S-shaped bent shrinking-expanding spray pipe structure

Abstract

The invention discloses an S-shaped bent shrinking-expanding spray pipe structure which comprises a shrinking section and an expanding section; the shrinking section is equipped with a gas inlet which is connected with a high-temperature turbine outlet of an engine; the expanding section is connected to the tail part of the shrinking section and is equipped with a gas outlet; and a spray pipe throat is formed on a transition part of the shrinking section and the expanding section. According to the S-shaped bent shrinking-expanding spray pipe structure which adopts the technical scheme, gas flow from the high-temperature turbine outlet of the engine is expanded and accelerated during shrinking and expanding, and is accelerated to sound speed at the spray pipe throat; and the gas flow which reaches sound speed is further accelerated to ultrasonic sound speed at the expanding section after passing through the spray pipe throat. The S-shaped bent shrinking-expanding spray pipe structure disclosed by the invention solves the problem that a shrinking type engine tail spray pipe adopted by a warplane in the prior art cannot meet the needs of covering infrasound speed flight, transonic sped flight and ultrasonic sound speed flight of the warplane.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to an S-bend diverter-spray nozzle structure. Background technique [0002] With the rapid development of advanced infrared guided missiles, airborne infrared search and track systems and radar guidance technology, modern fighters have higher and higher requirements for infrared stealth technology and radar stealth technology. The research shows that the S-bend nozzle has become the research focus of low detectability technology because of its obvious advantages as follows. On the one hand, the S-curved surface can effectively shield internal high-temperature components such as turbine guides and afterburner flame stabilizers, significantly reduce their infrared radiation, and enhance the radar stealth characteristics of the exhaust system; on the other hand, the use of S The curved channel makes the incident electromagnetic wave repeatedly refracted and consumed in the S-curved channel...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of S-curved retraction-spreading nozzle structure, to at least solve the problem that the retractable engine tail nozzle adopted by fighters in the prior art cannot meet the needs of fighters covering sub-, span- and supersonic flight

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