An integrally formed tail nozzle structure

Abstract

An integrally formed tail nozzle structure, including a reinforcing ring, a circumferential reinforcing rib, an inner skin, a foam sandwich assembly and an outer skin, wherein the reinforcing ring and the circumferential reinforcing rib are arranged inside the inner skin, and the outer skin is arranged on The outer side of the inner skin, and the reinforcing ring, the circumferential reinforcing rib, the inner skin and the outer skin are thermally fused through the carbon fiber fabric sheet to form a preformed carbon fiber fabric layup; the foam sandwich assembly is placed in the preformed body of the carbon fiber fabric layup, The tail nozzle preform assembly is formed by hot melting, and the tail nozzle preform assembly is then formed through an RTM molding process to obtain an integrally formed tail nozzle structure. The invention has a high degree of integration, can not only reduce the weight of the tail nozzle structure, control the deformation of the tail nozzle structure, but also effectively improve the shape accuracy and surface quality, and reduce the number of parts and mechanical connections, thereby reducing the difficulty of assembly and directly reducing the manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of aircraft structures, in particular to an integrally formed tail nozzle structure. Background technique [0002] The engines of light military aircraft such as fighter jets, attack planes and trainer planes are generally installed in the rear fuselage, so the tail nozzle structure of this type of aircraft is located at the tail of the fuselage, only affected by the aerodynamic load on the outer surface and the mass force of the structure itself, The nozzle is often arranged with an inner skin due to the rectification of the ejected airflow in the engine compartment, and the outer skin meets the needs of the aircraft's aerodynamic shape. The tail nozzle generally adopts an aluminum alloy thin-walled riveted structure. In order to meet the requirements of sufficient strength, rigidity, manufacturability and maintainability of the tail nozzle during design, the inner and outer skins are often manufactured and...

AI Technical Summary

Problems solved by technology

The tail nozzle generally adopts an aluminum alloy thin-walled riveted structure. In order to meet the requirements of sufficient strength, rigidity, manufacturability and maintainability of the tail nozzle during design, the inner and outer skins are often manufactured and connected in sections, and the reinforcement rings and rings are arranged accordingly. There are many parts such as ribs, longitudinal partitions, profiles, connecting pieces, and grooved ribs; therefore, there are disadvantages such as large number of parts, heavy riveting workload, easy deformation, and heavy structure. In order to reduce the weight of the tail nozzle, a thin inner skin is used. , Outer skin, due to the poor rigidity of the inner skin and outer skin, it is easy to lead to poor shape accuracy and surface quality of the tail nozzle structure

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