Binary plug nozzle of turbofan engine with afterburning

Abstract

The invention relates to a binary plug nozzle of a turbofan engine with afterburning, and belongs to the field of suppressing an infrared radiation characteristic of an aircraft. The front part of the nozzle is provided with an external channel (14) and an internal channel (1), a central cone (12) is arranged in the internal channel (1) through a support plate (13), and a flame holder (3) is also arranged at the downstream of the central cone (12); the middle part of the nozzle is provided with an afterburning chamber, the rear part of the nozzle is sequentially provided with a transitional section (6) and a retracting and expanding section (7), and a tapered plug which is of a prism shape is arranged in the retracting and expanding section (7), and the tapered plug comprises a front part (10) of the tapered plug and a rear part (9) of the tapered plug. In the invention, while the pneumatic performance is maintained to be high, the infrared radiation characteristic of an engine exhaust emission system is remarkably reduced, and the tracking distance of an infrared detection system is shortened, so that the battlefield survival ability of the aircraft is effectively improved.

Description

technical field [0001] The patent of the present invention relates to the suppression of infrared radiation characteristics of aircraft, specifically, it mainly relates to the turbofan engine power exhaust system. Background technique [0002] With the development of modern military science and technology, various ground-air and air-to-air weapons and equipment are increasingly threatening aircraft, especially fighter jets that play the role of penetration tactics. The problem of how to improve the survivability of aircraft battlefields has become increasingly prominent. In view of the target signal characteristics of the aircraft itself, countries all over the world have developed advanced detection, search and tracking devices. At present, the vast majority of medium and short-range surface-to-air and air-to-air missiles use infrared and microwave radar composite guidance technology. Relevant data show that in several air battles since the 1980s, the number of aircraft sho...

AI Technical Summary

Problems solved by technology

However, there are three main problems in the use of the plug nozzle: first, the plug cone increases the flow resistance in the nozzle, changes the flow conditions in the nozzle, and has a certain impact on the aerodynamic performance of the nozzle; The weight of the nozzle will increase compared with the axisymmetric nozzle; the third is the cooling problem of the plug cone

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