Double-S-bend infrared stealth spray pipe structure capable of achieving multi-direction thrust vector control

Abstract

A double-S-bend infrared stealth spray pipe structure capable of achieving multi-direction thrust vector control is composed of a double-S-bend contraction spray pipe, a rectangular contraction-expansion spray pipe, an upper high-pressure secondary flow spray pipeline and adjusting device, a lower high-pressure secondary flow spray pipeline and adjusting device and a high-pressure secondary flow spray pipeline and adjusting device, the upper high-pressure secondary flow spray pipeline and adjusting device and the lower high-pressure secondary flow spray pipeline and adjusting device are arranged on the throat portion of the rectangular contraction-expansion spray pipe, the lower high-pressure secondary flow spray pipeline and adjusting device is arranged on the lower portion of an expansion segment of the rectangular contraction-expansion spray pipe, a thrust vector state and a non-thrust vector state exist in the normal work process, and a high-temperature turbine component is completely covered under the two states. Only all the high-pressure secondary spay pipelines need to be closed at the same time under the non-thrust vector state.

Description

Technical field: [0001] The invention relates to the technical field of aero-engines, in particular to a new engine exhaust system structure applied to high-mobility stealth unmanned fighter jets, specifically, it can realize integrated design with the rear fuselage of the aircraft body and multi-directional thrust vector control The double S-bend infrared stealth nozzle structure. Background technique: [0002] With the rapid development of advanced infrared guided missiles and airborne infrared search and track systems, modern unmanned fighter jets have higher and higher requirements for infrared stealth technology. Infrared stealth technology (also known as infrared low detectable technology) refers to reducing the infrared radiation signal characteristics of aircraft through cooling, coating, occlusion and other technologies, making it difficult for enemy infrared guided missiles and airborne infrared search and tracking systems to find, detect and track. The infrared ...

AI Technical Summary

Problems solved by technology

Binary nozzle technology means that the outlet form of the nozzle is a rectangular section, and the binary nozzle is easy to realize the thrust vector in the pitch direction, which is beneficial to the integrated design of the exhaust system and the fuselage; The strong three-dimensional effect strengthens the mixing of the tail jet and the external airflow; however, it cannot completely shield the internal high-temperature components, so its effect on reducing the infrared radiation characteristics of the exhaust system is limited

Considering the inherent disadvantages of the mechanical thrust vectoring nozzle: heavy weight of the nozzle, large number of moving parts in high temperature environment, high cooling requirements, poor stealth ability, low reliability, high cost, etc., more and more domestic and foreign The researchers began to explore a new type of thrust vectoring nozzle to replace the mechanical adjustment - pneumatic thrust vectoring nozzle, that is, through the secondary flow control, the direction of the main flow can be changed

However, the main feature of these types of fixed-geometry aerodynamic vector nozzles is that they can only achieve thrust vector control in one direction, that is, they can only perform pitch thrust vector control or yaw thrust vector control. To meet the requirements of vector control, to realize its flexibility and high maneuverability, and to enable it to work in a wider flight envelope, it is necessary to propose a thrust vector technology that can realize multi-directional vector control

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