After burner

An afterburner installation for a gas turbine engine including an expansion turbine from which, in operation, there is discharged a high-velocity high-temperature exhaust gas flow, which installation comprises an afterburner duct located downstream of such expansion turbine, through which duct the exhaust gas flow passes, a source of afterburner fuel, and at least one hollow structure arranged within the afterburner duct in order to be in a heat transfer relationship with the high-velocity high-temperature exhaust gas flow; such hollow structure, having its interior connected to the fuel source and comprising an entry portion with an intake orifice facing upstream relative to the direction of exhaust gas flow and through which a fraction from the exhaust gas flow is collected and penetrates into the interior of such hollow structure, the intake portion extending in the longitudinal direction of the afterburner duct, and a discharge portion comprising at least one exit orifice through which a high-temperature jet of a fuel/gas mixture escapes from the hollow structure and enters the afterburner duct where it spontaneously ignites and forms a stabilised flame front, such discharge portion extending transversely of the longitudinal direction of the duct and such exit orifice or orifices facing downstream relative to the direction of the exhaust gas flow in the afterburner duct.