Non-axisymmetric hub and shroud profile for electric submersible pump stage

An electric submersible pump (ESP) comprising a plurality of stages, at least one of the plurality of stages comprising:

• an impeller;
• and
• a diffuser, at least one of the impeller and the diffuser comprising a non-axisymmetric profile,
• wherein a Z-axis extends axially through the stage and the non-axisymmetric profile includes at least one surface normal vector including a positive Z-component and at least one surface normal vector including a negative Z-component.

A method of manufacturing a stage for an electric submersible pump (ESP), the method comprising:

• providing tooling for forming an impeller or a diffuser, the impeller or the diffuser comprising:
• a blade including a pressure side and a suction side, wherein a height of the pressure side of the blade is different than a height of the suction side of the blade;
• and
• a non-axisymmetric profile, wherein the non-axisymmetric profile extends less than 100% of a Meridional Length from a leading edge to a trailing edge of the blade in a streamwise direction;
• forming a sand core about the tooling;
• and
• removing the sand core from the tooling by pulling the sand core with a purely axial movement along a positive Z-axis.