Axisymmetric convergent-divergent spray pipe

The invention belongs to the field of aviation gas turbines, and particularly relates to an axisymmetric convergent-divergent spray pipe, a plurality of actuating cylinders are installed on the outer side of the axisymmetric convergent-divergent spray pipe in the circumferential direction, and actuating shafts of the actuating cylinders are hinged to the same adjusting ring; the rear end of the cylinder body is hinged with convergence adjusting sheets which are distributed in the circumferential direction, and the rear end of each convergence adjusting sheet is hinged with an expansion adjusting sheet; a plurality of fixed pull rods are hinged to the outer side of the barrel in the circumferential direction, the fixed pull rods are hinged to the same supporting ring, an outer adjusting piece is hinged to the rear end of the expansion adjusting piece through a cylindrical pair, the other end of the outer adjusting piece is hinged to the supporting ring, and the expansion adjusting piece is hinged to the suppor