Leaned deswirl vanes behind a centrifugal compressor in a gas turbine engine

A deswirl assembly for receiving air flow from a diffuser, the deswirl assembly comprising:

• an annular housing including an inner annular wall, an outer annular wall disposed concentric to the inner annular wall, and a flowpath defined therebetween;
• a first plurality of vanes disposed in the flowpath in a substantially annular pattern, each vane having a leading edge, a trailing edge, a convex surface, and concave surface, each of the convex and concave surfaces extending between the leading and trailing edges, each vane extending between and angled relative to the inner and the outer annular walls such that the concave surface faces the outer annular wall and the convex surface faces the inner annular wall and each vane has an axial cross section shape, each axial cross section shape being substantially the same;
• and
• a second plurality of vanes disposed in the flowpath in a substantially annular pattern downstream of the first plurality of vanes, each vane having a leading edge, a trailing edge, a convex surface, and concave surface, each of the convex and concave surfaces extending between the leading and trailing edges, each vane extending between and angled relative to the inner and the outer annular walls such that the concave surface faces the outer annular wall and the convex surface faces the inner annular wall and each vane has an axial cross section shape, each axial cross section shape being substantially the same.

A system for aerodynamically coupling air flow from a centrifugal compressor to an axial combustor, the compressor and combustor disposed about a longitudinal axis, the system comprising:

• a diffuser having an inlet, an outlet and a flow path extending therebetween, the diffuser inlet in flow communication with the centrifugal compressor, and the diffuser flow path extending radially outward from the longitudinal axis;
• a deswirl assembly coupled to the diffuser and comprising:
• an annular housing including an inner annular wall, an outer annular wall disposed concentric to the inner annular wall, and a flowpath defined therebetween, the flow path in flow communication with the diffuser outlet to receive air flowing in a radially outward direction, and the deswirl assembly flow path configured to redirect the air in a radially inward and axial direction through the deswirl assembly outlet at an angle toward the longitudinal axis;
• and
• a plurality of vanes disposed in the flowpath in a substantially annular pattern, each vane having a leading edge, a trailing edge, a convex surface, and concave surface, each of the convex and concave surfaces extending between the leading and trailing edges, each vane extending between and angled relative to the inner and the outer annular walls such that the concave surface faces the outer annular wall and the convex surface faces the inner annular wall;
• a combustor inner annular liner disposed about the longitudinal axis, the inner annular liner having an upstream end;
• a combustor outer annular liner disposed concentric to the combustor inner annular liner and forming a combustion plenum therebetween, the outer annular liner having an upstream end;
• a combustor dome coupled to and extending between the combustor inner and outer annular liner upstream ends;
• and
• a curved annular plate coupled to the combustor inner and outer annular liner upstream ends to form a combustor subplenum therebetween, the curved annular plate having a first opening and a second opening formed therein, the first opening aligned with the deswirl assembly outlet to receive air discharged therefrom.