Internal structure of a primary exhaust duct having a separator of which the geometry varies depending on the temperature

A turbomachine having a primary exhaust duct bounded outwardly by a primary nozzle and inwardly by an internal structure of the primary exhaust duct of the turbomachine, said internal structure comprising:

• a primary wall comprising a plurality of holes and a surface of revolution about a longitudinal axis, allowing air to pass through the plurality of holes and forming an internal surface of the primary exhaust duct,
• an interior skin comprising a surface of revolution about the longitudinal axis, arranged inside the primary wall, and
• a separator having a first edge, the separator attached only to the interior skin and only by a region along the first edge, the separator capable of changing from a first geometry to a second geometry,
• wherein a change from the first geometry to the second geometry takes place when a temperature of the separator exceeds a first temperature, and a change from the second geometry to the first geometry takes place when the temperature of the separator drops below a second temperature less than or equal to the first temperature,
• wherein a coefficient of expansion of the separator is greater than that of the interior skin,
• wherein, in the first geometry, the separator is wound on itself,
• wherein, in the second geometry, the separator is unwound and fully extends so as to bring a second edge of the separator adjacent to the primary wall, and
• wherein a gap is maintained between the separator and the primary wall at all times.

An aircraft having a turbomachine having a primary exhaust duct bounded outwardly by a primary nozzle and inwardly by an internal structure of the primary exhaust duct of the turbomachine, said internal structure comprising:

• a primary wall comprising a plurality of holes and a surface of revolution about a longitudinal axis, allowing air to pass through the plurality of holes and forming an internal surface of the primary exhaust duct,
• an interior skin comprising a surface of revolution about the longitudinal axis, arranged inside the primary wall, and
• a separator having a first edge, the separator attached only to the interior skin and only by a region along the first edge, the separator capable of changing from a first geometry to a second geometry,
• wherein a change from the first geometry to the second geometry takes place when a temperature of the separator exceeds a first temperature, and a change from the second geometry to the first geometry takes place when the temperature of the separator drops below a second temperature less than or equal to the first temperature,
• wherein a coefficient of expansion of the separator is greater than that of the interior skin,
• wherein, in the first geometry, the separator is wound on itself,
• wherein, in the second geometry, the separator is unwound and fully extends so as to bring a second edge of the separator adjacent to the primary wall, and
• wherein a gap is maintained between the separator and the primary wall at all times.