Cooling channel structure suitable for two-dimensional invisible spray pipe

Abstract

The invention belongs to the technical field of aero-engines, and particularly relates to a cooling channel structure suitable for a two-dimensional invisible spray pipe. The cooling channel structurecomprises a round-to-square section, a convergence section and an expansion section which are sequentially connected, and a first cooling channel is formed between a first inner wall and a first outer wall of the round-to-square section; a second cooling channel is formed between a second inner wall and a second outer wall of the convergence section, the second cooling channel communicates with the first cooling channel, the second inner wall comprises a convergence section upper-layer heat shield and a convergence section lower-layer heat shield, a first through hole is formed in the convergence section upper-layer heat shield, and a second through hole is formed in the convergence section lower-layer heat shield; and a third cooling channel is formed between a third inner wall and a third outer wall of the expansion section, the third cooling channel communicates with the second cooling channel, and the third inner wall comprises an expansion section heat shield. According to the cooling channel structure, air flow of the cooling channel of the round-to-square section of the spray pipe can be reorganized and, the cold air amount between a side wall and an adjusting piece is reasonably distributed, and excessive cooling efficiency and insufficient cold air amount of the adjusting piece caused by inflow of a large amount of cold air are avoided.

Description

technical field [0001] The application belongs to the technical field of aero-engines, and in particular relates to a cooling passage structure suitable for a binary stealth nozzle. Background technique [0002] Binary stealth nozzles are generally used in military aircraft engines. The nozzle is located at the outlet of the afterburner. Under the afterburner state, the wall of the nozzle will face the scour of the high-temperature airflow at the outlet of the afterburner. The existing high-temperature resistant materials are not enough to withstand In the high-temperature and high-pressure environment at the exit of the afterburner, in the middle state, the nozzle expansion piece is completely exposed in the rear view direction, releasing a relatively high-intensity infrared radiation signal, so it is considered to deal with binary stealth in terms of material affordability and infrared stealth performance The nozzle adopts certain cooling measures to effectively reduce the...

AI Technical Summary

Problems solved by technology

Compared with the nozzle, the axial pressure difference between the main combustion chamber and the afterburner chamber is smaller, and the cooling scheme mostly adopts simple film cooling, but the airflow in the nozzle channel expands and accelerates in the nozzle, and changes from circular to The static pressure of the nozzle from the square section to the expansion section is greatly reduced. If a simple film cooling airflow is used to flow a large amount into the expansion section of the low-pressure area, backflow will occur in the circular to square section and the convergent section, resulting in serious unevenness in the cooling effect of the components. The local cooling efficiency is too high, and local reflow occurs, which will seriously cause wall ablation

Images