Contoured shroud swirling pre-mix fuel injector assembly

A fuel injector assembly of a gas turbine engine, comprising:

• a centerbody defining an outer surface;
• an outer sleeve surrounding the centerbody, wherein a section of the outer sleeve comprises a radially oriented vane, wherein the outer sleeve defines an inner surface, and further wherein the inner surface of the outer sleeve and the outer surface of the centerbody together define an annular circuit defining a decreasing cross sectional area from a first location to a second location downstream of the first location;
• an inner sleeve disposed between the centerbody and at least a section of the outer sleeve, wherein a portion of the inner sleeve comprises a contoured shroud, wherein the contoured shroud defines a plurality of lobes, and wherein the inner sleeve and a portion of the outer sleeve defines a fuel injection port disposed upstream of the contoured shroud, wherein the inner sleeve is disposed at least partly upstream of the radially oriented vane;
• and
• an axially oriented vane defined between the centerbody and a section of the inner sleeve, wherein the axially oriented vane is disposed upstream of the fuel injection port.