Abstract: A turbofan engine uses fan air to cool bounding surfaces of the exhaust duct at all times. A portion of the fan air flow is used for augmentor combustion in the augmentation mode. In the non-augmented mode the flow for combustion is stopped and the cooling air is used to cool the tail cone and exit guide vanes. Infrared radiation is thereby reduced when non-augmented.

Abstract: A flameholder stabilization plate attaches to the lower part of a flameholding baffle disposed in an afterburner system of a turbofan engine. The plate includes extension tabs which extend laterally from a main body of the plate and block contact by cool fuel droplets entrained in a cold fan air stream flow with the baffle. The tabs disperse some large droplets into smaller ones which flow to a recirculation flame zone behind the baffle where a leaner fuel-air mixture is formed. Other large droplets of fuel are directed by the tabs to combustion zones at lateral sides of the baffle where a richer fuel-air mixture is formed. The leaner mixture in the recirculation zone will result in a more stable flame which, in turn, will more efficiently burn the richer mixture of fuel in the lateral combustion zones.

Abstract: An afterburner on a turbofan engine includes a flameholder means having an annular flameholder gutter positioned downstream of a first exhaust means of a core engine while said flameholder means also includes a plurality of radial gutter sections extending radially outward towards an outer wall of said afterburner and downstream of a second annular exhaust means of a bypass duct around said core engine; a plurality of said radial gutter sections having a manifold extending along the forward portion thereof, each manifold having an inlet at its inward end located downstream of said first exhaust means with said manifold directing a hot exhaust flow from said inlet to openings on each side of its associated radial gutter section in a portion downstream of said second annular exhaust means.