Control mechanism for expansion section of two-dimensional nozzle

The invention relates to the field of aero-engines, in particular to a control mechanism for an expansion section of a two-dimensional nozzle, which is arranged between a round-to-square section and an expansion adjusting piece and comprises an actuator cylinder mounting seat, a hydraulic actuator cylinder and a lug seat, wherein a supporting seat is arranged on the outer ring face of the round-to-square section, and the actuator cylinder mounting seat is arranged at the end, close to one end of a convergence adjusting piece, of the supporting seat; the lug seat is arranged on the expansion adjusting piece, the bottom of the hydraulic actuator cylinder is matched with the actuator cylinder mounting seat in a hinged mode, and a piston rod of the hydraulic actuator cylinder is matched with the lug seat in a hinged mode. The control mechanism has the technical effect that the expansion adjusting piece can be stably and rapidly adjusted. 本申请涉及航空发动机领域，为一种二元喷管扩张段控制机构，设于圆转方段与扩张调节片之间，包括作动筒安装座、液压作动筒和耳座，所述圆转方段外环面上设有支撑座