Three-duct S-shaped spray pipe with turbulent flow rib-air film cooling structure

Abstract

The invention discloses a three-duct S-shaped spray pipe with a turbulent flow rib-air film cooling structure, and belongs to the field of aero-engines. The three-duct S-shaped spray pipe comprises a convergence section, an expansion section, a third duct, the turbulent flow rib-air film cooling structure and a flow channel adjusting device. The turbulent flow rib-air film cooling structure comprises air film cooling holes and turbulent flow ribs, the multiple air film cooling holes are formed in the inner wall face, close to an annular outlet, of the expansion section and the outer wall face, at an exhaust port of the spray pipe, of the expansion section in the circumferential direction, and a plurality of annular protrusions are arranged on the outer wall face of the spray pipe along the center line and serve as the turbulent flow ribs; and the flow channel adjusting device comprises an adjustable spray pipe wall face and an actuating cylinder, the rotating position of a sheet structure is controlled through stretching and retracting of the actuating end, and then the radial sectional area of the annular outlet of the third duct is changed. The problems of damage caused by large thermal stress, high infrared radiation, deformation and flow control of the three-duct S-shaped spray pipe under different working conditions in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of aero-engines, and in particular relates to a three-channel S-curved nozzle with a spoiler rib-air film cooling structure. Background technique [0002] The variable cycle engine regulates the thermodynamic cycle characteristics of the engine by changing the position, geometric size and shape of the internal components of the engine. The adaptive cycle engine is the latest generation variable cycle engine with the most novel configuration. Multiple working modes. The adaptive cycle engine comprehensively utilizes the advantages of turbojet engine's high thrust-to-weight ratio, high altitude and high speed, and turbofan engine's low fuel consumption and long range, and can solve the power bottleneck problem encountered by the new generation of fighter jets. Therefore, it will be widely used in a new generation of fighter jets with the characteristics of supersonic penetration and subsonic long flight. At present, ...

AI Technical Summary

Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a three-channel S-curved nozzle with spoiler rib-film cooling structure, through which the The combination of the flow rib-film cooling structure and the flow channel adjustment device solves the problem of damage caused by the large thermal stress on the inner and outer walls of the three-duct S-bend nozzle in the prior art, and the high-temperature nozzle wall and the high-temperature tail gas. The problem of high infrared radiation, the deformation of the S-curved nozzle due to its large thin-walled structure, and the flow control problem of the three-channel S-curved nozzle under different working conditions

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