Rotary turbomachine having a transonic compressor stage

A rotary machine having a compressor stage adapted for operation under transonic flow conditions, comprising a hub, a plurality of blades respectively extending radially outwardly from said hub, and a cylindrical housing arranged radially outwardly around said blades;

• wherein each one of said blades has a pressure side adapted to cause fluid flow therealong at a higher relative pressure and a suction side adapted to cause fluid flow therealong at a lower relative pressure;
• wherein at least one of said hub and said housing has a circumferential surface with a sectional profile that varies around a circumference thereof, said sectional profile has a respective pressure side contour adjacent each one of said blades respectively on said pressure side thereof, and said sectional profile has a respective suction side contour adjacent each one of said blades respectively on said suction side thereof which is different from said pressure side contour;
• and
• wherein each said pressure side contour comprises a first concave contour, and each said suction side contour comprises one of a second concave contour that is less concave than said first concave contour, and a linear contour.

A rotary machine having a compressor stage adapted for operation under transonic flow conditions, comprising a hub, a plurality of blades respectively extending radially outwardly from said hub, and a cylindrical housing arranged radially outwardly around said blades;

• wherein each one of said blades has a pressure side adapted to cause fluid flow therealong at a higher relative pressure and a suction side adapted to cause fluid flow therealong at a lower relative pressure;
• wherein at least one of said hub and said housing has a circumferential surface with a sectional profile that varies around a circumference thereof, said sectional profile has a respective pressure side contour adjacent each one of said blades respectively on said pressure side thereof, and said sectional profile has a respective suction side contour adjacent each one of said blades respectively on said suction side thereof which is different from said pressure side contour;
• wherein each said pressure side contour comprises a first concave contour, and each said suction side contour comprises one of a second concave contour that is less concave than said first concave contour, a linear contour, a convex contour, and a combination convex/concave contour;
• wherein said sectional profile includes two profile portions that are circumferentially uniform and continuous;
• and
• wherein each said pressure side contour further comprises two transition contours that are respectively located at axially opposite ends of said first concave contour and that smoothly transition from said first concave contour into said two profile portions.

A rotary machine having a compressor stage adapted for operation under transonic flow conditions, comprising a hub, a plurality of blades respectively extending radially outwardly from said hub, and a cylindrical housing arranged radially outwardly around said blades;

• wherein each one of said blades has a pressure side adapted to cause fluid flow therealong at a higher relative pressure and a suction side adapted to cause fluid flow therealong at a lower relative pressure;
• wherein at least one of said hub and said housing has a circumferential surface with a sectional profile that varies around a circumference thereof, said sectional profile has a respective pressure side contour adjacent each one of said blades respectively on said pressure side thereof, and said sectional profile has a respective suction side contour adjacent each one of said blades respectively on said suction side thereof which is different from said pressure side contour;
• wherein each said pressure side contour comprises a first concave contour, and each said suction side contour comprises one of a second concave contour that is less concave than said first concave contour, a linear contour, a convex contour, and a combination convex/concave contour;
• wherein said circumferential surface, as seen on a radial section plane, has a respective smooth transition from each said first concave contour to a respective adjacent one of said suction side contours;
• and
• wherein said smooth transition comprises one of:
• (a) a radially outward slope that slopes radially outwardly from a minimum radius at said first concave contour to a maximum radius at said suction side contour,
• (b) a substantially linear slope transitioning between a first extreme radius of said first concave contour to a second extreme radius of said suction side contour;
• and
• (c) a concave curvature followed by a convex curvature transitioning from said first concave contour to said suction side contour.

A rotary machine having a compressor stage adapted for operation under transonic flow conditions, comprising a hub, a plurality of blades respectively extending radially outwardly from said hub, and a cylindrical housing arranged radially outwardly around said blades;

• wherein each one of said blades has a pressure side adapted to cause fluid flow therealong at a higher relative pressure and a suction side adapted to cause fluid flow therealong at a lower relative pressure;
• wherein at least one of said hub and said housing has a circumferential surface with a sectional profile that varies around a circumference thereof, said sectional profile has a respective pressure side contour adjacent each one of said blades respectively on said pressure side thereof, and said sectional profile has a respective suction side contour adjacent each one of said blades respectively on said suction side thereof which is different from said pressure side contour;
• and
• wherein said hub is a non-rotatable stator hub, said housing is a non-rotatable housing, said blades are connected at radially inner ends thereof to said hub and are connected at radially outer ends thereof to said housing, and said circumferential surface is a radially inward surface of said housing.

A rotary machine having a compressor stage adapted for operation under transonic flow conditions, comprising a hub, a plurality of blades respectively extending radially outwardly from said hub, and a cylindrical housing arranged radially outwardly around said blades;

• wherein each one of said blades has a pressure side adapted to cause fluid flow therealong at a higher relative pressure and a suction side adapted to cause fluid flow therealong at a lower relative pressure;
• wherein at least one of said hub and said housing has a circumferential surface with a sectional profile that varies around a circumference thereof, said sectional profile has a respective pressure side contour adjacent each one of said blades respectively on said pressure side thereof, and said sectional profile has a respective suction side contour adjacent each one of said blades respectively on said suction side thereof which is different from said pressure side contour;
• and
• wherein each said pressure side contour comprises a first concave contour, and each said suction side contour comprises one of a convex contour and a combination convex/concave contour.