A method for preparing a small-sized air inlet structure

Abstract

A method for preparing a small-sized air intake structure. Firstly, a resin mixture with a curing agent is applied to a fiber-reinforced material by using a low-pressure contact molding process, and then the fiber-reinforced material is placed into the air-intake composite material parts. In the mold, the composite parts of the air intake main body, the upper skin, the middle skin and the lower skin are obtained through solidification molding and demoulding; then the air intake lip is prepared by machining, and then the upper skin and the upper skin are combined The middle skin is inserted into the lip of the air inlet and connected by blind rivets, and the middle skin and the lower skin are overlapped and aligned and then connected by blind rivets; finally, the main body of the air inlet is put into the lip of the air inlet Plate nuts and prefabricated screw holes on the lip are fixed to obtain a small-sized air intake structure, which is highly integrated, has strong skin rigidity, and can control structural deformation; at the same time, the number of structural parts and riveting can be effectively reduced, and the use of composite materials can meet complex requirements. The design requirements of the curved surface shape are suitable for the intake structure with complex shape and insufficient operating space.

Description

technical field [0001] The invention relates to the technical field of aircraft structure design, in particular to a method for preparing a small-sized air inlet structure. Background technique [0002] Aircraft engine inlets mainly have the following two functions: one is to ensure that the engine can work stably under various working conditions; the other is to compress the air entering the inlet, so that the kinetic energy of the airflow becomes pressure potential energy. For subsonic aircraft, the main function of the intake port is to ensure the stability of the airflow entering the engine. Due to the small aircraft (basic trainer, unmanned aerial vehicle), the volume of the aircraft is relatively small, so the outer dimension of the air inlet is also small. The airflow requirements of the airway require the arrangement of the inner skin, while the outer skin needs to meet the aerodynamic shape requirements of the aircraft. However, the stiffness of the skin is weak. I...

AI Technical Summary

Problems solved by technology

Due to the small aircraft (basic trainer, unmanned aerial vehicle), the volume of the aircraft is relatively small, so the size of the air inlet is also small. The airflow requirements of the airway require the arrangement of the inner skin, while the outer skin needs to meet the aerodynamic shape requirements of the aircraft. However, the stiffness of the skin is relatively weak. In order to meet the strength and stiffness requirements of the air intake structure, ribs must be used between the inner and outer skins There are many support and assembly connections, and a large operating space is required. This kind of air inlet has the disadvantages of a large number of parts, a large structural weight, complex assembly, not suitable for complex curved surface shapes, and requires a large space for riveting operations.

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