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A multistage centrifugal impeller in which each blade row is individually matched to optimum efficiency characteristics in a manner which minimizes blade lean. Each blade row is composed of twisted blades which substantially equalize working fluid diffusion from blade root to blade tip while restrai

A multistage centrifugal impeller in which each blade row is individually matched to optimum efficiency characteristics in a manner which minimizes blade lean. Each blade row is composed of twisted blades which substantially equalize working fluid diffusion from blade root to blade tip while restraining blade lean to less than 15°.

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A method of compressing a fluid flow and transforming said fluid flow from an axial to a centrifugal flow in a centrifugal compressor, which comprises the steps of: (a) compressing the fluid in an optimized axial manner at a first blade row including blades each having a root and a tip, and (b) furt

A method of compressing a fluid flow and transforming said fluid flow from an axial to a centrifugal flow in a centrifugal compressor, which comprises the steps of: (a) compressing the fluid in an optimized axial manner at a first blade row including blades each having a root and a tip, and (b) further compressing the fluid in an exit blade row with an optimized centrifugal exit, said exit blade row including blades each having a root and a tip, (c) the fluid flow being diffused at a substantially equalized rate along blade height from said roots to said tips of said blades of both said first and exit blade rows as the fluid proceeds from said first blade row and through said exit blade row.