S-shaped invisible spray pipe with cooling structure

Abstract

The invention discloses an S-shaped invisible spray pipe with a cooling structure, and belongs to the field of aero-engines. The S-shaped invisible spray pipe comprises an S-shaped bent spray pipe and an air film cooling and reinforcing device. The air film cooling and reinforcing device is arranged on the outer peripheral surface of the S-shaped bent spray pipe and comprises air film cooling holes, an annular reinforcing device, a cooling air supply device and a reinforcing support column. The annular reinforcing device is an annular cavity with an opening in the inner annular surface and coaxially sleeves the periphery of the S-shaped bent spray pipe, and the opening in the inner annular surface of the annular reinforcing device is attached and fixed to the outer wall surface of the S-shaped bent spray pipe. The air film cooling holes are formed in the wall of the S-shaped bent spray pipe in the annular reinforcing device. The outer annular surface of the annular reinforcing device is connected with an aircraft skin through the reinforcing support column. Cooling air enters the S-shaped bent spray pipe through the cooling air supply device, so that the injected cooling air flow covers the inner wall surface of the spray pipe, and the temperature of the wall surface of the S-shaped bent spray pipe and the infrared radiation of an exhaust system are reduced. Damage caused by the high temperature of the wall surface is prevented, meanwhile, the infrared radiation of the exhaust system can be reduced through the injected cooling airflow, and the hiding performance of the S-shaped bent spray pipe is enhanced.

Description

technical field [0001] The invention belongs to the field of aero-engines, and in particular relates to an S-curved stealth nozzle with a cooling structure. Background technique [0002] In today's war, turbojet fighters face threats from radar- and infrared-guided missiles. Therefore, while improving the maneuverability of fighter jets, it is necessary to improve the stealth performance of the aircraft. The exhaust system of a fighter jet has a high-temperature wall and discharges high-temperature gas, which provides the main radar radiation signal (RCS) and infrared radiation signal (IRS) on the aircraft. Therefore, measures should be taken to reduce the radar and infrared signals of the engine exhaust nozzle to enhance the survivability of fighter jets on the battlefield. The S-curved nozzle can excellently suppress the radar and infrared signals of the exhaust system, so it is widely used in stealth bombers and drones. First of all, the S-curved nozzle has a curved co...

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes an S-curved invisible nozzle with a cooling structure, which solves the problem of structural deformation of the S-curved nozzle in the prior art when it is subjected to a strong thermal load, and the problem of high-temperature nozzle The problem of high infrared radiation caused by the pipe wall and high temperature gas

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