Convergent-divergent nozzle with stealth function

Abstract

The invention relates to the design technique of aero-engine nozzles, in particular to a convergent-divergent nozzle with a stealth function, and aims to at least solve the problem of large occupation of a conventional convergent-divergent nozzle. The convergent-divergent nozzle with the stealth function comprises a convergent segment, a divergent segment and a straight tubular transition throat segment, wherein the end surface of a first inlet end of the convergent segment is circular, the end surface of a first outlet end, parallel to the end surface of the first inlet end, is semi-circular, and the centers of the two end surfaces are on the same plane; the end surface of a second inlet end of the divergent segment is semi-circular, the end surface of a second outlet end, parallel to the end surface of the second inlet end, is circular, and the centers of the two end surfaces are on the same plane; and the straight tubular transition throat segment is connected with the first outlet end in a sealing manner through a third inlet end and connected with the second inlet end in a sealing manner through a third outlet end. The convergent-divergent nozzle with the stealth function is simple in structure, light in weight, high in reliability and convenient to mount, manufacture and lose weight, and can enhance the infrared stealth effect and the radar stealth effect without changing the structure of a plane.

Description

technical field [0001] The invention relates to the design technology of an aeroengine nozzle, in particular to a retractable nozzle with a stealth function. Background technique [0002] The tail nozzle of the engine refers to the construction of the exhaust after the turbine or the afterburner; the function of the tail nozzle is mainly to make the gas after the turbine continue to expand, fully convert the remaining heat in the gas into kinetic energy, and make the gas Spray from the mouth of the basin at high speed. According to the different conditions of use, the engine tail nozzle can be divided into two types: convergent and convergent divergence according to the shape of the channel, and the nozzle area can be made adjustable or non-adjustable. [0003] At present, all supersonic engines use retractable nozzles, and their structures mainly include three parts: a subsonic convergent section, a throat, and a supersonic expansion section; performance requirements. ...

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Problems solved by technology

[0003] At present, all supersonic engines use retractable nozzles, and their structures mainly include three parts: a subsonic convergent section, a throat, and a supersonic expansion section; performance requirements

[0004] For this reason, an improvement was made on the basis of the retractable nozzle, and an S-curved nozzle appeared; however, the S-curved nozzle has a relatively large bend in the structure and takes up a large space, requiring a special reserved position for the aircraft. The overall structure has a great influence

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