Centrifugal compressor/pump with fluid dynamically variable geometry diffuser

Abstract From the Canadian patent

Abstract of the Disclosure, A centrifugal compressor has a diffuser with fixed vane geometry which provides significantly increased range, as compared to conventional fixed geometry diffusers, by developing what appear to be flow accelerating stall bubbles in the diffuser throat that forestall the onset of surge in the portion of the operating range near and approaching the surge point. The stall bubbles are created by fixing the suction sides of the vanes, relative to the flow impinging upon their leading edges at angles slightly more radial than is conventional, thereby creating higher than normal angles of incidence with the flow delivered by the impeller.