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A centrifugal compressor or pump has a vaneless diffuser within which a radially extending passage is formed between a fixed plate surface and a profile contoured shroud surface establishing a pinch point location of minimum passage area intermediate inlet and outlet ends of the diffuser passage. Co

A centrifugal compressor or pump has a vaneless diffuser within which a radially extending passage is formed between a fixed plate surface and a profile contoured shroud surface establishing a pinch point location of minimum passage area intermediate inlet and outlet ends of the diffuser passage. Convergent and divergent flow portions of the diffuser passage respectively extend to and from the pinch point to establish continuous convergent flow from the inlet end and divergent flow toward the outlet end for exit outflow at a flow angle less than that of a convergent inflow angle from the inlet end imposed along an initial profile segment.

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1. In combination with a compressor having power driven impeller means inducing axial inflow of fluid along a rotational axis for outflow directed radially outward into a vaneless diffuser having two surfaces extending radially between inlet and outlet ends of a flow passage of predetermined length

1. In combination with a compressor having power driven impeller means inducing axial inflow of fluid along a rotational axis for outflow directed radially outward into a vaneless diffuser having two surfaces extending radially between inlet and outlet ends of a flow passage of predetermined length formed between said surfaces, the improvement residing in: one of said surfaces having a shape contoured profile extending between the inlet and outlet ends of the flow passage which includes: a pinch point located between the inlet and outlet ends establishing thereat a minimum passage area of the flow passage between the two surfaces; convergent and divergent profile portions respectively extending from the inlet end to the pinch point and from the pinch point toward the outlet end; and an exit portion of the flow passage extending between said divergent profile portion and the outlet end at an outflow angle smoothing outflow discharge from the outlet end.