A New Axisymmetric Plug Nozzle

Abstract

The invention relates to the field of the design of nozzles of aero-engines, in particular to a novel axial symmetry plug nozzle. The novel axial symmetry plug nozzle comprises a barrel, a plug cone front section, a plug cone rear section, supporting plates, actuator cylinders, levers and connecting rods, wherein the front section of the barrel is a cylindrical flat section, the rear section of the barrel is a contraction section, the plug cone front section is located inside the barrel, the internal profile of the rear end of the plug cone front section is a cylindrical surface, the front end of the plug cone rear section is provided with the external profile matched with the internal profile of the rear end of the plug cone front section in shape and size, a sliding pair is formed by the external profile of the front end of the plug cone rear section and the internal profile of the plug cone front section, the supporting plates are each of a hollow structure, one end of each supporting plate is fastened to the barrel, the other end of each supporting plate is fixed to the plug cone front section, the actuator cylinders are hinged to the outside of the barrel, the levers are arranged in the inner cavities of the supporting plates in a hinged manner, one end of each lever is hinged to the corresponding actuator cylinder, the connecting rods are located in the inner cavity of the plug cone front section, one end of each connecting rod is hinged to the corresponding lever, and the other end of each connecting rod is hinged to the end, close to the plug cone front section, of the plug cone rear section. The novel axial symmetry plug nozzle is simple and reliable in structure, the area of a throat can be effectively adjusted, and the requirements on different working states of an engine are met.

Description

technical field [0001] The invention relates to the field of aircraft engine nozzle design, in particular to an axisymmetric plug nozzle. Background technique [0002] Axisymmetric plug nozzles have broad application prospects in aero-engines, and throat area adjustment is a basic function they should possess. There are generally three ways to adjust the throat area of ​​the existing axisymmetric plug nozzle: one is to move the plug cone back and forth as a whole, which requires the overall movement of the plug cone, which requires higher control mechanism and control force; the other is to move the nozzle The outer cover of the pipe, this method also faces the problems of control mechanism and control force; the third is to design an adjustable convergence section at the rear end of the nozzle barrel, and realize the adjustment of the throat area by controlling the convergence section. This method has a complicated structure , the weight has also increased significantly, a...

AI Technical Summary

Problems solved by technology

There are generally three ways to adjust the throat area of ​​the existing axisymmetric plug nozzle: one is to move the plug cone back and forth as a whole, which requires the overall movement of the plug cone, which requires higher control mechanism and control force; the other is to move the nozzle The outer cover of the pipe, this method also faces the problems of control mechanism and control force; the third is to design an adjustable convergence section at the rear end of the nozzle barrel, and realize the adjustment of the throat area by controlling the convergence section. This method has a complex structure , the weight has also increased significantly, and with the complexity of the structure, its reliability has also decreased accordingly

Images