US Patent 11391296 Diffuser pipe with curved cross-sectional shapes

A diffuser pipe has a tubular body extending from an inlet to an outlet and increasing in cross-sectional area from the inlet toward the outlet. The outlet has a radially inner wall, a radially outer wall, and side walls joining the radially inner wall to the radially outer wall. The outlet has an elliptigon shape in which both the radially inner wall and the radially outer wall are curved. A radius of curvature of the radially outer wall is different from a radius of curvature of the radially inner wall.