The results of a parametric study are included to indicate optimum regions of design, and to project the potential performance of centrifugal compressors with rotating diffusers. Several different candidate design solutions are evaluated on the basis of providing improved performance at high pressure ratios consistent with maintaining the inherent simplicity and low-cost features of centrifugal compressors.

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