Gas turbine engine with forward swept outlet guide vanes

A turbofan engine defining an axial direction and a longitudinal centerline along the axial direction, the turbofan engine comprising:

• a fan section having a fan;
• a turbomachine drivingly coupled to the fan, the turbomachine comprising an outer casing;
• an outer nacelle surrounding the fan and at least a portion of the turbomachine, the turbofan engine defining a bypass passage between the outer nacelle and the turbomachine;
• an outlet guide vane extending between the turbomachine and the outer nacelle, the outlet guide vane defining a base and a tip and being forward swept from the base to the tip, wherein the outlet guide vane defines a junction with the outer casing at a leading edge of the outlet guide vane;
• and
• a plurality of acoustic treatments attached to or integrated with the outer casing including a first acoustic treatment at a location aligned with the outlet guide vane along the longitudinal centerline, and at least one second acoustic treatment disposed forward of the junction.