S-bend convergence and expansion spray pipe with cooling structure

Abstract

The invention discloses an S-bend convergence and expansion spray pipe with a cooling structure, and belongs to the field of aero-engines. The spray pipe comprises a convergence section, an expansion section and a gas film cooling structure, wherein the inlet of a first spray pipe section of the convergence section is an air inlet, and the outlet of a second spray pipe section is a spray pipe throat; the inlet of the expansion section sleeves the periphery of the spray pipe throat, overlapped parts exist along the axial direction, and an annular gap formed between the overlapped parts is an air film cooling slit; the air film cooling structure comprises an annular cooling air channel, a cooling channel support plate, an air film cooling hole and the air film cooling slit; and the outer wall face of a cooling channel is fixed to the periphery of the spray pipe in the circumferential direction through the cooling channel supporting plate, and the annular cooling air channel is formed. The air film cooling hole is formed in the outer wall surface of the convergence section; and cooling airflow flows into the spray pipe through the air film cooling hole and the air film cooling slit and covers the inner wall face of the high-temperature spray pipe. The problem that cooling gas is difficult to inject into the spray pipe due to shock wave interference of the expansion section is solved; and the problem of high infrared radiation generated by the wall surface of the high-temperature spray pipe and high-temperature tail jet air flow is solved.

Description

technical field [0001] The invention belongs to the field of aero-engines, and in particular relates to an S-curved nozzle expansion tube with a cooling structure. Background technique [0002] The continuous deepening of modern battlefield informatization and the rapid development of detection technology have greatly promoted the ability of weapons to detect enemies, posing a huge threat to fighter jets. Therefore, fighter jets urgently need to improve stealth performance. As an important part of the propulsion system, the exhaust nozzle of an aero-engine, the infrared radiation caused by its high-temperature wall and high-temperature gas has become the main detection object of infrared guided weapons, so measures need to be taken to reduce the infrared radiation of the exhaust nozzle. The S-curved nozzle can effectively suppress the infrared and radar signals of the exhaust system, so it is widely used in stealth fighters and drones. The requirements of the modern air 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 nozzle expansion tube with a cooling structure to at least solve the problem of structural deformation of the S-curved nozzle expansion tube in the prior art caused by high-temperature gas erosion, The shock wave interference in the expansion section makes it difficult for the cooling gas to inject into the nozzle, and the high infrared radiation generated by the high-temperature nozzle wall and high-temperature tail jet flow

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