CENTRIFUGAL COMPRESSOR IMPELLER WITH NON-LINEAR BLADE LEADING EDGE AND ASSOCIATED DESIGN METHOD Russian patent published in 2019 - IPC F04D29/28 

FIELD: non-displacement compressors and pumps.

SUBSTANCE: centrifugal compressor impeller 9 is disclosed. Impeller comprises a gas inlet and a gas outlet. Impeller also comprises disc 23 having blades 25 extending therefrom. Blades have leading edge 25L at the impeller inlet and trailing edge 25T at the impeller outlet, as well as a blade base extending along disc 23 between the leading edge and the trailing edge, a blade tip extending between the leading edge and the trailing edge opposite the disc, a pressure side and a suction side. Blades 25 have a three-dimensional curvature in a portion of the surface thereof, adjacent to leading edge 25L. Leading edge of each blade has a curved, non-linear profile in a meridian plane. Blade portion adjacent the leading edge has a double-curvature. Starting at leading edge 25L and for at least a portion of blade 25, each blade has a first metal angle distribution at the blade base, a second metal angle distribution at the blade tip and at least a third metal angle distribution at an intermediate location between the blade base and the blade tip, such that the suction side and pressure side are concave and convex, or vice-versa, depending on the shape of the leading edge.

EFFECT: each blade has a leading edge which is non-linear in the meridian plane, and a blade surface on both the suction side and the pressure side having a double curvature at least in a region adjacent the leading edge.

7 cl, 13 dwg