DISPOSITIF DE REFROIDISSEMENT DE LA TUYERE COMMUNE SUR UNE NACELLE

摘要

The double flow turbojet comprises an engine (5) completely housed in a nacelle (4) whose internal wall (12) delimits with the engine casing (13) an annular passage (11) in which a secondary flow (10) delivered by a fan (14) flows. The nacelle has an air inlet (6) upstream of the engine, power inversion means (20) in its median section and a common exhaust nozzle (7) for the primary (9) and secondary flows whose outlet (8) is located downstream of the engine. The power inversion means can take an active position where the secondary flow is diverted to the outside and to the front of the nacelle. The exhaust nozzle comprises an enclosure delimited by the internal (30) and external walls of the nozzle. Cooling of the nozzle when the power inversion is in the active position is obtained by a scoop for withdrawing cooling air flow which is led into the enclosure and multi-perforations for forming a cooling air film on the nozzle internal wall.