Low detectable integrated spray pipe suitable for adaptive engine

Abstract

The application belongs to the field of aeroengines, and particularly relates to a low detectable integrated spray pipe suitable for an adaptive engine. The low detectable integrated spray pipe comprises a special-shaped spray pipe main body and a third external culvert interface. The special-shaped spray pipe main body (1) comprises a convergent section, an adjustable throat (2) and an expansionsection which are sequentially connected, a cross section of the special-shaped spray pipe main body (1) is square and is provided with an S-shaped flow channel, the adjustable throat (2) is connectedwith a throat adjusting mechanism, and the throat adjusting mechanism can adjust the cross section size of the adjustable throat (2); and the third external culvert interface (3) is arranged on the expansion section, and the third external culvert interface (3) is connected to an outlet end of a third external culvert fan of the engine. According to the low detectable integrated spray pipe suitable for the adaptive engine, the compatibility of a third external culvert airflow with mainstream exhaust can be realized, the infrared radiation intensity of the spray pipe is reduced, the number ofparts that need to be adjusted is reduced, the highly integrated design of the engine and an aircraft rear body can be realized, and the rear body resistance is reduced.

Description

technical field [0001] The application belongs to the field of aero-engines, and in particular relates to a low-detectable integrated nozzle suitable for adaptive engines. Background technique [0002] Adaptive engine is a new concept of variable cycle engine, with the fifth-generation fighter high survivability, long-range flight, rapid penetration to reach the battlefield, long-term space and long-range combat capabilities, adaptive engine not only has the traditional vortex The high-pressure core machine and low-pressure outer duct of the fan engine will also add a third duct that can be opened and closed on the outer ring. The third duct can be opened during cruise and patrol standby, thereby increasing the bypass ratio and reducing fuel consumption. the flight range of the aircraft. The nozzle for the adaptive engine should meet the high stealth and high integration performance requirements of the fifth-generation fighter. Tri-external airflow for mainstream exhaust c...

AI Technical Summary

Problems solved by technology

[0003] The mainstream and external airflow of traditional turbofan engines are mixed at the inlet of the afterburner, and the nozzle is composed of a single channel, which cannot realize the mixing of the third external airflow and the mainstream, and the nozzles are mostly arranged along the circumferential or pitch direction. Adjustable mechanism to control the throat area of ​​the nozzle. This nozzle configuration, which can be adjusted in the circumferential or pitch direction, increases the complexity of the mixing of the third external airflow and the mainstream on the one hand, and increases the mass of the nozzle on the other hand.

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