Nozzle with adjustable throat

The nozzle (20) has a collar (200) placed at inside a frame (21) in upstream of a shroud. The collar comprises two side walls (210, 220) assembled in a pivoting manner in the frame. The walls are connected with each other by two transverse rails (230, 240). Each rail is mounted on each side wall in a sliding manner. The side wall comprises panels (211, 212, 221, 222) connected to each other by mobile rotation axles (223, 231). The rails are mounted on one of the panel. The panel is fixed at a downstream end (2110) to the rotation axle integrated to another frame (214).